Herbicides
Plant Weeds
Lolium
Acetolactate Synthase
Aminobutyrates
Drug Resistance
Plants, Genetically Modified
Acetyl-CoA Carboxylase
Poaceae
Glycine
Tobacco
Atrazine
Genes, Dominant
2,4-Dichlorophenoxyacetic Acid
Mutation
Drug Resistance, Microbial
Drug Resistance, Bacterial
Mutations in an auxin receptor homolog AFB5 and in SGT1b confer resistance to synthetic picolinate auxins and not to 2,4-dichlorophenoxyacetic acid or indole-3-acetic acid in Arabidopsis. (1/64)
Although a wide range of structurally diverse small molecules can act as auxins, it is unclear whether all of these compounds act via the same mechanisms that have been characterized for 2,4-dichlorophenoxyacetic acid (2,4-D) and indole-3-acetic acid (IAA). To address this question, we used a novel member of the picolinate class of synthetic auxins that is structurally distinct from 2,4-D to screen for Arabidopsis (Arabidopsis thaliana) mutants that show chemically selective auxin resistance. We identified seven alleles at two distinct genetic loci that conferred significant resistance to picolinate auxins such as picloram, yet had minimal cross-resistance to 2,4-D or IAA. Double mutants had the same level and selectivity of resistance as single mutants. The sites of the mutations were identified by positional mapping as At4g11260 and At5g49980. At5g49980 is previously uncharacterized and encodes auxin signaling F-box protein 5, one of five homologs of TIR1 in the Arabidopsis genome. TIR1 is the recognition component of the Skp1-cullin-F-box complex associated with the ubiquitin-proteasome pathway involved in auxin signaling and has recently been shown to be a receptor for IAA and 2,4-D. At4g11260 encodes the tetratricopeptide protein SGT1b that has also been associated with Skp1-cullin-F-box-mediated ubiquitination in auxin signaling and other pathways. Complementation of mutant lines with their corresponding wild-type genes restored picolinate auxin sensitivity. These results show that chemical specificity in auxin signaling can be conferred by upstream components of the auxin response pathway. They also demonstrate the utility of genetic screens using structurally diverse chemistries to uncover novel pathway components. (+info)Molecular analysis, cytogenetics and fertility of introgression lines from transgenic wheat to Aegilops cylindrica host. (2/64)
Natural hybridization and backcrossing between Aegilops cylindrica and Triticum aestivum can lead to introgression of wheat DNA into the wild species. Hybrids between Ae. cylindrica and wheat lines bearing herbicide resistance (bar), reporter (gus), fungal disease resistance (kp4), and increased insect tolerance (gna) transgenes were produced by pollination of emasculated Ae. cylindrica plants. F1 hybrids were backcrossed to Ae. cylindrica under open-pollination conditions, and first backcrosses were selfed using pollen bags. Female fertility of F1 ranged from 0.03 to 0.6%. Eighteen percent of the sown BC1s germinated and flowered. Chromosome numbers ranged from 30 to 84 and several of the plants bore wheat-specific sequence-characterized amplified regions (SCARs) and the bar gene. Self fertility in two BC1 plants was 0.16 and 5.21%, and the others were completely self-sterile. Among 19 BC1S1 individuals one plant was transgenic, had 43 chromosomes, contained the bar gene, and survived glufosinate treatments. The other BC1S1 plants had between 28 and 31 chromosomes, and several of them carried SCARs specific to wheat A and D genomes. Fertility of these plants was higher under open-pollination conditions than by selfing and did not necessarily correlate with even or euploid chromosome number. Some individuals having supernumerary wheat chromosomes recovered full fertility. (+info)Effects of genetically modified herbicide-tolerant cropping systems on weed seedbanks in two years of following crops. (3/64)
The Farm Scale Evaluations (FSEs) showed that genetically modified herbicide-tolerant (GMHT) cropping systems could influence farmland biodiversity because of their effects on weed biomass and seed production. Recently published results for winter oilseed rape showed that a switch to GMHT crops significantly affected weed seedbanks for at least 2 years after the crops were sown, potentially causing longer-term effects on other taxa. Here, we seek evidence for similar medium-term effects on weed seedbanks following spring-sown GMHT crops, using newly available data from the FSEs. Weed seedbanks following GMHT maize were significantly higher than following conventional varieties for both the first and second years, while by contrast, seedbanks following GMHT spring oilseed rape were significantly lower over this period. Seedbanks following GMHT beet were smaller than following conventional crops in the first year after the crops had been sown, but this difference was much reduced by the second year for reasons that are not clear. These new data provide important empirical evidence for longer-term effects of GMHT cropping on farmland biodiversity. (+info)Transgenic oilseed rape along transportation routes and port of Vancouver in western Canada. (4/64)
The occurrence of transgenic herbicide-resistant oilseed rape (Brassica napus) in ruderal (non-crop disturbed) areas has not been investigated previously in Canada. The primary objective of this study was to document their occurrence in two main ruderal areas (along railways and roads) in the province of Saskatchewan, where half of all oilseed rape is grown, and at the port of Vancouver, British Columbia on the west coast of Canada, where most oilseed rape destined for export is transported by rail. During the 2005 growing season, leaf samples of oilseed rape plants were collected at randomly-selected sites along railways and roads across Saskatchewan ecoregions and at Vancouver; infestation area, density, and plant height of oilseed rape were measured at each site. The presence of the glyphosate and glufosinate resistance traits was determined using test strips. The infestation area of oilseed rape, averaged across 155 sampled sites in the Saskatchewan survey, was markedly smaller in populations along railways than roads; in contrast, infestation area averaged across 54 sites in the Vancouver survey was greater for populations along railways than roads. In both surveys, mean plant density was greater for populations found along railways than roads. Two-thirds of oilseed rape plants sampled across Saskatchewan ecoregions and at Vancouver were transgenic, although the relative proportion of plants with the glyphosate or glufosinate resistance trait varied between surveys. Frequency of occurrence of transgenic plants in ruderal areas was similar to the proportion of the oilseed rape area planted with transgenic cultivars in the recent preceding years. A single transgenic B. rapa x B. napus hybrid was found along a road in Vancouver, confirming the relatively high probability of hybridization between these two Brassica species. With current control measures, transgenic oilseed rape populations may persist and spread in these ruderal areas. (+info)Detection of feral transgenic oilseed rape with multiple-herbicide resistance in Japan. (5/64)
Repeated monitoring for escaped transgenic crop plants is sometimes necessary, especially in cases when the crop has not been approved for release into the environment. Transgenic oilseed rape (Brassica napus) was detected along roadsides in central Japan in a previous study. The goal of the current study was to monitor the distribution of transgenic oilseed rape and occurrence of hybridization of transgenic B. napus with feral populations of its closely related species (B. rapa and B. juncea) in the west of Japan in 2005. The progenies of 50 B. napus, 82 B. rapa and 283 B. juncea maternal plants from 95 sampling sites in seven port areas were screened for herbicide-resistance. Transgenic herbicide-resistant seeds were detected from 12 B. napus maternal plants growing at seven sampling sites in two port areas. A portion of the progeny from two transgenic B. napus plants had both glyphosate-resistance and glufosinate-resistance transgenes. Therefore, two types of transgenic B. napus plants are likely to have outcrossed with each other, since the double-herbicide-resistant transgenic strain of oilseed rape has not been developed intentionally for commercial purposes. As found in the previous study, no transgenic seeds were detected from B. rapa or B. juncea, and more extensive sampling is needed to determine whether introgression into these wild species has occurred. (+info)Single-site mutations in the carboxyltransferase domain of plastid acetyl-CoA carboxylase confer resistance to grass-specific herbicides. (6/64)
Grass weed populations resistant to aryloxyphenoxypropionate (APP) and cyclohexanedione herbicides that inhibit acetyl-CoA carboxylase (ACCase; EC 6.4.1.2) represent a major problem for sustainable agriculture. We investigated the molecular basis of resistance to ACCase-inhibiting herbicides for nine wild oat (Avena sterilis ssp. ludoviciana Durieu) populations from the northern grain-growing region of Australia. Five amino acid substitutions in plastid ACCase were correlated with herbicide resistance: Ile-1,781-Leu, Trp-1,999-Cys, Trp-2,027-Cys, Ile-2,041-Asn, and Asp-2,078-Gly (numbered according to the Alopecurus myosuroides plastid ACCase). An allele-specific PCR test was designed to determine the prevalence of these five mutations in wild oat populations suspected of harboring ACCase-related resistance with the result that, in most but not all cases, plant resistance was correlated with one (and only one) of the five mutations. We then showed, using a yeast gene-replacement system, that these single-site mutations also confer herbicide resistance to wheat plastid ACCase: Ile-1,781-Leu and Asp-2,078-Gly confer resistance to APPs and cyclohexanediones, Trp-2,027-Cys and Ile-2,041-Asn confer resistance to APPs, and Trp-1,999-Cys confers resistance only to fenoxaprop. These mutations are very likely to confer resistance to any grass weed species under selection imposed by the extensive agricultural use of the herbicides. (+info)Gene flow from GM glyphosate-tolerant to conventional soybeans under field conditions in Japan. (7/64)
