Plant age- and plant stage-related changes in the resistance of rice, Oryza sativa, to its most important insect pest in the US, the rice water weevil (Lissorhoptrus oryzophilus), were investigated in a series of field and greenhouse choice and no-choice studies. Rice plants were susceptible to infestation by rice water weevils over a broad range of plant ontogenetic stages, from at least the early vegetative stage to well into the reproductive stage. There was, however, a clear preference expressed by rice water weevils in both choice and no-choice experiments for plants in (or nearly in) the tillering stage of development, with pre-tillering and reproductive stage plants less preferred. The relationship between rice plant age and susceptibility to weevils is thus nonlinear. This study constitutes one of the most thorough studies to date of the relationship in a grass species between plant age and susceptibility to herbivores. The results provide a biological explanation for observed patterns ...
The rice water weevil, Lissorhoptrus oryzophilus, is the most harmful insect pest of rice in the United States, causing yield losses of up to 25 percent. Adults inflict damage by consuming leaf tissue, and the larvae feed on the roots of rice plants. A native of the southeastern U.S., the rice water weevil invaded Japan in 1976, Korea in 1980, China in 1988, and Italy in 2004. Luckily, rice growers now have a new resource for controlling it. An open-access article appearing in the Journal of Integrated Pest Management discusses the rice water weevils life history and invasion biology, as well as management strategies and future directions of research.. Authors Mohammad-Amir Aghaee and Larry D. Godfrey, both from the University of California, Davis, tell the story of the weevil since it was first identified as a pest in 1881 by C. V. Riley and L. O. Howard. They then discuss reasons why it has been able to spread so rapidly - up to 36 kilometers per year in some cases - which is partly because ...
Cytogenetic characteristics and genome size are powerful tools for species characterization and identification of cryptic species, providing critical insights into phylogenetic and evolutionary relationships. Sitophilus Linnaeus, 1758 grain weevils can benefit from such tools as key pest species of stored products and also as sources of archeological information on human history and past urban environments. Moreover, the phylogenetic relationship among these weevil species remains controversial and is largely based on single DNA fragment analyses. Therefore, cytogenetic analyses and genome size determinations were performed for four Sitophilus grain weevil species, namely the granary weevil Sitophilus granarius (Linnaeus, 1758), the tamarind weevil S. linearis (Herbst, 1797), the rice weevil S. oryzae (Linnaeus, 1763), and the maize weevil S. zeamais Motschulsky, 1855. Both maize and rice weevils exhibited the same chromosome number (2n=22; 10 A + Xyp). In contrast, the granary and tamarind ...
Weevils on sago palms cause extensive damage and many gardeners are asking how to control palm weevils. Click the article that follows for more information about palm weevil damage and sago palm weevil control.
This is a Rhynchophorus ferrugineus, the red palm weevil is a species of beetle. It is relatively large, between two and five centimeters long, and a rusty red colour. Its larvae excavate holes up to a metre long in the trunk of palm trees, and can kill the host plant. As a result, the beetle is a pest of palm plantations of palms such as the coconut palm, date palm or oil palm.[2] Originally from tropical Asia, the red palm weevil has spread to Africa and Europe, reaching the Mediterranean in the 1980s, and was first recorded in Spain in 1994 and in France in 2006 ...
A one-day Interactive Workshop on Participatory Extension Approach for Coconut Red Palm Weevil Management was conducted at ICAR-CPCRI, Regional Station, Kayamkulam on 02-12-2015 as concluding part of the State Planning Board funded project carried out by Dr. P. Anithakumari, Principal Scientist (Ag. Extension). The project was operational at Bharanikavu Gramapanchayat in 200o ha area cutting across 21 wards for a period of two years (2013-2015) involving 7500 farm family members based on profile of 1,75,000 palms of various age groups and management options, wherein 4.12% of the palms were found infested. The project interventions could bring down the red palm infestation level ranging from 30% to 88% in different wards, with an average of 55.85%.. Dr. V. Krishnakumar, Head of the Station chaired the Interactive Workshop. In his presidential address, he highlighted the presence of denser volatile cues of coconut in root (wilt) disease zone inciting red palm weevil attack in a significant manner. ...
