• insecticide
  • However, as aphid pressure increased over the growing season, the level of population suppression seen by the seed-applied insecticide treatments decreased significantly. (msu.edu)
  • And remember, insecticide treatment also kills many natural enemies, so any aphids that do re-infest a field are not constrained by predators and other natural controls. (unl.edu)
  • favorable
  • The relatively mild weather is favorable for soybean aphids, so make sure and check fields at least once a week. (unl.edu)
  • Factors favorable for aphid increase are relatively cool temperatures, plant stress (particularly drought), and lack of natural enemies. (unl.edu)
  • Treatments
  • In deciding whether to invest in these insecticidal soybean seed treatments, it is important to assess expected early season aphid pressure and weigh that against the cost of the product. (msu.edu)
  • These treatments kill natural enemies and are usually done relatively early so there is plenty of time for aphids to resurge, or re-colonize a field. (unl.edu)
  • For soybeans, neonicotinoid seed treatments typically are not effective against the soybean aphid, because the compounds break down 35-42 days after planting, and soybean aphids typically are not present or at damaging population levels before this time. (wikipedia.org)
  • Crops
  • As of 2013[update] neonicotinoids have been used In the U.S. on about 95 percent of corn and canola crops, the majority of cotton, sorghum, and sugar beets and about half of all soybeans. (wikipedia.org)
  • densities
  • It was demonstrated that the results of control to soybean aphid were 93.5%, 83.9% and 71.8%, soybean growth rates were 28.1%, 16% and 15.3%, respectively, densities of natural enemy in the two interplanting modes were as much treble as that of the control. (k-state.edu)
  • 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)
  • susceptible
  • Thus, the recommended approach to control this virus in peanuts and other susceptible hosts such as soybean is the planting of PeMoV-free seed. (wikipedia.org)
  • pods
  • Later in the season the aphids can be found on all parts of the plant, feeding primarily on the undersides of leaves, but also on the stems and pods. (unl.edu)
  • These aphids feed by sucking plant sap from the leaves (Photo 1), stems (Photo 2) and pods. (uga.edu)
  • Aphids start out in the upper canopy of the soybean and slowly move down the plant to lower leaves, stems, and pods. (lgseeds.com)
  • Seeds
  • As of 2014[update], about a third of US soybean acreage was planted with neonicotinoid-treated seeds, usually imidacloprid or thiamethoxam. (wikipedia.org)
  • Dry and snap beans also differ from soybeans (Glycine max), in which the seeds are consumed in a variety of processed forms such as tofu, soybean meal, oil, and fermented forms such as miso. (wikipedia.org)
  • corn
  • To improve field crop production in northern Michigan, Michigan State University Extension is coordinating local variety trials of forage grains, peas, corn and soybean. (msu.edu)
  • eggs
  • These aphids survive from fall to spring as overwintering eggs exclusively on buckthorn. (uga.edu)
  • 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)
  • Rag2
  • The gene mapped to soybean linkage group F, flanked by the simple sequence repeat marker loci Satt510, Soyhsp176, Satt114, and Sct_033, located in the same region as the aphid resistance gene Rag2. (environmental-expert.com)
  • Since the resistance gene in PI 200538 also gave resistance to soybean aphid biotypes 1 and 2, it is possible that the gene is Rag2 and not a new aphid resistance gene. (environmental-expert.com)
  • establishment
  • This could be a limiting factor for soybean aphid establishment in central and southern Georgia, where buckthorn is not common due to the clay and sandy soils and hot summer temperatures. (uga.edu)
  • life cycle
  • In addition to treatment techniques, the publication also contains information about the soybean aphid life cycle, scouting advice and a statewide summary for 2007. (iastate.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)
  • 2002
  • Aphid identification was verified by Susan Halbert, Florida Department of Agriculture and Consumer Services, Division of Plant Industry, Gainesville, Fla. Soybean aphids have been observed on soybeans in Union County, Ga., (Blairsville) every year since 2002 and in several other Georgia counties in recent years. (uga.edu)
  • field
  • Soybean aphids have recently been found in field surveys in northeast Nebraska from Battle Creek to Ponca. (unl.edu)
  • If a tree line or woodlot is adjacent to the soybean field, make sure and include a few sampling locations near these areas. (unl.edu)
  • Determining if the aphid population is actively increasing requires several visits to the field. (unl.edu)
  • The earlier a field is treated, the greater the chance that any surviving aphids can later reproduce or new aphids can repopulate the field. (unl.edu)
  • The technologies of optimum control of soybean aphid were made up in the three different modes including soybean sown in the same maize hole, soybean interplanted in maize field and monoculture soybean. (k-state.edu)
  • If this virus spreads in perennial peanuts in the Southern USA, this plant could become a reservoir of the virus and increase its spread to field peanut and soybean via aphid transmission. (wikipedia.org)
  • Peanuts
  • An interesting study of the spread of this virus in Georgia showed that the virus moved from infected peanut plants to nearby soybean fields and was only present in soybeans in areas where peanuts were also grown. (wikipedia.org)
  • suggests
  • 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)
  • Late summer scouting in 2005 and early season scouting this spring suggests that aphid levels may be down in 2006 throughout most of the state. (msu.edu)