Natural out-crossing rates were evaluated for conventional soybeans (Glycine max (L.) Merr.) cultivated adjacent to genetically modified (GM) glyphosate-tolerant soybeans under field conditions during a four-year period in Japan. A total of 107 846 progeny of 2772 plants harvested from conventional varieties were screened for glyphosate herbicide tolerance. The highest out-crossing rates, 0.19% in 2001 and 0.16% in 2002, were observed in adjacent rows 0.7 m from the pollen source. The highest rate in 2004 was 0.052%, which was observed at 2.1 m. No out-crossing was observed in the rows 10.5 m from the pollen source over the four-year period. The farthest distances between receptor and pollen source at which out-crossing was observed were 7 m in 2001, 2.8 m in 2002, and 3.5 m in 2004. The greatest airborne pollen density during the flowering period, determined by Durham pollen samplers located between the rows of each variety, was 0.368 grains.cm(-2).day(-1), with the average value at 0.18 grains.cm(-2).day(-1), indicating that the possibility of out-crossing by wind is minimal. Thrips species and predatory Hemiptera visited the soybean flowers more frequently during the four-year period than any other common pollinators, such as bees. (+info)Mycorrhizal and rhizobial colonization of genetically modified and conventional soybeans. (8/64)
We grew plants of nine soybean varieties, six of which were genetically modified to express transgenic cp4-epsps, in the presence of Bradyrhizobium japonicum and arbuscular mycorrhizal fungi. Mycorrhizal colonization and nodule abundance and mass differed among soybean varieties; however, in no case was variation significantly associated with the genetic modification. (+info)Herbicide resistance is a genetically acquired trait in weeds that allows them to survive and reproduce following exposure to doses of herbicides that would normally kill or inhibit the growth of susceptible plants. It is a result of natural selection where weed populations with genetic variability are exposed to herbicides, leading to the survival and reproduction of individuals with resistance traits. Over time, this can lead to an increase in the proportion of resistant individuals within the population, making it harder to control weeds using that particular herbicide or group of herbicides.
Herbicides are a type of pesticide used to control or kill unwanted plants, also known as weeds. They work by interfering with the growth processes of the plant, such as inhibiting photosynthesis, disrupting cell division, or preventing the plant from producing certain essential proteins.
Herbicides can be classified based on their mode of action, chemical composition, and the timing of their application. Some herbicides are selective, meaning they target specific types of weeds while leaving crops unharmed, while others are non-selective and will kill any plant they come into contact with.
It's important to use herbicides responsibly and according to the manufacturer's instructions, as they can have negative impacts on the environment and human health if not used properly.
I believe there may be a misunderstanding in your question. In the field of medicine, the term "weeds" is not typically used as a medical definition. The term "weeds" is commonly used to refer to unwanted plants that grow in a particular location, often in agricultural or gardening contexts.
If you are referring to plants that may have medicinal properties but are not typically cultivated and are instead found growing wild, they might be referred to as "wildcrafted herbs" or "weedy species," but there is no official medical definition for these terms either.
If you could provide more context or clarify your question, I would be happy to help further!
"Lolium" is not a term commonly used in medical definitions. It is actually the genus name for a group of plants that are more commonly known as ryegrasses. These plants belong to the family Poaceae and include several species that are widely used as pasture, hay, or lawn grasses.
While not directly related to human health, these plants can have indirect effects on health, particularly in agricultural settings. For example, certain ryegrass species can host a parasitic nematode called "Haemonchus contortus," which can infect and cause disease in livestock that graze on the grass.
However, without further context, it's challenging to provide a specific medical definition for "Lolium." If you have more information or if this term is being used in a specific medical context, please provide those details so I can give a more accurate response.
Acetolactate synthase (ALS), also known as acetohydroxyacid synthase (AHAS), is a key enzyme in the biosynthetic pathway of branched-chain amino acids (valine, leucine, and isoleucine) in bacteria, fungi, and plants. It catalyzes the first step in the pathway, which is the condensation of two molecules of pyruvate to form acetolactate.
Inhibitors of ALS, such as sulfonylureas and imidazolinones, are widely used as herbicides because they disrupt the biosynthesis of amino acids that are essential for plant growth and development. These inhibitors work by binding to the active site of the enzyme and preventing the substrate from accessing it.
In humans, ALS is not involved in the biosynthesis of branched-chain amino acids, but a homologous enzyme called dihydroorotate dehydrogenase (DHOD) plays a crucial role in the synthesis of pyrimidine nucleotides. Inhibitors of DHOD are used as immunosuppressants to treat autoimmune diseases, such as rheumatoid arthritis and multiple sclerosis.
'Echinochloa' is not a medical term, but rather a taxonomic genus name in the plant kingdom. It belongs to the family Poaceae and includes several species of annual grasses commonly known as barnyard grass or jointed grass. These plants are often considered weeds in agricultural settings. They have distinctively jointed stems and spike-like inflorescences, and some species can produce both sexual and asexual seeds.
While Echinochloa species may not have direct medical relevance, they can sometimes serve as hosts for crop pests or pathogens that might impact human health indirectly. For instance, certain grassy weeds like Echinochloa spp. can harbor and spread plant viruses, bacteria, or fungi that could potentially affect crops of agricultural importance. However, the medical definition of 'Echinochloa' is not applicable since it does not refer to a human disease, condition, or treatment.
Aminobutyrates are compounds that contain an amino group (-NH2) and a butyric acid group (-CH2-CH2-CH2-COOH). The most common aminobutyrate is gamma-aminobutyric acid (GABA), which is a major inhibitory neurotransmitter in the central nervous system. GABA plays a crucial role in regulating brain excitability and is involved in various physiological processes, including sleep, memory, and anxiety regulation. Abnormalities in GABAergic neurotransmission have been implicated in several neurological and psychiatric disorders, such as epilepsy, anxiety disorders, and chronic pain. Other aminobutyrates may also have important biological functions, but their roles are less well understood than that of GABA.
Drug resistance, also known as antimicrobial resistance, is the ability of a microorganism (such as bacteria, viruses, fungi, or parasites) to withstand the effects of a drug that was originally designed to inhibit or kill it. This occurs when the microorganism undergoes genetic changes that allow it to survive in the presence of the drug. As a result, the drug becomes less effective or even completely ineffective at treating infections caused by these resistant organisms.
Drug resistance can develop through various mechanisms, including mutations in the genes responsible for producing the target protein of the drug, alteration of the drug's target site, modification or destruction of the drug by enzymes produced by the microorganism, and active efflux of the drug from the cell.
The emergence and spread of drug-resistant microorganisms pose significant challenges in medical treatment, as they can lead to increased morbidity, mortality, and healthcare costs. The overuse and misuse of antimicrobial agents, as well as poor infection control practices, contribute to the development and dissemination of drug-resistant strains. To address this issue, it is crucial to promote prudent use of antimicrobials, enhance surveillance and monitoring of resistance patterns, invest in research and development of new antimicrobial agents, and strengthen infection prevention and control measures.
Genetically modified plants (GMPs) are plants that have had their DNA altered through genetic engineering techniques to exhibit desired traits. These modifications can be made to enhance certain characteristics such as increased resistance to pests, improved tolerance to environmental stresses like drought or salinity, or enhanced nutritional content. The process often involves introducing genes from other organisms, such as bacteria or viruses, into the plant's genome. Examples of GMPs include Bt cotton, which has a gene from the bacterium Bacillus thuringiensis that makes it resistant to certain pests, and golden rice, which is engineered to contain higher levels of beta-carotene, a precursor to vitamin A. It's important to note that genetically modified plants are subject to rigorous testing and regulation to ensure their safety for human consumption and environmental impact before they are approved for commercial use.