Tangier: 11-13 April 2016. The Sub regional office of the FAO for North Africa supported the Arab Maghreb Union (UMA) and the Near East Plant Protection Organization (NEPPO) in organizing a workshop for Maghreb in order to revitalize and strengthen the exchange and cooperation between the countries of the sub-region in the protection of plants against the menace of two main pests threatening the date palms production (the red palm weevil) and olive trees (the Xylella fastidiosa bacterium).. Given the urgency of the situation, FAO launched a Regional Technical Cooperation Program to assist countries in the Middle East and North Africa in facing the threat of the "Xylella fastidiosa" on olive trees. A new Technical Cooperation Program (TCP) of Emergency is also being prepared to assist the government of Mauritania in controlling the "red palm weevil" in the "Tidjikja" oasis.. During the three-day workshop, the members of the Plant Committee of the UMA, supported by national and international ...
Arant FS 1938. Life history and control of the cowpea curculio. Alabama Agricultural Experiment Station Bulletin 246. 34 pp. Bell JV, Hamalle RJ. 1971. A bacterium and dipterous parasite in wild populations of cowpea curculio larvae: effects of treatment with spores of Metarrhizium anisopliae. Journal of Invertebrate Pathology 17:256-259. Capinera JL 2001. Handbook of Vegetable Pests. Academic Press, San Diego. 729pp. Chalfant RB. 1973b. Cowpea curculio: control in southern Georgia. Journal of Economic Entomology 66:727-729. Chalfant RB, Young JR. 1988. Cowpea curculio, Chalcodermes aeneus Boheman (Coleoptera: Curculionidae); insecticidal control on the southern pea in Georgia, 1980-1986. Applied Agricultural Research 3:8-11. Chalfant RB, Suber EF, Canerday TD. 1972. Resistance of southern peas to cowpea curculio in the field. Journal of Economic Entomology 65:1679-1682. Chalfant RB, Mullinix B, Nilakhe SS. 1982. Southern peas: interrelationships among growth stage, insecticide applications, and ...
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Th Weevils (Curculionidae) are the most numerous of all beetles and over 40,000 species have received names. Their distinguishing mark is the long snout, which has jaws at the end of it and is used for boring holes in the seeds, fruits, buds etc. in which weevils will lay their eggs. The Palm Weevil (Rhynchophorus…
The red palm weevil is a beetle species curculionoideo , the curculionidae family, native to tropical Asia. Weevil is large , two to five centimeters. Its redd
Many of us in Britain will have heard the name Weevil uttered at some time or another. For me, I first heard it as a child when I opened up a bag of flour to find it crawling with Weevil larvae. Recently, I came across a Weevil infestation in a large quantity of bird seed and I realised that although I knew what the insect was, I didnt know much else about it. So I set off to learn a few facts on this common insect. There are over 60,000 species of weevil worldwide. The Rice, Granary and Maize Weevils are pests of grain throughout the world and can cause extensive damage to stored grain. The weevil I came across was the Granary Weevil, Sitophilus granarius, and this is the insect we will focus on in this article.. The adult Granary Weevil is dark brown to black in colour, about 3-4mm in length and cannot fly. The Weevil has a distinctive look due to the large snout extending from the head. The larvae are white, legless grubs that eventually change to white naked pupa, before emerging from the ...
High levels of resistance to phosphine in the rice weevil Sitophilus oryzae have been detected in Asian countries including China and Vietnam, however there is limited knowledge of the genetic mechanism of resistance in these strains. We find that the genetic basis of strong phosphine resistance is conserved between strains of S. oryzae from China, Vietnam and Australia. Each of four strongly resistant strains has an identical amino acid variant in the encoded dihydrolipoamide dehydrogenase (DLD) enzyme that was previously identified as a resistance factor in Rhyzopertha dominica and Tribolium castaneum. The unique amino acid substitution, Asparagine , Threonine (N505T) of all strongly resistant S. oryzae corresponds to the position of an Asparagine , Histidine variant (N506H) that was previously reported in strongly resistant R. dominica. Progeny (F16 and F18) from two independent crosses showed absolute linkage of N505T to the strong resistance phenotype, indicating that if N505T was not ...
