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  • insect
  • aphid or plant louse, tiny, usually green, soft-bodied, pear-shaped insect injurious to vegetation. (factmonster.com)
  • Richard Harrington retired in 2015 as Head of the Rothamsted Insect Survey, with which he worked for 36 years on aphid monitoring and forecasting. (cabi.org)
  • However, if you find numerous lady bird beetles or lacewing larvae in the tree, you should allow the natural controls, these insect predators of aphids, to do the job. (nmsu.edu)
  • The soybean aphid possesses a heteroecious holocyclic life cycle, which means the insect alternates hosts and undergoes sexual reproduction for at least part of its life cycle. (wikipedia.org)
  • An aphid is a type of sap-feeding insect. (wikipedia.org)
  • Fauna Europaea lists six subspecies: A. f. cirsiiacanthoidis A. f. eryngii A. f. evonymi A. f. fabae A. f. mordvilkoi A. f. solanella The black bean aphid is a small, soft-bodied insect that has specialised piercing and sucking mouthparts which are used to suck the juice from plants. (wikipedia.org)
  • This aphid is usually seen in large numbers and is a tiny, plump insect about two millimetres long with a small head and bulbous abdomen. (wikipedia.org)
  • The beech blight aphid (Grylloprociphilus imbricator) is a small insect in the order Hemiptera that feeds on the sap of American beech trees. (wikipedia.org)
  • In addition to survivability in sub zero temperatures, the aphids are also capable of rapid cold hardiness (RCH) which allows an insect to develop protection against sudden sub freezing temperatures. (wikipedia.org)
  • Aphids: insect pest that sucks sap from plant tissue, excreting a substance called honeydew, which invites other fungal disease. (wikipedia.org)
  • Acyrthosiphon pisum, commonly known as the pea aphid (and colloquially known as the green dolphin, pea louse, and clover louse ), is a sap-sucking insect in the Aphididae family. (wikipedia.org)
  • Aphididae
  • In typical aphids (family Aphididae), two tubes called cornicles project from the rear of the abdomen and exude protective substances. (factmonster.com)
  • The pea aphid genome and other of its features are the focus of studies covering the following areas: Symbiosis with bacteria - As all aphididae, A. pisum hosts the primary endosymbiont Buchnera aphidicola, which provides essential amino acids and is necessary for aphid reproduction. (wikipedia.org)
  • biology of aphids
  • The biology of aphids is bizarre: they can be born pregnant and males sometimes lack mouths, causing them to die not long after mating. (neatorama.com)
  • The book remains a comprehensive and up-to-date reference work on the biology of aphids, the various methods of controlling them and the progress of integrated pest management as illustrated by ten case histories. (cabi.org)
  • Acyrthosiphon
  • Acyrthosiphon pisum is a rather large aphid whose body can reach 4 mm in adults. (wikipedia.org)
  • Its host range in North America is very similar to that of the closely related blue alfalfa aphid (Acyrthosiphon kondoi). (wikipedia.org)
  • infestations
  • Unfortunately, out of doors, damaging aphid infestations can build up in spring before the natural enemies are active in sufficient numbers to achieve control. (rhs.org.uk)
  • However, by mid-summer aphid infestations are often kept in check. (rhs.org.uk)
  • Aphid infestations on tall trees have to be tolerated. (rhs.org.uk)
  • leaf
  • Studies have demonstrated a positive correlation exists between upper leaf nitrogen content of soybean and the occurrence of soybean aphids. (wikipedia.org)
  • Other common names include blackfly, bean aphid and beet leaf aphid. (wikipedia.org)
  • Feeding by this aphid will also cause the flag leaf to turn white and curl around the head causing incomplete head emergence. (wikipedia.org)
  • As the leaf grows, the aphid injects it with a substance, possibly an enzyme or hormone, that causes that the galls to form around her. (wikipedia.org)
  • exude
  • Most aphids have a pair of cornicles (or "siphunculi"), abdominal tubes through which they exude droplets of a quick-hardening defensive fluid containing triacylglycerols, called cornicle wax. (wikipedia.org)
  • densities
  • However, the relatively low densities of soybean aphids during this stage have been found to have minimal impacts on soybean yield. (wikipedia.org)
  • The second stage, or pre-peak stage, can begin as early as late June and is characterized by dramatic increases in densities of soybean aphids. (wikipedia.org)
  • Yield losses as high as 50 to 70% have been documented as a result of prolonged exposure to high densities of soybean aphids. (wikipedia.org)
  • Crops
  • Aphids are among the major global pest groups, causing serious economic damage to many food and commodity crops in most parts of the world. (cabi.org)
  • The Russian wheat aphid (Diuraphis noxia) is an aphid that can cause significant losses in cereal crops. (wikipedia.org)
  • Host control consists of raising crops that are possesses genes that may contribute to aphid resistance. (wikipedia.org)