Acetyl-CoA carboxylase (ACCA) is a biotin-dependent enzyme that plays a crucial role in fatty acid synthesis. It catalyzes the conversion of acetyl-CoA to malonyl-CoA, which is the first and rate-limiting step in the synthesis of long-chain fatty acids. The reaction catalyzed by ACCA is as follows:
acetyl-CoA + HCO3- + ATP + 2H+ --> malonyl-CoA + CoA + ADP + Pi + 2H2O
ACCA exists in two isoforms, a cytosolic form (ACC1) and a mitochondrial form (ACC2). ACC1 is primarily involved in fatty acid synthesis, while ACC2 is responsible for the regulation of fatty acid oxidation. The activity of ACCA is regulated by several factors, including phosphorylation/dephosphorylation, allosteric regulation, and transcriptional regulation. Dysregulation of ACCA has been implicated in various metabolic disorders, such as obesity, insulin resistance, and non-alcoholic fatty liver disease.
Poaceae is not a medical term but a taxonomic category, specifically the family name for grasses. In a broader sense, you might be asking for a medical context where knowledge of this plant family could be relevant. For instance, certain members of the Poaceae family can cause allergies or negative reactions in some people.
In a medical definition, Poaceae would be defined as:
The family of monocotyledonous plants that includes grasses, bamboo, and sedges. These plants are characterized by narrow leaves with parallel veins, jointed stems (called "nodes" and "internodes"), and flowers arranged in spikelets. Some members of this family are important food sources for humans and animals, such as rice, wheat, corn, barley, oats, and sorghum. Other members can cause negative reactions, like skin irritation or allergies, due to their silica-based defense structures called phytoliths.
Glycine is a simple amino acid that plays a crucial role in the body. According to the medical definition, glycine is an essential component for the synthesis of proteins, peptides, and other biologically important compounds. It is also involved in various metabolic processes, such as the production of creatine, which supports muscle function, and the regulation of neurotransmitters, affecting nerve impulse transmission and brain function. Glycine can be found as a free form in the body and is also present in many dietary proteins.
Tobacco is not a medical term, but it refers to the leaves of the plant Nicotiana tabacum that are dried and fermented before being used in a variety of ways. Medically speaking, tobacco is often referred to in the context of its health effects. According to the World Health Organization (WHO), "tobacco" can also refer to any product prepared from the leaf of the tobacco plant for smoking, sucking, chewing or snuffing.
Tobacco use is a major risk factor for a number of diseases, including cancer, heart disease, stroke, lung disease, and various other medical conditions. The smoke produced by burning tobacco contains thousands of chemicals, many of which are toxic and can cause serious health problems. Nicotine, one of the primary active constituents in tobacco, is highly addictive and can lead to dependence.
Atrazine is a herbicide that is widely used to control broadleaf and grassy weeds in crops such as corn, sorghum, and sugarcane. It belongs to a class of chemicals called triazines. Atrazine works by inhibiting the photosynthesis process in plants, which ultimately leads to their death.
Here is the medical definition of Atrazine:
Atrazine: A selective systemic herbicide used for pre- and postemergence control of broadleaf weeds and grasses in corn, sorghum, sugarcane, and other crops. It acts by inhibiting photosynthesis in susceptible plants. Exposure to atrazine can occur through skin or eye contact, ingestion, or inhalation during its use or after its application. Short-term exposure to high levels of atrazine can cause irritation to the skin, eyes, and mucous membranes, while long-term exposure has been linked to reproductive effects in both humans and animals. It is classified as a possible human carcinogen by the International Agency for Research on Cancer (IARC).
Dominant genes refer to the alleles (versions of a gene) that are fully expressed in an individual's phenotype, even if only one copy of the gene is present. In dominant inheritance patterns, an individual needs only to receive one dominant allele from either parent to express the associated trait. This is in contrast to recessive genes, where both copies of the gene must be the recessive allele for the trait to be expressed. Dominant genes are represented by uppercase letters (e.g., 'A') and recessive genes by lowercase letters (e.g., 'a'). If an individual inherits one dominant allele (A) from either parent, they will express the dominant trait (A).
2,4-Dichlorophenoxyacetic acid (2,4-D) is a type of synthetic auxin, which is a plant growth regulator. It is a white crystalline powder with a sour taste and mild characteristic odor. It is soluble in water, alcohol, and acetone, and has a melting point of 130-140°C.
2,4-D is a widely used herbicide that is primarily used to control broadleaf weeds in a variety of settings, including agriculture, lawns, and golf courses. It works by mimicking the natural plant hormone auxin, which causes uncontrolled growth in susceptible plants leading to their death.
In medicine, 2,4-D has been used experimentally as a cytotoxic agent for the treatment of cancer, but its use is not widespread due to its toxicity and potential carcinogenicity. It is important to handle this chemical with care, as it can cause skin and eye irritation, and prolonged exposure can lead to more serious health effects.
A mutation is a permanent change in the DNA sequence of an organism's genome. Mutations can occur spontaneously or be caused by environmental factors such as exposure to radiation, chemicals, or viruses. They may have various effects on the organism, ranging from benign to harmful, depending on where they occur and whether they alter the function of essential proteins. In some cases, mutations can increase an individual's susceptibility to certain diseases or disorders, while in others, they may confer a survival advantage. Mutations are the driving force behind evolution, as they introduce new genetic variability into populations, which can then be acted upon by natural selection.
Microbial drug resistance is a significant medical issue that refers to the ability of microorganisms (such as bacteria, viruses, fungi, or parasites) to withstand or survive exposure to drugs or medications designed to kill them or limit their growth. This phenomenon has become a major global health concern, particularly in the context of bacterial infections, where it is also known as antibiotic resistance.
Drug resistance arises due to genetic changes in microorganisms that enable them to modify or bypass the effects of antimicrobial agents. These genetic alterations can be caused by mutations or the acquisition of resistance genes through horizontal gene transfer. The resistant microbes then replicate and multiply, forming populations that are increasingly difficult to eradicate with conventional treatments.
The consequences of drug-resistant infections include increased morbidity, mortality, healthcare costs, and the potential for widespread outbreaks. Factors contributing to the emergence and spread of microbial drug resistance include the overuse or misuse of antimicrobials, poor infection control practices, and inadequate surveillance systems.
To address this challenge, it is crucial to promote prudent antibiotic use, strengthen infection prevention and control measures, develop new antimicrobial agents, and invest in research to better understand the mechanisms underlying drug resistance.
Bacterial drug resistance is a type of antimicrobial resistance that occurs when bacteria evolve the ability to survive and reproduce in the presence of drugs (such as antibiotics) that would normally kill them or inhibit their growth. This can happen due to various mechanisms, including genetic mutations or the acquisition of resistance genes from other bacteria.
As a result, bacterial infections may become more difficult to treat, requiring higher doses of medication, alternative drugs, or longer treatment courses. In some cases, drug-resistant infections can lead to serious health complications, increased healthcare costs, and higher mortality rates.
Examples of bacterial drug resistance include methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococci (VRE), and multidrug-resistant tuberculosis (MDR-TB). Preventing the spread of bacterial drug resistance is crucial for maintaining effective treatments for infectious diseases.
2-Methyl-4-chlorophenoxyacetic acid is a synthetic auxin, which is a type of plant hormone. It is often used as a herbicide to control broadleaf weeds in crops such as corn and wheat. It works by causing uncontrolled growth in the targeted plants, ultimately leading to their death. It is important to note that this compound is not typically used in human medicine.
Drug resistance in neoplasms (also known as cancer drug resistance) refers to the ability of cancer cells to withstand the effects of chemotherapeutic agents or medications designed to kill or inhibit the growth of cancer cells. This can occur due to various mechanisms, including changes in the cancer cell's genetic makeup, alterations in drug targets, increased activity of drug efflux pumps, and activation of survival pathways.
Drug resistance can be intrinsic (present at the beginning of treatment) or acquired (developed during the course of treatment). It is a significant challenge in cancer therapy as it often leads to reduced treatment effectiveness, disease progression, and poor patient outcomes. Strategies to overcome drug resistance include the use of combination therapies, development of new drugs that target different mechanisms, and personalized medicine approaches that consider individual patient and tumor characteristics.
List of herbicides
Herbicide
Glyphosate-based herbicides
Sethoxydim
Pesticide resistance
Quinclorac
Avena sterilis
Jonathan Gressel
Mode of action
CropLife International
Chlorsulfuron
Tribenuron
Weed control
Fluazifop
Mesotrione
Glyphosate
Mendel Biotechnology
Daniel Chamovitz
Commercial sorghum
Evolutionary rescue
Genetically modified crops
Recombinant DNA
Evolutionary toxicology
Amaranthus palmeri
Shikimic acid
Biomolecular engineering
EPSP synthase
Fomesafen
Genetically modified soybean
Genetically modified organism
Top strategies to combat herbicide resistance
Common Herbicides Linked to Antibiotic Resistance - eNews Park Forest
Herbicide Resistance - RealAgriculture
PRIME PubMed | Laboratory investigation into the development of resistance of Daphnia magna to the herbicide molinate
Herbicide Resistance Predates GM Crops, Says Weed Scientists- Crop Biotech Update (July 20, 2016) | Crop Biotech Update - ISAAA...