Paring and hot-water treatment of banana suckers have been recommended to prevent the spread of banana weevil, Cosmopolites sordidus Germar, into new banana plantations. Mortality of banana weevil eggs and larvae were recorded after immersion of infested banana suckers in four hot-water regimes: 43C for 2 hours, 43 C for 3 hours, 54 C for 20 minutes and 60 C for 15 minutes. Paring removed 90 % of banana weevil eggs, while all hot-water treatments resulted in 100 % mortality of eggs. However, only hot-water baths of 43C for 3 h resulted in high mortality (94 %) of weevil larvae. Larval mortality in other treatments ranged from 26-32 %. It is unlikely that Ugandan farmers will implement three-hour hot-water baths for banana weevil control. Also, the hot-water treatment that is most effective for nematode control (54 C for 20 min) provided limited control of banana weevil The data suggest that paring alone may be the most appropriate measure for resource-poor farmers to eliminate banana weevil from
4-Methyl-5-nonanol (1) is the male-produced aggregation pheromone of the palm weevil, Dynamis borassi (F.) from Colombia. The pheromone was identified by coupled gas chromatographic-electroantennographic detection (GC-EAD) analysis of male- and female-produced volatiles, and comparative GC-mass spectrometry (MS) of weevil-produced 1. In field experiments in Colombia, traps baited with a stereoisomeric mixture of synthetic 1 (3 mg/day) plus sugarcane captured more weevils than traps baited with 1 or sugarcane alone, suggesting that pheromone and plant volatiles are synergistically attractive. Use of a chiral, stereoisomer-separating Cyclodex-B column in GC-EAD and GC-MS analyses revealed that D. borassi males produce, and antennae of males and females respond to (4S,5S)-1. Previously identified palm weevil (Rhynchophorus spp.) aggregation pheromones 5-methyl-4-octanol (cruentol) and 6-methyl-2-hepten-4-ol (rhynchophorol) also elicited antennal responses by D. borassi. In field experiments, D. ...
This chapter discusses in detail the boll weevil in Georgia, where the image of the boll weevil as the destroyer of the plantation system has proven stronger and more lasting than in any other state. The state leaders made the appearance of preparing the farmers to fight the weevil as the pest approached and then finally invaded Georgia. Since the earliest days of the boll weevils arrival in the state, Georgias farm experts had been very concerned about a labor exodus, and in Georgia, the outmigration had been heavy. The idea that the boll weevil eliminated their cotton livelihood came closer to the truth there than in any of the other Deep South states. The appearance of the pest did correspond with both a decline in the states cotton production and an exodus of cotton laborers. ...
Adult strawberry root weevils are about 5 to 8 mm long. They are usually black, but some may be light-to dark-brown. They have rows of round punctures on the wing covers. All the adults are females. They cannot fly. Larval root weevils are legless grubs with pinkish-white C-shaped bodies and brown heads. They are about 6 mm long.. Root weevils reproduce asexually and all root weevils are therefore female. These beetles are unable to fly and are active at night. Most root weevils overwinter as larvae near the roots of their host plants. In spring they pupate and adults begin to emerge in early July. Adult weevils are 5-9 mm long and vary in colour from black to light brown to gray in colour, depending upon the species. In late July, the females deposit the eggs near the crown of the host plant. The eggs hatch and the larvae burrow into the soil to feed on the roots for the remainder of the season. Larvae are legless grubs with whitish bodies and brown heads and reach a length of 6 mm. There is ...
Size:. ¼-inch long. Color:. Black to blackish-brown. Behavior:. The strawberry root weevil is one of the more common of structure-invading weevils encountered around homes. Both adults and larvae feed primarily upon strawberry plants but will also attack bramble and evergreens such as pine and yew. In nurseries, they are known to be pests of some evergreen shrubs. Both the strawberry root weevil larvae and adults overwinter within leaf litter and other vegetative debris on the ground and, upon warming weather, larvae begin feeding in the soil on the plant roots. The adults emerge soon after and infest the above-ground parts of the plants. Generally, two generations of strawberry root weevils may occur each year. This weevil cannot fly and disperses by crawling, which often brings them wandering into homes and other buildings. In some cases large numbers of weevils may be discovered crawling on floors, walls and even ceilings.. ...