  • On crops such as peas and alfalfa, A. pisum is considered among the aphid species or major agronomical importance. (wikipedia.org)
  • soybean
  • That's when the first soybean aphids, an Asian species, showed up in Wisconsin. (scienceblogs.com)
  • The soybean aphid is native to Asia. (wikipedia.org)
  • The soybean aphid was first documented in North America in Wisconsin in July 2000. (wikipedia.org)
  • 2004) noted that the soybean aphid probably arrived in North America earlier than 2000, but remained undetected for a period of time. (wikipedia.org)
  • In two studies, the quantity of overwintering eggs had a strong positive correlation with the severity of soybean aphid outbreaks in the following spring. (wikipedia.org)
  • Eggs begin to hatch into fundatrices when temperatures in the spring reach 10 °C (50 °F).[citation needed] Colonization of buckthorn by soybean aphids in the spring can lead to curling of leaves and twigs. (wikipedia.org)
  • These winged soybean aphids begin the spring migration to their secondary host, soybean. (wikipedia.org)
  • Soybean aphids go through approximately 15 generations on soybean, all of which are primarily composed of apterous females produced through viviparous parthenogenesis. (wikipedia.org)
  • Feeding by soybean aphids injures soybean by interfering with photosynthetic pathways-more specifically, biological mechanisms responsible for restoring chlorophyll to a low energy state are impaired. (wikipedia.org)
  • The optimal temperature for soybean aphid development occurs between 25 and 30 °C, and exposure to prolonged temperatures of 35 °C (95 °F) decrease survival rates and fecundity of soybean aphids. (wikipedia.org)
  • twigs
  • If you see great numbers of aphids on many of the twigs in the tree, you may choose to treat to reduce the aphid population and limit the damage to the trees. (nmsu.edu)
  • If you decide to treat, you may use a strong jet of water to wash many of the aphids from the twigs if the infested branches are within range of a strong stream of water from the garden hose. (nmsu.edu)
  • eggs
  • The aphids that hatch from these eggs in the spring are wingless females known as stem mothers. (wikipedia.org)
  • plum
  • There are six strains of plum pox virus: PPV-D, PPV-M, PPV-EA, PPV-C, PPV-Rec (Recombinant), and PPV-W. PPV-M isolates are more aggressive in peach, are aphid vectored more efficiently, and spread more rapidly in an orchard. (wikipedia.org)
  • Winged aphids can transmit plum pox within an orchard, and over short distances (200-300 meters) to trees in nearby orchards. (wikipedia.org)
  • Once the disease becomes established, control and prevention measures for plum pox include field surveys, use of certified nursery materials, control of aphids, and elimination of infected trees in nurseries and orchards. (wikipedia.org)
  • 1996
  • The researches that found D. noxia resistant strains of wheat were in 1996 but genotypes of aphids that were able to overcome these resistance strains began to appear in 2003. (wikipedia.org)
  • buckthorn
  • Sensing the end of summer, the aphids are moving en masse to their winter host, buckthorn . (scienceblogs.com)
  • Maybe (I almost hope) these aphids will become vectors for some horrible buckthorn disease, thus reducing the impact of Rhamnus cathartica , a notorious invasive species from Asia that is causing considerable ecological degradation in upper Midwestern forests and woodlands. (scienceblogs.com)
  • George Heimpel suggests that this whole thing is an invasion meltdown initiated by introduced earthworms, which modify the soil to favor buckthorn growth, which then favors the growth of aphids, which then are good food for the invasive ladybug Harmonia axyridis. (scienceblogs.com)
  • Feeding
  • Aphid feeding in wheat results in qualitative and quantitative losses in flour yield. (wikipedia.org)
  • When feeding on grasses, the aphids suck the sap and at first cause yellow or red spots on the leaves. (wikipedia.org)
  • population
  • Several parasites are known to attack this aphid and it is thought that they will in time be effective in reducing the population numbers of aphids. (wikipedia.org)
  • As these genes are marked for selective breeding, it may serve to manage the population of aphids. (wikipedia.org)
  • This cycle allows the aphid to increase its population dramatically in a relatively short period of time. (wikipedia.org)
  • waxy
  • The aphids themselves are a light bluish color with bodies covered with long, white, waxy filaments giving them a woolly appearance. (wikipedia.org)
  • biomass
  • That would explain all the aphid biomass. (scienceblogs.com)
  • This aphid is actually a huge problem, and the sheer biomass only 10 (or so) years after introduction is absolutely amazing, and speaks to the massive invasive potential of aphids in general. (scienceblogs.com)
  • Insecticidal
  • Horticultural oil or insecticidal soaps are a safer method of destroying aphids and should be tried first before resorting to imidacloprid. (gardenguides.com)