News - Herbicide Resistance Conference
EPA OIG Will Evaluate EPA's Management of Resistance Issues Related to Herbicide Tolerant GE Crops - Bergeson & Campbell, P.C.
Multiple resistance game changer for herbicide tolerant crops - Grain Central
Herbicide Resistance
List of herbicides - Wikipedia
Herbicide Resistance | Profiles RNS
Testing Methods of Herbicide Resistance | Precision
Resistance Surveys
December 2016 - Australian Herbicide Resistance Initiative (AHRI)
Farmer experience with weed resistance to herbicides in cotton production<...
HERBICIDE RESISTANCE ACTION COMMITTEE (HRAC) | Tarımsal Danışmanlık Hizmetleri
Herbicide-resistant Echinochloa oryzoides and E. phyllopogon in California Oryza sativa fields
Plant Clinic Screening Waterhemp for Herbicide Resistance this Season - farmdoc
A waterhemp (Amaranthus tuberculatus) biotype with multiple resistance across three herbicide sites of action<...
herbicide Archives - Science Media Centre
Episode 132: The Wicked Problem of Herbicide Weed Resistance - WA Grains
India Together: Too risky to tolerate - 24 July 2009
News - Grapes
Plant Research (Biology & Medicine) | Max-Planck-Gesellschaft
Resistance to the herbicide 2,4-D is complex in wild radish
Significant increase of weed resistance to herbicides in Poland
HERBICIDE LAYERING IS A WAY TO REDUCE YOUR RESISTANCE RISK. | FMC Pre-School
Resistance profile of herbicide-resistant Alopecurus myosuroides (black-grass) populations in Denmark : Rothamsted Research
Herbicide Resistance: Development and Management | New Mexico State University - BE BOLD. Shape the Future.
A rapid test for ALS herbicide resistance in black-grass (Alopecurus myosuroides) : Rothamsted Research
Weeds46
- Weeds most often develop resistance in response to such repeated and exclusive exposure, which renders the herbicide ineffective over time. (farmprogress.com)
- The Weed Science Society of America (WSSA) has announced its Board has endorsed a series of best management practices designed to reduce the incidence of herbicide-resistant weeds and the threat they pose to agricultural productivity. (farmprogress.com)
- The best management practices recommended by WSSA to combat herbicide resistance include common-sense, diversified approaches to weed management - from proactive steps to reduce the number of weed seeds in the soil to the use of well-established cultural practices to suppress weeds through crop competition. (farmprogress.com)
- A short-term focus on less expensive approaches to weed control tends to prevail over concerns for the future economic toll of herbicide-resistant weeds. (farmprogress.com)
- According to a WSSA press release, while 2016 marks only the 20th anniversary of glyphosate resistant crops, 2017 will mark the 60th anniversary of the first reported herbicide resistant weeds. (isaaa.org)
- Since then, 250 species of weeds have evolved resistance to 160 different herbicides that span 23 of the 26 known herbicide mechanisms of action, and they are found in 86 crops in 66 countries. (isaaa.org)
- It was only a matter of time before PPO (Group G) resistance was also widespread in weeds like Palmer amaranth. (graincentral.com)
- Herbicide resistance is becoming an increasing problem in UK agriculture, in both grass weeds and broad-leaf weeds . (farmpep.net)
- Herbicide resistance tests are key to confirm resistance and help future management of resistant weeds by choosing the correct chemistry. (farmpep.net)
- These can be done by collecting seed from suspected resistant weeds and sending to ADAS who will test the seed for its resistance status. (farmpep.net)
- Herbicide resistant weeds can be reported to the International Herbicide-Resistant Weed Database . (farmpep.net)
- The herbicide resistance survey assesses the state of herbicide resistance to commonly used herbicides in the Western Australian wheatbelt for important weeds. (edu.au)
- Surveys were conducted over the last 20 years to determine the frequency and extent of herbicide resistance in crop weeds. (edu.au)
- A mail survey of 2,500 potential cotton farmers in 13 southern cotton-producing states was conducted in 2012 to assess the temporal and geographic extent of weed resistance to herbicides in cotton production, appraise changes in production practices after the emergence of herbicide-resistant weeds, evaluate the effectiveness of those changes in managing resistant weeds, and ascertain the influence of herbicide-resistant weeds on cotton weed-control costs. (elsevierpure.com)
- Over two-thirds of the farmers surveyed reported herbicide-resistant weeds on their farms. (elsevierpure.com)
- The proportion of farmers in the sample who indicated they had total weed control costs of $50 or more per acre nearly doubled with the emergence of herbicide-resistant weeds on their farm. (elsevierpure.com)
- Herbicide tolerant (HT) crops are genetically engineered crops which contain genes that allow them to resist the application of herbicides - the chemicals that kill weeds as well as all other plants except the ones that are genetically engineered. (indiatogether.org)
- Controlling weeds by using chemicals like herbicides becomes necessary in the large-landholding, labour starved agricultural conditions in industrial countries. (indiatogether.org)
- Between 2004 and 2017, multiple studies on the herbicide resistance of weeds were conducted by the Institute of Plant Protection - National Research Institute in Poland. (plantprotection.pl)
- Problem odporności chwastów na herbicydy w Polsce [Weeds resistance problem in Poland]. (plantprotection.pl)
- The idea behind layering is to use multiple herbicide groups and actives at different application timings to control the same resistance-prone weeds in the same fields. (fmcpreschool.com)
- Once activated by rain or moisture, pre-emergent herbicides create a protective "barrier" within the top layer of soil that controls weeds as they germinate. (fmcpreschool.com)
- Traditional Group 2 products can still fit in other areas of a grower's herbicide program, as they control perennial weeds, like narrow-leaved hawk's-beard and dandelions, where there are few herbicide options. (fmcpreschool.com)
- This is where layering in pre-emergent herbicides can help provide a valuable first line of defense on those resistant weeds. (fmcpreschool.com)
- Ideally, you've got newer modes of action in your pre-emergent herbicides controlling the resistant weeds and the traditional Group 2s working on weeds like hawk's-beard and dandelion," he says. (fmcpreschool.com)
- Alopecurus myosuroides Huds is one of the most important grass-weeds in North-western Europe and is also the most important herbicide-resistant weed species in European agricultural systems. (rothamsted.ac.uk)
- Considering the widespread usage of glyphosate in the region (e.g., orchards, vineyards, industrial situations, and glyphosate-resistant crops [Roundup Ready crops]), the development of glyphosate resistance in prolific weeds such as Palmer amaranth is a threat to the future use of this important herbicide in agriculture. (nmsu.edu)
- The development of herbicide resistance in weeds is an evolutionary process. (nmsu.edu)
- But over time, weeds can develop resistance to herbicides, which is why it's important to take a proactive, conscious approach to herbicide use. (collegefundlandscaping.com)
- This helps cover the resistance certain weeds have developed to specific inhibitors. (collegefundlandscaping.com)
- 1. We rotate herbicide with different modes of action as much as possible so that weeds don't acclimate to the herbicides and become resistant. (collegefundlandscaping.com)
- Visual inspection is an easy way to observe if the weeds on your property have developed herbicide resistance. (collegefundlandscaping.com)
- Despite the widespread adoption and use of herbicides, weeds still persist in agricultural and horticultural systems. (wsu.edu)
- Weeds can escape chemical control for numerous reasons, including: incorrect herbicide or rate selection, improper sprayer calibration, clogged nozzles or otherwise malfunctioning equipment, weed size (e.g. too large for control), herbicide applications that are made under less-than-ideal environmental conditions (e.g. too cold, too windy, too wet or too dry), and the development of herbicide resistance in weed species. (wsu.edu)
- Since these initial findings, the occurrence of herbicide-resistant weeds has increased, significantly. (wsu.edu)
- List of herbicide-resistant weeds in the state of Washington, year confirmed, and herbicide site of action (WSSA group). (wsu.edu)
- Because of various regulations and biological realities, a smaller number of herbicide MOAs can be used on any given crop and the suite of weeds that goes along with it. (eurekalert.org)
- In some areas, we're one or two MOAs away from completely losing chemical control of waterhemp and other multiple-herbicide-resistant weeds," says Adam Davis , head of the Department of Crop Sciences at Illinois and co-author on the study. (eurekalert.org)
- Research indicates that GM crop technology can result in a net increase in herbicide use and can foster the growth of herbicide resistant weeds. (montana.edu)
- Are Weeds in Your Fields Herbicide-resistant? (corteva.us)
- An important question to ask yourself when this happens is: "Did something go wrong with my weed control program or are the weeds I'm seeing herbicide resistant? (corteva.us)