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There are between 40,000 to 60,000 species of weevils--which are a type of beetle--in the world. Most weevils are smaller than 1 inch long; many are smaller than 1/2 inch. Unfortunately, their small size doesnt prevent them from destroying entire cupboards full of food or a field of grain. One female weevil produces around 400 eggs in her short lifetime. It does not take long for a few weevils to become many weevils. Weevils that commonly infest homes, such as granary weevils and rice weevils, lay their eggs inside kernels of grain, which provides food for the growing larvae. Warm, humid temperatures provide ideal conditions for weevil infestations.. ...
The Strawberry Root Weevil, is one of the many species in the weevil family (Curculionidae). Its name comes from its affinity for strawberry plants, which form a large part of its diet. They are, however, known to feed on other plants as well. It is known to be one of the major pests threatening sub-tropical strawberry farming. The adult strawberry root weevil is about six millimeters long, and is dark brown/black in color.. They are often found in the leaves and foliage of the plants they feed on. The adult weevils elytra are fused together, which means they are unable to fly. The larvae can be up to thirteen millimeters long when fully grown and they are found near the roots of the plants they are infesting. The larvae are white, legless, with a darker colored head and are often C-shaped.. Controlling the strawberry root weevil includes a wide variety of methods such as the use of insecticides, plowing under old crops and crop rotation, cleaning farm equipment before moving to a new field, ...
The seasonal history of this pest in Louisiana begins in early spring, when adult weevils emigrate from their overwintering sites to rice fields. Models based on more than 20 years of flight records and weather data predict initial flights of weevils in early April in southwestern Louisiana. Upon arrival in rice fields, adult weevils feed on leaves of rice plants, leaving lengthwise feeding scars. This type of injury, although evidence of the presence of weevils in a field, usually does not result in economic losses. Serious problems do not begin until the rice fields are flooded and the weevils begin to lay eggs. The newly hatched larvae feed externally on the rice plant roots. Root pruning by larvae can damage root systems extensively, ultimately reducing grain yields. The insect has two to three overlapping generations in southern Louisiana. In August, adults of the final generation fly to overwintering sites, primarily wooded areas, and live in bunch grasses and under leaf litter.. An ...
On Wednesday, November 03, 2010, a team of scientists from CISR, CDFA, UCCE, USDA-APHIS, the Orange and San Diego County Agricultural Commissioners Offices and West Coast Arborists returned to the Red Palm Weevil (RPW) affected site in Laguna Beach California. Inspection of a unhealthy Canary Islands palm the previous week resulted in the discovery of a live adult RPW in the trunk. Discussions concluded that the infected tree should be removed to prevent the continued possible breeding and spread of the RPW from that palm to other areas in the immediate vicinity.. The two main goals of the CDFA-sponsored project were: (1) removal and destruction of the RPW infested palm, and (2) to dissect the palm and determine how deep the infestation had proceeded through the trunk of the infested palm. It was decided that dissection of the palm could provide useful information on the level of RPW infestation in the trunk, if any live stages were still present, and how severe the internal damage was.. The ...
South American Palm Weevil invades Pacific Beach trees - It appears a palm weevil infestation that has been moving up from the U.S.-Mexico border has finally found its way to Pacific Beach. Evidence of that is a dead palm at 1830 Reed Ave. that ha...
The product comes in two forms: a liquid spray for cleaning inside drawers and cupboards and a scent pad for releasing a continuous aroma thats unpleasant to weevils and other insects but smells great to humans. Weevil Away is not a pesticide, and its safe to use in food storage areas without rinsing. The main ingredients of the patented formula include botanicals, such as bay, spruce and mint oils.. Our product is completely safe to apply near food, said Joe Rodriguez of Weevil Away. Users dont have to clean out the pantry, wear masks or vacate the area. The smell is actually quite pleasant to people, but weevils, roaches and pantry moths go elsewhere when they catch a whiff. Anyone who has battled a weevil infestation knows how costly and frustrating it can be to evict these little beasts. Weevil Away works the first time, and users never have to worry about accidentally re-introducing the bugs later.. Weevil Aways creators recommend first wiping down potential weevil habitats (e.g., ...