- Backscheider says there are several reasons weeds will develop resistance to herbicides. (corteva.us)
- If it's been too dry, maybe your residual herbicide didn't get activated and weeds emerged sooner than they should have. (corteva.us)
- She says resistance will be evident when you have the right environmental conditions with an effective and timely herbicide program and yet you still do not control the weeds. (corteva.us)
- Backscheider says you also can have certain weeds tested to see if they're resistant to certain herbicides. (corteva.us)
- Resistance to the imidazolinone herbicides, imazethapyr and imazamox, found in a population of wild sunflower, could have great value for controlling many broadleaf weeds. (usda.gov)
Crops24
- Herbicide resistance has been blamed to glyphosate use in genetically engineered crops. (isaaa.org)
- However, the Weed Science Society of America (WSSA) reports that herbicide resistance predates genetically engineered crops by 40 years. (isaaa.org)
- On March 25, 2016, the U.S. Environmental Protection Agency's (EPA) Office of Inspector General (OIG) sent a memorandum to Jim Jones, Assistant Administrator, Office of Chemical Safety and Pollution Prevention (OCSPP), announcing that it plans to begin preliminary research to assess EPA's management and oversight of resistance issues related to herbicide tolerant genetically engineered (GE) crops. (lawbc.com)
- This "investigation" may appear to some to be a response to concerns raised by critics of GE crops generally and to a recent EPA decision to approve Enlist Duo herbicide, a new formulation of 2,4,D- and glyphosate designed to address the problem of weed resistance to glyphosate-tolerant crops. (lawbc.com)
- Glyphosate tolerant crops were first approved some years ago, and their use was so broadly and readily adopted that issues have arisen with regard to potential resistance to some weed species. (lawbc.com)
- To critics of GE crops, using more herbicides to control problems caused by what they claim is overuse of another herbicide is evidence of a troubling "pesticide treadmill," which they believe should not have been allowed to occur in the first place. (lawbc.com)
- University of Arkansas professor of weed science, Jason Norsworthy, says many growers in the US are now only one or two herbicides away from having no herbicide control options for Palmer amaranth (pigweed) in either conventional or herbicide tolerant soybean crops. (graincentral.com)
- Dr Norsworthy said many growers in the States were now only one or two herbicides away from having no herbicide control options for Palmer amaranth in either conventional or herbicide tolerant soybean crops. (graincentral.com)
- PPOs are currently being applied both at planting and in-crop in soybean crops where there are few other herbicide options," he said. (graincentral.com)
- Dr Norsworthy suggests Australian growers continue to adopt diverse weed management practices, including harvest weed seed control, competitive crops, strategic tillage and pasture phases rather than over-relying on herbicide tolerant hybrids as they come available. (graincentral.com)
- This resource provides details of all reported cases, the weed species, in which crops and to which herbicide group. (farmpep.net)
- The introduction of herbicide tolerant crops with accompanying herbicide use would kill the surrounding vegetation and deprive rural communities of the medicinal plants which form the basis of indigenous healing traditions. (indiatogether.org)
- Apart from this, using herbicide tolerant crops would make it impossible to plant crops on the fields' borders and the raised bunds, as is done in many parts of India and Asia for additional food and for increasing farm incomes. (indiatogether.org)
- In addition, resistance of wild oat (Avena fatua L.) to acetyl CoA carboxylase inhibitors occurred in 10 spring cereal crops. (plantprotection.pl)
- With limited herbicide options in pulse crops, resistance management is particularly important. (farms.com)
- Across all crops, there are 12 unique cases (weed species x site of action) of herbicide resistance in Washington state (Table 1). (wsu.edu)
- Six instances of glyphosate (WSSA Group 9) resistance have been confirmed in tree and vine crops in California and Oregon: annual bluegrass ( Poa annua ), junglerice ( Echinochloa colona ), horseweed/marestail ( Conyza canadensis ), hairy fleabane ( Conyza bonariensis ), Italian ryegrass ( Lolium perenne ), and rigid ryegrass ( Lolium rigidum ). (wsu.edu)
- 1 The main traits conferred to these crops through this technology are insect resistance (GM IR) and herbicide tolerance (GM HT). (montana.edu)
- Perhaps the most conflicting research surrounding GM crops concerns their effects on herbicide use and the subsequent environmental impact. (montana.edu)
- Some countries have experienced a net decrease in herbicide use associated with the adoption of GM crops. (montana.edu)
- However, in other countries, the average amount of herbicide active ingredient applied to GM crops compared to their conventional equivalent represents a net increase. (montana.edu)
- As a result, the comparison of herbicides used on GM crops versus conventional crops must include more than net amount used to determine overall environmental impact. (montana.edu)
- Significantly, the EIQ values of herbicides frequently used on GM crops are commonly better than those used on the conventional equivalent. (montana.edu)
- For example, even though there was a 1.7% increase in the amount of herbicide used on GM HT soybean crops in Brazil from 1996 - 2018, the EIQ values over the same time period represent a 7.2% improvement compared to the conventional improvement. (montana.edu)
Soybean6
- In the United States, herbicide tolerant varieties and hybrids have come to dominate in the sown areas of cotton (89pc), soybean (94pc) and corn (89pc) across all regions. (graincentral.com)
- Australian Herbicide Resistance Initiative (AHRI) director, Stephen Powles in a soybean trial plot in America overwhelmed with herbicide resistant Palmer amaranth (pigweed), a prime candidate for harvest weed seed control. (graincentral.com)
- Furthermore, this research identifies a significant reduction in the number of POST herbicide options available for waterhemp control in soybean production. (illinois.edu)
- image: Aaron Hager stands in a soybean field infested with multiple-herbicide-resistant waterhemp, a superweed becoming harder and harder to kill. (eurekalert.org)
- For example, from 2007 - 2014, GM HT soybean crop use in Brazil resulted in an average increase of 4,940,262 kilograms (kg) of herbicide. (montana.edu)
- The PAT encoding gene (bar) was introduced into the soybean genome by micro-particle acceleration (biolistic) transformation, and the resulting soybean lines displayed field tolerance to phosphinothricin-containing herbicides, thereby permitting farmers to use this herbicide for weed control in soybean cultivation. (cbd.int)
Populations19
- U of I Plant Clinic is offering molecular screening of waterhemp populations for resistance to glyphosate and PPO inhibitor herbicides this growing season. (illinois.edu)
- Herbicide-resistant waterhemp populations continue to expand into more areas of Illinois each season. (illinois.edu)
- Not every individual waterhemp plant is resistant to one or more herbicides, but the majority of field-level waterhemp populations contain one or more types of herbicide resistance. (illinois.edu)
- Resistance to the herbicide is increasing in a range of weed species and has evolved in populations of wild radish (Raphanus raphanistrum), a major weed in southern Australia and other regions with a Mediterranean-type climate. (botany.one)
- The results of this study suggest, the authors write, "that the resistant populations are less receptive to the presence of these herbicides at the plasma membrane, but this hypothesis needs to be tested. (botany.one)
- the high level of genetic diversity within and between wild radish populations, as well as the finding that genes and proteins of interest in one population seem to be less important in others , is leading researchers to the conclusion that each population may rely on a slightly different resistance mechanism. (botany.one)
- It is likely that auxinic herbicide resistance in wild radish is mediated by multiple processes that may be present in different proportions in different populations or even between individuals within a population," the authors write. (botany.one)
- This herbicide barrier can help cut back resistant weed populations right out of the gate. (fmcpreschool.com)
- The resistance pattern of 28 out of the 53 populations was investigated to four herbicides using a seed bioassay technique. (rothamsted.ac.uk)
- The seed bioassay results showed that all populations had varying degrees of resistance to fenoxaprop-P. In contrast, all populations were susceptible to cycloxydim suggesting that non-target site resistance (NTSR) was present in all populations including the ones where TSR were found. (rothamsted.ac.uk)
- Therefore, the widespread evolution of herbicide resistance in weed populations within intensive crop production systems is a major threat to the sustainability and profitability of cropping systems. (nmsu.edu)
- Global resistance evolution to major herbicides in barnyard grass populations threatens the sustainability of herbicide technology and, thus, of rice production. (nature.com)
- In that test, four waterhemp populations - three with resistance to multiple herbicides and one that is sensitive to all herbicides - were dosed with increasing levels of S-metolachlor, acetochlor, dimethenamid-P, and pyroxasulfone. (eurekalert.org)
- Populations from Champaign County and McLean County survived higher levels of the Group 15 herbicides than the other populations. (eurekalert.org)
- Segregation ratios of plants in F2 and testcross populations indicated that resistance was controlled by two genes, a major gene having a semi-dominant type of gene action (Imr1), and a second gene (Imr2) with a modifier effect when the major gene is present. (usda.gov)
- Herbicides did not induce any changes in the proteolytic activities in the populations with target-site resistance, indicating that this effect was only induced in sensitive plants. (bvsalud.org)
- The resistance index of the population (R-Q) was 183 times of the sensitive population (S-N). The resistant and sensitive populations were used as experimental materials in the paper. (bvsalud.org)
- Strand-specific RNA-Seq analyses of Râ Q and Sâ N populations obtained from herbicide-treated and mock-treated leaf samples after treatment were conducted to generate a full-length transcriptome database. (bvsalud.org)
- We analyzed differentially expressed genes (DEGs) among the R-Q and Sâ N A. retroflexus populations treated with recommended dose and mock-treated on the 1st (24 h) and 3rd (72 h) days to identify genes involved in fomesafen resistance. (bvsalud.org)
Species14
- Symptoms of herbicide resistance to look out for include: healthy plants beside dead plants of the same species, a susceptible species having poor control when other susceptible species are well controlled, discrete weed patches and a general decline over a number of years. (farmpep.net)
- Either pot tests or petri dish tests can be done depending on the weed species and types of herbicide to be tested. (farmpep.net)
- More than 200 plant species worldwide are resistant to herbicides. (agwired.com)
- There are basic steps in testing, but details may vary depending on the herbicide mechanism of action, weed species, and timing of application. (agwired.com)
- Waterhemp has evolved resistance to herbicides encompassing more mechanisms of action than any other Illinois weed species. (illinois.edu)
- To date, resistance to 23 classes of herbicides has been reported in 484 biotypes of 254 species (158 dicots, 96 monocots) worldwide (Heap, 2017). (nmsu.edu)
- To date, 39 prominent weed species have developed resistance to glyphosate worldwide. (nmsu.edu)
- In the United States, 17 weed species have developed resistance to herbicides. (nmsu.edu)
- The weed species appears to be healthy, even thriving, after herbicide treatment. (collegefundlandscaping.com)
- Previous attempts to control the particular species, using the same herbicide or herbicides with the same site of action/mode of action, have failed or performed poorly. (collegefundlandscaping.com)
- Compared to other common grass-weed species, such as black-grass and Italian rye-grass, the rate of selection and spread of herbicide resistance in wild oats has been relatively slow. (ahdb.org.uk)
- To date, more than 250 plant species, worldwide, have developed resistances to one or more herbicide sites of action ( http://weedscience.org ). (wsu.edu)
- Repeated use of a single product or herbicide group over space and time can lead to shifts in weed communities in which species tolerant or resistant to those products become dominant. (wsu.edu)
- Some weed species will be more likely to develop resistance due to the characteristics of that weed," Backscheider says. (corteva.us)
Crop7
- however, there are not as many herbicide tolerant crop options. (graincentral.com)
- The industry-sponsored Herbicide Resistance Action Committee (HRAC) advises on the use of herbicides in crop protection and classifies the available compounds according to their chemical structures and mechanism of action so as to manage the risks of pesticide resistance developing. (wikipedia.org)
- This advantage would be lost if the package of herbicide tolerant crop varieties and tailored herbicides would be implemented. (indiatogether.org)
- You may start with a pre-seed application of multiple herbicide groups before following up in-crop with a completely different set of groups. (fmcpreschool.com)
- He adds that the pre-emergent herbicide does a lot of the heavy lifting up-front, which allows your in-crop herbicide to be more effective and reduces the chance of more resistance issues cropping up. (fmcpreschool.com)
- We adapted protocols developed by Dr. Tranel's lab in the Dept. of Crop Sciences to transition the molecular protocols for glyphosate and for PPO Inhibitor resistance from a research laboratory to a service lab offering. (illinois.edu)
- This comparison stresses the importance of examining the aggregate impact of herbicide use over the entire time span of GM crop use. (montana.edu)
20162
- Based on a compilation of data in 2016 from most organisations/companies testing for herbicide resistance in the UK. (ahdb.org.uk)
- In fiscal years 2016 through 2021, more than $52 million was awarded through the BAA to fight antimicrobial resistance. (cdc.gov)
Glyphosate and PPO inhibitor2
- Waterhemp glyphosate and PPO inhibitor resistance testing was offered by the Plant Clinic for the first time in 2015. (illinois.edu)
- There is a $50 fee for the testing, which includes both the glyphosate and PPO-inhibitor resistance tests. (illinois.edu)
Antibiotic resistance8
- Last week, following the World Health Organization's (WHO) declaration that glyphosate is carcinogenic to humans based on animal studies, a new study was published in the American Society of Microbiology's journal, mBio, linking glyphosate, 2,4-D and dicamba to antibiotic resistance after testing the sub-lethal effects of these pesticides in certain bacteria. (enewspf.com)
- These results do have serious implications for public health, given the worldwide crisis of antibiotic resistance. (enewspf.com)
- We also know that it is not just the residues of the chemicals, but also the residues of antibiotic-resistant bacteria to which people are exposed that affects the development of antibiotic resistance in bacteria in the gut of people. (enewspf.com)
- Moreover, the generalized mode of action discovered in this study suggests an impact that might be produced by many different toxic chemicals, and therefore the possibility that spraying any pesticide could be increasing antibiotic resistance requires further be investigated. (enewspf.com)
- Studies have shown that even low concentrations of antibiotics in the environment may trigger antibiotic resistance and should therefore be taken to ensure that as little as possible end up in our environment. (janusinfo.se)
- N. gonorrhoeae has quickly developed resistance to each recommended treatment over time and gonorrhea is classified as an Urgent Threat in CDC's 2019 Antibiotic Resistance Threats Report. (cdc.gov)
- The CDC International Antibiotic-Resistant Gonorrhea Isolate Bank will provide complementary data to CDC's domestic specimens available through the Antibiotic Resistance Laboratory Network. (cdc.gov)
- ICAP at Columbia University is being funded to develop a network of four hospitals in Kenya to improve their ability to detect bacterial infections, determine antibiotic resistance in the infections, assess antibiotic use and the prevalence of healthcare-acquired infections, and develop an antibiotic stewardship collaborative to improve the use of antimicrobials at the hospitals. (cdc.gov)
Inhibitor1
- 2015 Counties with waterhemp samples testing positive for PPO inhibitor or glyphosate resistance, University of Illinois Plant Clinic. (illinois.edu)
Inhibitors8
- For example plants with an enhanced metabolism resistance mechanism may detoxify both Group 1 (ACCase inhibitors) and Group 2 (ALS inhibitors) herbicides, or a weed with a target site resistance mechanism may cause resistance to other herbicides that have the same MOA, even if that herbicide has not been used on the weed. (farmpep.net)
- The majority of herbicide resistance cases are to ALS and ACCase inhibitors. (farmpep.net)
- Question 2: Do you test for all mechanisms for resistance to glyphosate and PPO inhibitors? (illinois.edu)
- A population of waterhemp was identified in Adams County, Illinois, that survived treatment of several acetolactate synthase (ALS) inhibitors and a postemergence (POST) application of lactofen, a protoporphyrinogen oxidase (PPO)-inhibiting herbicide. (illinois.edu)
- Greenhouse studies were conducted to quantify the responses of this waterhemp population, designated ACR, to multiple PPO inhibitors and various other herbicides with different sites of action. (illinois.edu)
- Resistance to acetyl CoA carboxylase (ACCase) inhibitors was found in 18 fields, whereas resistance to photosystem II (PSII) inhibitors (isoproturon) was found in 12 fields. (plantprotection.pl)
- Cross resistance and/or multiple resistance is common within the ALS inhibitors because it is the largest mode of action group. (nmsu.edu)
- Palmer amaranth ( Amaranthus palmeri ) has developed a resistance to aromatic amino acid synthesis inhibitors in New Mexico. (nmsu.edu)
Farmers3
- From Australia to the United States to Canada, herbicide resistance has farmers around the world wondering about best management strategies. (realagriculture.com)