Hello Bin Weevils! Hello and welcome to Extreme Weevil, a Bin Weevils Fan Site bringing you all the Bin Weevil info you need, for your Weevil! This site was created by Oliver, a Bin Weevils player that loves to blog about Bin Weevils and will help you wherever you go around the wacky world of…
As for the weevil shot, I did stack the 250 shots in one go. One manual slab was needed to retrieve the details for part of the antenna (where both antennas cross). It was an easy one as no hairs was invloved here. Somehow, I think Im not practising the slabbing correctly although I tried many methods here.. the final results of stacking the slabs is always horrible to me ...
BioAssay record AID 1092696 submitted by ChEMBL: Insecticidal activity against Sitophilus oryzae (rice weevil) infected wheat assessed as increase in mortality at 0.125 ppm applied as spray after 7 days in absence of diatomaceous earth.
DPI recently identified several weevil samples collected from Miami-Dade, Broward, and Hernando counties as Anthonomus testaceosquamosus, the hibiscus bud weevil. This weevil is currently found in Mexico and Texas, and it causes significant damage hibiscus flower buds. Adults lay eggs on the buds, and larvae burrow into the developing buds where they feed on the pollen. Larval feeding results in flower bud drop. If you notice flower buds dropping off your plants, break open the dropped buds to see if there is a beetle larvae inside. The presence of a larvae may indicate a hibiscus bud weevil infestation.. ...
The Red Palm Weevil o Rhynchophorus ferrugineus is an invasive spice that had become a catastrophic plague for lots of palm trees in Saudi Arabia, but all around the world too. Nowadays, the surveillance of the plague is done using tramps placed near the palm trees, and one person comes to the tramp and counts manually the number of weevils into the tramp. This project is aimed to improve the actual surveillance method. To realize it we have been created a Wireless Sensor Network and different nodes able to obtain the number of weevils into the tramp and they must transmit this data to a mobile node that collect all the data for processing. These sensor units are placed into the tramps, so they measure the weight of the weevils, and the number of them. The sensors are Strain Gauges and the signal conditioning system. This signal obtained from the gauges is processed into the Arduino board. To this microcontroller we can add one shield in order to conect communication devices, in our case, Xbees. ...
Laboratory studies and field observations were conducted to ascertain the development of the female sex organs of the alfalfa weevil during aestivation, to study the role of this aestivation on sexual development, and to investigate the factors responsible for this interaction.. Measurements of female sex organs were made in dissected weevils at monthly intervals to observe each of the developmental stages of sexual maturation. Results of this sexual development as it progressed after adult emergence, were presented by means of tables, graphs, and a series of photographs.. The importance of not confusing old and new weevils was recognized in this work, since their behavioral patters differ in many respects. The nature and physiology of the aestivation of this weevil was discussed and evidence was presented to support the authors suggestion that this aestivation is a "true diapause." It was demonstrated in this paper that diapause synchronized the sexual growth of the alfalfa weevil to the ...
United States Patent 3,803,303 POLYMERIC COMPOSITIONS FOR ATTRACTING COITON BOLL WEEVILS Gerald H. McKibben, Rte. 4; Theodore B. Davich, Westview Drive; Richard C. Gueldner, Maple Drive; Dicky D. Hardee, Highway 12 West; and Paul A. Shedin, 202 Arrow Drive, all of Starkville, Miss. 39759 No Drawing. Filed Jan. 27, 1972, Ser. No. 221,417 Int. Cl. A01n 17/14 US. Cl. 424-84 14 Claims ABSTRACT OF THE DISCLOSURE A synthetically prepared boll weevil sex attractant, two natural plant attractants, and an insect repellent have been formulated so as to include certain glycols and/or derivatives thereof. These formulations, in the form of attractant-containing pellets have been successfully employed to trap and destroy boll weevils for periods up to one Week. Because these new formulations are designed to release the active ingredients at controllable rates the effectiveness of the active ingredients is sustained for longer periods of time than those attained in the prior art. A nonexclusive, irrevocable, ...
The black vine weevil commonly infests containerized perennials in nursery, greenhouse, and poly-house production settings. Black vine weevil adults are nocturnal (i.e., they are active at night), thus monitoring for adults should be conducted at night. The adult weevils feed along the margins of leaves resulting in crescent-shaped notches. Light to moderate notching typically has little effect on plant health. Black vine weevils cannot fly, but they are very active walkers. The primary means of dissemination of this insect to new areas is through potted plants or soil root ball transplants. Black vine weevil larvae (i.e., grubs) are legless and approximately 3∕8 inch in length. If soil conditions become excessively moist or young roots become scarce, larvae will often move to larger roots near the base of the plant.. Life Cycle: Female black vine weevil adults emerge from the soil in late-May to early-June. The adult weevils feed on plant material for approximately 21-42 days before laying ...
Aneulobus (Curculionidae): [Gen nov, n. g., Hylobiini, for, Aneulobus decolor, Aneulobus horridipes, n. spp., Madagascar, p. 10, [Sp nov]]. Apion biforme [Zoology / / Madagascar p. 15]. Apoderus (Haplopoderus) aculeatus [Zoology / / Madagascar p. 14 n. spp]. Apoderus femoralis [Zoology / / var. n Apoderus semiruber p. 15]. Calandrides vrais [Zoology / / of Lacord genera tabulated pp. 24-26]. Calandrotopus (Curculionidae): [Gen nov, n. g., Calandrides vrais, for, Calandra punctiger, n. sp., Myanmar, p. 26, [Sp nov]]. Camptorhinus rubicundus [Zoology / / Madagascar p. 17 n. spp]. Cybebus nigritarsis (Apionidae). Cybebus rufus [Zoology / / Cybebus nigritarsis Madagascar p. 14 n. spp]. Dermatodes (Curculionidae). Desmidophorus hovanus [Zoology / / Madagascar p. 16]. Eremnophilus (Curculionidae): [Gen nov, n. g., for species of, Eremnus, with toothed femora, p. 5]. Eremnus cristicollis (Curculionidae). Eremnus honestus [Zoology / / p. 5 Eremnus humilis p. 6 Eremnus longicornis (Curculionidae). ...
Edible palm weevil larvae (Rhynchophorus phoenicis). Eaten by the indigenous inhabitants of the Ecuadorian Amazon. where it is known as Chontacuro. Also eaten in parts of Africa and Asia. - Stock Video Clip K004/1172
Not all weevils are evil, but unfortunately this species of weevil is quite a pest. The black vine weevil has been found to be a pest of over 100 different wild and cultivated plants. Unfortunately, this species is not the lesser of two evils since its larval and adult stage are both considered pests. The larval stage feeds on the roots of many plants, while the adults feed on the greenery of them. This species of weevil is capable of reproduction through parthenogenesis. Females reproduce specifically through thelytoky, where they produce unfertilized eggs without males. Thelytoky is a rare form of parthenogenesis and has only been recorded in around 1,500 species. Black vine weevils are a difficult pest to control because they have very few natural predators, and are nocturnal in nature. #Canada150 #Biodiversity150. ...
Appendix A. Leaf ties and the invasive Asiatic oak weevil: photo documentation. (Fig. A1, adult weevil, weevil emergence trap, and weevil damage) and figures showing seasonal emergence and mass of adults, density of leaf ties by tree species, and correlation of leaf-tie abundance and weevil abundance by tree species.
I am quite overwhelmed at the quality of the lighting as well as the technical quality and beauty of the stacked images. To me, these photos go far beyond what can be accomplished by most macro photographers. The lighting, the detail, and the overall aesthetic appeal of these photos are incredible in my opinion ...