- Scott Yates, director of communications and producer relations for the Washington Grain Commission, continues his conversation with WSU weed scientists Ian Burke and Drew Lyon, focusing more broadly on the issue of weed resistance, what farmers can do to combat it in the present and what they may be looking at in the future. (wagrains.org)
- Hager says farmers might not notice the poor performance of these soil-applied pre-emergence herbicides because waterhemp germinates continuously throughout the season. (eurekalert.org)
Imidazolinone herbicides1
- To use low doses of imidazolinone herbicides for controlling thisparasite, maize cultivars should possess resistance to this group ofherbicides as they kill both maize and S. hermonthica. (iita.org)
Active ingredient1
- Cross-resistance: a single mechanism in the weed that confers resistance to more than one herbicide active ingredient. (farmpep.net)
Agriculture4
- A strain of antibiotic-resistant soil bacteria may seem innocuous to humans, but the documented fact that its resistance can be transferred into human bacterial strains reveals that the use of antibiotics in agriculture can have disastrous and deadly consequences. (enewspf.com)
- Modern agriculture depends on resistance testing to determine the best resistance management and mitigation. (agwired.com)
- However, the rate of introduction of new herbicide active ingredients for world agriculture has slowed dramatically, and herbicides with a new mode of action have not been developed and released for more than 30 years. (nmsu.edu)
- The Ministry of Agriculture should combat the issue of illegal in antimicrobial pesticide importation and promote pesticide awareness, resistance especially in the districts at the borders. (who.int)
Classes of herbicides1
- The data generated showed that the majority of the fields sampled contained waterhemp resistant to at least one of these two classes of herbicides. (illinois.edu)
Class of herbicides2
- Today it is common to rely on repeated use of a single class of herbicides," says Rod Lym, WSSA president. (farmprogress.com)
- In a new study from the University of Illinois, scientists document waterhemp's resistance to yet another class of herbicides, known as Group 15s. (eurekalert.org)
Reported in 19571
- The first known case of herbicide resistance was reported in 1957 when a spreading dayflower in Hawaii was found to be resistant to a synthetic auxin herbicide. (isaaa.org)
Testing resistance to glyphosate1
- Answer 2: No, the protocol used for testing resistance to glyphosate looks for the amplification of the EPSPS gene. (illinois.edu)
Single herbicide3
- WSSA scientists say the single most important factor contributing to resistance is overreliance on a single herbicide - or group of herbicides - with the same mechanism of action. (farmprogress.com)
- We are encouraging American growers to look more toward non-herbicide practices to try to break the cycle of over-reliance on single herbicide modes of action," he said. (graincentral.com)
- The site has experienced repeated use of a single herbicide or herbicides with the same site of action/mode of action. (collegefundlandscaping.com)
Ineffective3
- Weed seeds, collected from fields located in various regions of Poland where herbicide use was ineffective, were used in studies conducted under greenhouse conditions. (plantprotection.pl)
- Results from the study showed that H. cordata could not be controlled by the recommended concentrations of herbicides commercially available for horticultural uses in the U.S. Doubling the recommended herbicide concentration was also ineffective in exterminating H. cordata plants. (purdue.edu)
- Your weed control program might have just been ineffective, leading us back to the original question in this article: Are you seeing weed escapes because of resistance or because of an unsuccessful program? (corteva.us)
HRAC1
- The 2022 HRAC poster of herbicide modes of action includes the majority of chemicals listed below. (wikipedia.org)
Synthetic auxin2
- The same year, a wild carrot in Ontario, Canada was found to be resistant to some of the same synthetic auxin herbicides . (isaaa.org)
- The compound 2,4-D (2,4-dichlorophenoxyacetic acid) is a synthetic auxin used as a herbicide. (botany.one)
20183
- For example, in Canada, the use of GM HT soybeans has resulted in a decrease of herbicide use compared to use on the conventional equivalent every year from 1997-2018. (montana.edu)
- However, from 1997 - 2006, and from 2015 - 2018, the average volume of herbicides used in Brazil represented an average decrease. (montana.edu)
- Unlike this increase, the aggregate global amount of herbicide used on GM cotton, corn, and canola decreased from 1997-2018. (montana.edu)
Certain herbicides1
- It is an intermediate in the manufacture of certain herbicides. (cdc.gov)
RoundUp1
- This study consisted of two rounds of tests to examine the resistance of H. cordata plants to three commonly used herbicides: SpeedZone, Weed-B-Gon, and Roundup. (purdue.edu)
Biotypes1
- Mechanizm odporności chabra bławatka (Centaurea cyanus L.) na herbicydy sulfonylomocznikowe [Mechanism of resistance to sulfonylurea herbicides of Centaurea cyanus L. biotypes cross-resistant]. (plantprotection.pl)
Alopecurus1
- Herbicide resistance of blackgrass (Alopecurus myosuroides Huds. (plantprotection.pl)
Blackgrass1
- Blackgrass has become the most economically damaging herbicide-resistant weed in Europe. (newzs.de)
Greenhouse2
- Greenhouse dose-response studies with postemergence (POST) applications of molinate, thiobencarb, fenoxaprop-ethyl, and bispyribac-sodium estimating GR 50 (herbicide dose to inhibit growth by 50%) values suggested resistance to all herbicides in two E. phyllopogon accessions and to molinate and thiobencarb in one E. oryzoides accession when compared with susceptible E. phyllopogon and E. oryzoides controls, respectively. (bioone.org)
- Herbicide treatments were applied outside the greenhouse. (purdue.edu)
Waterhemp survivors2
- After applying herbicide, select five waterhemp survivors in the field. (illinois.edu)
- After applying herbicide, select up to 5 waterhemp survivors. (illinois.edu)
Mechanism of act1
- The Weed Science Society of America also classifies herbicides by their mechanism of action. (wikipedia.org)
Action Committee1
- Herbicides Resistance Action Committee. (wikipedia.org)
Translocation3
- Often involves multiple genes and mechanisms and can include things such as reduce uptake, reduced translocation or comparmentalisation of the herbicide. (farmpep.net)
- The mode of action involves absorption into the plant, translocation (or movement) in the plant, metabolism of the herbicide, and the physiological plant response. (collegefundlandscaping.com)
- Non-target site mechanisms can impede herbicide uptake, translocation, and accrual or else protect the plant against the actions of the herbicide (Delye 2013). (wsu.edu)
Residual3
- The seed bioassay was not a suitable method for detecting resistance to the residual herbicides pendimethalin and prosulfocarb. (rothamsted.ac.uk)
- Watch this video to learn how herbicide resistance develops and the practices that put your farm at greatest risk, and read our newest pulse agronomy fact sheet to learn more about how soil residual h. (farms.com)
- When a weed pops up mid-season, it's hard to tell exactly when it emerged and whether it was exposed to residual soil-applied herbicides. (eurekalert.org)
Antimicrobial Resistance7
- Leone leads to a fungicides and bactericides could increase the risk of possible increase antimicrobial resistance among humans. (who.int)
- Antimicrobial resistance (AMR) has recently been shown to account for more global deaths than HIV and malaria collectively, and it is in Western sub-Saharan African countries, such as Sierra Leone, that it is showing the highest rate of age-adjusted mortality. (who.int)
- Production and Antimicrobial Resistance. (who.int)
- CDC supports innovative research to slow antimicrobial resistance through various funding mechanisms . (cdc.gov)
- The projects complement additional CDC antimicrobial resistance investments, collectively known as CDC's AR Solutions Initiative. (cdc.gov)
- Through these investments, CDC is transforming how the nation combats and slows antimicrobial resistance at all levels. (cdc.gov)
- ICAP will also support capacity of the National Public Health Laboratory in Kenya to detect and test for antimicrobial resistance. (cdc.gov)
Auxin2
- The action of auxin in plants is highly complex because large gene families are involved in its perception, signalling, transport, and metabolism, making unravelling evolved resistance a puzzle. (botany.one)
- The authors identified three proteins as being related to 2,4,-D resistance: two receptor-like kinases of unknown function, as well as an ATP-binding cassette transporter, ABCB19, which acts as an auxin efflux transporter, moving the compound throughout the plant. (botany.one)
Acetolactate synthase1
- The herbicides glyphosate and pyrithiobac inhibit the enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) in the aromatic amino acid biosynthetic pathway and acetolactate synthase (ALS) in the branched-chain amino acid biosynthetic pathway, respectively. (bvsalud.org)
Modes of action6
- The multiple-resistance to these four modes of action is a real game changer for growers. (graincentral.com)