JACKSON, Tenn. - Tennessee cotton producers will probably spend the recent increase in cotton prices on more pesticides to control boll weevils, a University of Tennessee cotton specialist said Tuesday. Dr. Owen Gwathmey, assistant professor of cotton physiology at the UT experiment station here, said prices for cotton in the range of 72 cents per pound might mean increased profits if not for the boll weevil.. "The boll weevil has been a persistent cotton pest all season, and our trap counts are still quite high," Swathmey said. With every pesticide application, production costs increase.. "The price increase will just provide most producers a comfort zone as they decide whether they can afford another application or two of pesticide," Gwathmey said.. While Tennessee producers have been spared most of the weather problems experienced by growers in the two largest cotton states - Texas and California - boll weevils have been a headache, Gwathmey said.. A relatively mild winter, which allowed many ...
div class=citation vocab=http://schema.org/,,i class=fa fa-external-link-square fa-fw,,/i, Data from ,span resource=http://link.library.in.gov/portal/The-insect-enemies-of-the-cotton-boll-weevil-by/hrnHcC9YI00/ typeof=Book http://bibfra.me/vocab/lite/Item,,span property=name http://bibfra.me/vocab/lite/label,,a href=http://link.library.in.gov/portal/The-insect-enemies-of-the-cotton-boll-weevil-by/hrnHcC9YI00/,The insect enemies of the cotton boll weevil, by W. Dwight Burgess, assisted by R.A. Cushman and C.E. Hood,/a,,/span, - ,span property=potentialAction typeOf=OrganizeAction,,span property=agent typeof=LibrarySystem http://library.link/vocab/LibrarySystem resource=http://link.library.in.gov/,,span property=name http://bibfra.me/vocab/lite/label,,a property=url href=http://link.library.in.gov/,Indiana State Library,/a,,/span,,/span,,/span,,/span,,/div ...
Control of black vine weevils can be directed at adults as they first emerge on favored host plants (rhododendron, hosta, euonymus). Pesticides should be applied thoroughly to kill weevils on the plants and on the media or soil surface where the weevils hide during the day. Examine host plants frequently in late May and early June for fresh feeding damage. A 1997 study in California showed a great reduction of black vine weevil in commercial planters using parasitic nematodes, Steinernema feltiae (327/in2) or Heterorhabditis bacteriophora (474/in2). The use of nematodes could be a viable alternative to chemicals, especially in sensitive public areas. Washington State has a list of Rhododendron varieties resistant to black vine weevil damage available in PDF. The University of Georgia has identified Azalea varieties somewhat resistant. Not all varieties may be suited to NC. Pesticides may be applied to the media or soil surface as a drench to control black vine weevil larvae. Imidacloprid (Merit, ...
Grain weevils (Stiophilus granarius) feeding on cereal grain. This weevil infests and feeds on stored grain and is a serious agricultural pest. It has a long rostrum, which is an elongated part of the front portion of the head. The tip of the rostrum contains tiny chewing mouthparts that are used to bore through the outer layer of the grain to the material within, which the weevil feeds on. The female also lay eggs in the holes she makes, ensuring a supply of food for the developing larvae. Weevils form the largest family of beetles (Curculionidae) worldwide, containing 40,000 known species. - Stock Video Clip K004/0852
The large pine weevil, Hylobius abietis L., is a major insect pest on conifer seedlings in northern Europe. Due to its feeding newly planted trees get girdled, resulting in high seedling mortality (up to 80%). As a consequence great financial losses to the forest industry occur. Today the seedlings are protected with the pyrethroid insecticide cypermethrin. This insecticide is toxic to aquatic organisms and is, from 2010, prohibited for use in Sweden by the Swedish Chemicals Inspectorate. An alternative to insecticides is to protect the seedlings with antifeedants, compounds that, either through taste or smell or both, deter the weevils from feeding. This thesis describes the search for and the synthesis of such antifeedant compounds.. Bark extracts of several woody species, known to be non-palatable to the weevil, were prepared and found to display antifeedant activity against H. abietis. The major chemical constituents of the extracts were tested for antifeedant activity. Antifeedants such as ...
Biology. Overwintered Cypress weevil adults become active around mid-March in most locations in North Carolina. Since the 1970s, the cypress weevil, has infrequently been found damaging cryptomeria in commercial nurseries and landscapes in North Carolina. It is not certain whether the attacks on cryptomeria are occasional outbreaks or if Eudociminus will have a major impact on cryptomeria in the landscape. The cypress weevil is in the same group of weevils as the pales weevil, Hylobius pales, so it may have a similar life history. According to Insects of Eastern Forests, pales weevils overwinter as adults that may be active all winter (but in reproductive diapause) as adults in the forest litter or as larvae. This more or less agrees with what we have seen so far -- grubs are in the wood during the winter but some adults emerge almost immediately when the temperature warms. Adults feed on the stems where the bark is still green but not in the needles. Larvae were reported to feed in the wood ...
Grain weevil: Grain weevil,, (species Sitophilus granarius), insect of the family Curculionidae (order Coleoptera), a common pest of stored grain. This small brown weevil is about 3 to 4
Pine weevils cause major damage to newly planted conifer seedlings in reforestation areas. However, recent findings indicate that small ("mini") seedlings, planted at the age of 7-10 weeks, are gnawed less by pine weevils than the larger, conventionally planted seedlings. Thus, it has been proposed that planting young conifer seedlings in clear-cut areas may reduce the damage caused by pine weevils. In attempts to determine why mini seedlings appear to be less damaged by pine weevils than "conventional" seedlings, the volatiles released by Norway spruce and Scots pine mini seedlings were investigated, since such chemicals are of great importance in herbivore-plant communication, inter alia acting as repellents, attractants or antifeedants.. Volatiles from the seedlings were collected, separated and identified by solid phase microextraction (SPME) followed by gas chromatography-mass spectrometry.. The results show that there are high levels of chemodiversity among both spruce and pine seedlings. ...
Food limitation induces severe competition for obligate seed-feeding insect larvae that are unable to leave the seed selected by their mother. The number of eggs laid per seed and the number of larvae hatched from the eggs are important determinants of whether larval behaviour within the seed will be of the scramble or the contest type. In maize weevils, Sitophilus zeamais, few adults emerge per seed regardless of the number of eggs laid, which may arise from scramble competition, if the optimum egg density (i.e. egg density leading to maximum total larval fitness) is low compared to the number of eggs laid per seed, or from contest competition due to direct interference among the larvae. The behavioural process and the ecological outcome of competition were assessed in two strains of the maize weevil. Neither strain showed a reduction in body mass with increased competition, and they had similar optimal egg densities (two eggs per seed). There was a hump in the larval fitness curve suggesting a
Australian Weevils (Coleoptera: Curculionoidea) Volume I: Orthoceri; Anthribidae to Attelabidae; The Primitive Weevils Elwood C Zimmerman ISBN 0643051457 for sale, Australian Weevils (Coleoptera: Curculionoidea) Volume V: Colour Plates 1-304 Elwood C Zimmerman ISBN 064305149X for sale, Australian Weevils Elwood C Zimmerman for sale
The use of weevils has proven successful in Australia and parts of southern Louisiana. The weevils are not, however, cold tolerant and they can be a challenge to grow and maintain on lakes as far north as Caddo Lake in Texas and Lake Bistineau in Louisiana. Thus, greenhouses with shallow tanks for rearing Salvinia weevils are needed to maintain significant numbers of weevils during periods of winter freezes. The greenhouse needs to have the exact conditions for weevils to prosper, that is why using the correct greenhouse plastic will achieve this.. In 2010, Texas A&Ms Center for Invasive Species Eradication (CISE) funded the first greenhouse for raising weevils. It was built at the Caddo Lake National Wildlife Refuge with the assistance of CLI and many local volunteers and others. At CLIs urging, Senator Kay Bailey Hutchison directed funding from the U.S. Department of Agriculture to CISE for the project. The facility has been used mainly for research, not having the capacity for large scale ...
In 1998 the eucalyptus weevil, Gonipterus scutellatus (Coleoptera: Curculionidae), a major defoliator of the genus Eucalyptus, which causes growth and economic losses, was detected in Chile. This has caused concern because more than 525,000 ha are planted with species of eucalypt. To understand the protein responses of development stages of G. scutellatus fed on the three species of eucalypt trees most important in the country, electrophoretic profiles were obtained and characterized on polyacrylamide gels under denaturizing conditions, and marker proteins were sought through gel densitometry. Proteins became more numerous with insect development. Protein bands were concentrated between 20 and 120 kDa, with the exception of eggs, which presented lower values. The appearance of distinct bands of proteins in the extracts from larvae and adults of G. scutellatus fed on different species of eucalypts reflected changes in their metabolism. These results are useful for integrated pest management, as ...