- Rotating herbicide modes of action can reduce risk of resistance developing to these widely used herbicide groups. (farmpep.net)
- The introduction of new herbicides and herbicide modes of action to replace those herbicides failing due to resistance is essential for weed management. (nmsu.edu)
- Herbicides work through modes of action, and there are plenty of them. (collegefundlandscaping.com)
- One of the most successful ways to treat herbicide resistance is by mixing herbicides of different modes of action. (collegefundlandscaping.com)
- Some herbicide modes of action will develop herbicide resistance more easily than others based on the way the herbicide works in the plant. (corteva.us)
Susceptible3
- Resistance ratios were obtained by comparing herbicide dose-response curves between the ACR population and a herbicide-susceptible waterhemp population. (illinois.edu)
- They compared the plasma membrane proteome of a susceptible population with that of a resistant population under control and herbicide-treated conditions. (botany.one)
- Herbicide resistance is the inherited ability of a plant to survive and reproduce following selection with a dose of herbicide normally lethal to the susceptible type of the plant. (nmsu.edu)
Dose-response2
- Multiple doses are used to allow the production of a dose-response curve that will show the magnitude of resistance. (agwired.com)
- No resistance was detected in dose-response studies with propanil. (bioone.org)
Insecticide2
- Multiple insecticide resistance and associated mechanisms to volatile pyrethroid in an Aedes albopictus population collected in southern China. (cdc.gov)
- Status of insecticide susceptibility in Anopheles arabiensis and detection of the knockdown resistance mutation (kdr) concerning agricultural practices from Northern Sudan state, Sudan. (cdc.gov)
Genetically4
- Rebutting this criticism, others assert that resistance is a problem for all pesticides, not only genetically modified ones, and that with sufficient controls, resistance can be delayed, if not avoided. (lawbc.com)
- The seed producer Monsanto India Ltd has sought regulatory approval in India to sell its genetically modified (GM) corn that is tolerant to herbicides. (indiatogether.org)
- Melinda SmaleMichigan State UniversityPatricia ZambranoInternational Food Policy Research Institute (IFPRI)Rodrigo Paz-YbarnegarayFundación Valles, CochabambaWilly Fernández-MontañoIndependent Consultant The Bolivian National Constitution of 2009 prohibits the commercialization of genetically modified organisms, but the decree permitting the unique event of glyphosate resistance was enacted earlier. (agbioforum.org)
- Michele C. Marra, Nicholas E. Piggott, and Barry K. GoodwinNorth Carolina State University Recently, one type of corn rootworm has developed resistance to a single strain of Bacillus thuringiensis (Bt) that is genetically engineered into corn seed. (agbioforum.org)
Practices3
- Chief among them are recommendations that growers diversify their weed management practices and the types of herbicides they use. (farmprogress.com)
- In addition to best practices for growers, the WSSA report also recommends important steps that other key stakeholders should take to address the increasingly urgent problem of herbicide resistance. (farmprogress.com)
- Once multiple resistance takes hold there really are less options available and most of them will have a production penalty, but if these practices are not adopted then production systems will fail. (graincentral.com)
Multiple11
- It can also be incredibly difficult to control - a characteristic that has only worsened in the last few years, as its resistance to multiple-herbicide groups continues to evolve. (realagriculture.com)
- Multiple resistance : when plants exhibit 2 or more resistance mechanisms to different herbicide active ingredients. (farmpep.net)
- Perhaps even more unnerving is the occurrence of multiple herbicide resistances within individual plants and/or fields. (illinois.edu)
- Thus, individual plants-not just the population as a whole-displayed multiple herbicide resistance. (illinois.edu)
- Patzoldt, WL , Tranel, PJ & Hager, AG 2005, ' A waterhemp (Amaranthus tuberculatus) biotype with multiple resistance across three herbicide sites of action ', Weed Science , vol. 53, no. 1, pp. 30-36. (illinois.edu)
- A population-level investigation uncovers deep population differentiation for local adaptation, multiple target-site herbicide resistance mutations of barnyard grasses, and limited domestication of barnyard millets. (nature.com)
- Multiple resistance to glyphosate and paraquat (WSSA Group 22) has been detected in horseweed/marestail and hairy fleabane in California. (wsu.edu)
- Multiple resistance to glyphosate and glufosinate (WSSA Group 10) has been detected in Italian ryegrass in Oregon. (wsu.edu)
- With resistance to multiple common herbicides, waterhemp is getting much harder to kill. (eurekalert.org)
- Management of herbicide resistance in Horseweed using multiple spectrums of herbicides. (soybeanresearchinfo.com)
- Backscheider says resistance can develop in a certain location quickly or slowly, depending on multiple factors. (corteva.us)
Wild oat1
- Resistance is also present in winter wild oat. (ahdb.org.uk)
Genes1
- Resistance in sunflower can only be achieved with homozygocity (Imr1,Imr1,Imr2,Imr2) of both resistance genes in an inbred line or in a hybrid. (usda.gov)
Mutations1
- These mutations lead to physical changes in the enzyme's shape/structure, which prevents herbicide-binding, thus reducing or eliminating herbicidal activity. (wsu.edu)
Uptake1
- While studies have ruled out several common modes of resistance such as reduced uptake or metabolic detoxification, the mechanism at work in wild radish is still unknown. (botany.one)
Occurrences1
- Whether EPA independently collects and assesses data on, and mitigates actual occurrences of, herbicide resistance in the field. (lawbc.com)
Pesticide1
- Pesticide resistance is not a new issue and is one that EPA has affirmatively addressed when granting registrations for new products, GE or not, for some time. (lawbc.com)
Commonly1
- Weed seed samples collected were screened for resistance to commonly used herbicides at recommended field rates. (edu.au)
Control6
- The Centers for Disease Control and Prevention (CDC) named resistance to antibiotics one of the world's most pressing public health problems of our time . (enewspf.com)
- Please include herbicide use history, herbicides and rates applied this season, comments on observed weed control, and any other relevant information. (illinois.edu)
- Nolan Kowalchuk, Technical Sales Manager at FMC of Canada, recommends growers start their herbicide layering program by applying an extended control, pre-emergent herbicide - such as Focus® (Group 14 and 15) - at pre-seed timing. (fmcpreschool.com)
- Worldwide, herbicides remain the most efficient and widely used technology for large-scale weed control. (nmsu.edu)
- Incorporating an herbicide resistance gene into tropical maize with inherent polygenic resistance to control Striga hermonthica (Del. (iita.org)
- In other situations, there are mechanisms of resistance such as gene amplification where a 100x rate won't control the resistant weed, so resistance happens very quickly. (corteva.us)
Lethal1
- Herbicide resistance is the inherited ability of a weed to survive a rate of herbicide which would be lethal to a member of the normal population. (farmpep.net)
Concentrations3
- Chronic toxicity tests, using the same herbicide concentrations, were also carried out during 21 days using neonates of F1 first brood (F1-1st) and F1 third brood (F1-3rd) offspring generations from the parentals (F0) preexposed to the herbicide. (unboundmedicine.com)
- Finally, survival was not affected after exposure to the selected molinate concentrations except in those daphnids from the F0 generation in which survival decreased 51% and 78% at the highest herbicide concentrations tested (9.42 and 18.85 mg/L). Our results suggest that the offspring daphnids seem to be adaptated to the herbicide molinate, showing more longevity and reproduction than their parentals. (unboundmedicine.com)
- Two concentrations of each herbicide were used during each trial in the study: the recommended concentration and twice the recommended concentration. (purdue.edu)
Agricultural1
- José Falck-ZepedaInternational Food Policy Research Institute (IFPRI), Washington, DCArie Sanders, Carlos Rogelio Trabanino, and Rolando Batallas-HuaconPanamerican Agricultural School (Zamorano University), Honduras Insect-resistant/herbicide-tolerant (Bt/RR) maize has been approved for commercialization in Honduras, and has been sold commercially since 2006. (agbioforum.org)
Maize2
- An imidazolinoneresistance (IR) gene was incorporated into maize inbredlines with knownfield resistance to S. hermonthica for developing IR-maize lines withgenetic resistance to the parasite. (iita.org)
- Thirty-six inbred lines selected in West and Central Africa for moderate to high resistance to maize ear rot under conditions of severe natural infection were screened for resistance to aflatoxin contamination using the previously established kernel screening assay. (iita.org)
America1
- Corteva Agriscience North America Herbicide Biology Leader Kelly Backscheider has advice to help you answer this question. (corteva.us)