Currently, any populations of soybean aphid should be considered potentially resistant to pyrethroids. Aphids are tiny pear-shaped, soft-bodied insects that suck the juices out of leaves, stems and tender plants– though some species attack lettuce roots and the woody parts of apple tree roots and limbs. Mites may increase after some insecticides (esfenvalerate, permethrin, zeta-cypermethrin) are applied for control of other pests. Thrips are extremely minute insects, usually less than 1/16 inch when full-grown. Furthermore, depending on factors such as relative efficacy, durations of residual activity, and levels of cross resistance, use of some mixtures could provide additional selection pressure for further development of insecticide resistance (IRAC 2012). Insecticides from three insecticide groups are available in foliar formulations for soybean aphid management (IRAC 2018, Knodel et al. Updated February 9, 2017 Economic Threshold: The recommended threshold for late vegetative through R5 stage soybeans is 250 aphids per plant (field average) with 80% of the plants infested and … Tran, A. K., T. M. Alves, and R. L. Koch. Aphis glycines showed higher fecundity than A. solani on soybean and the aphids caused unbalanced reduction in population growth on each other. In the United States, Chandrasena et al. Insecticide use (i.e., percent of planted acres treated with insecticide) (top figure) and crop scouting for insects and mites (i.e., percent of planted acres scouted) (bottom figure) in soybean in the Midwestern Region of the United States. 2017, Koch et al. Ragsdale, D. W., B. P. McCornack, R. C. Venette, B. D. Potter, I. V. MacRae, E. W. Hodgson, M. E. O’Neal, K. D. Johnson, R. J. O’Neil, C. D. DiFonzo, et al. However, the LC5 of beta-cypermethrin enhanced the interspecific inhibition of fecundity between the two aphid species. 2011, Tilmon et al. 2016). Hanson et al. A., J. Menger-Anderson, C. Silverstein, B. D. Potter, I. V. MacRae, E. W. Hodgson, and R. L. Koch. Aphid-resistant soybean varieties have proven effective for soybean aphid management, particularly when multiple resistance (Rag) genes are pyramided in individual lines (Hesler et al. Foster, S. P., G. Devine, and A. L. Devonshire. Selective insecticides (i.e., toxic to pest, but less toxic to natural enemies), such as flonicamid (Group 29) (Bahlai et al. Report suspected cases of insecticide-resistant soybean aphids to a local/regional extension educator or extension entomologist. This area of Minnesota also receives significant numbers of pyrethroid insecticide applications to canning crops, which are often adjacent to soybean. It is used to control chewing, sucking, and flying insects such as beetles, aphids, and other Lepidoptera. In agroecosystems, plant-pest interactions are at the basis of complex food webs, which can be affected by both biotic and abiotic factors. Search for other works by this author on: Department of Entomology, Iowa State University, Science II, Ames, IA, Department of Plant Pathology, North Dakota State University, Walster Hall, Fargo, ND, Agronomy, Horticulture, and Plant Science Department, South Dakota State University, Berg Agricultural Hall, Brookings, SD, Southwest Research and Outreach Center, University of Minnesota Extension, Lamberton, MN, Soybean aphid (Hemiptera: Aphididae) affects soybean spectral reflectance, Choosing organic pesticides over synthetic pesticides may not effectively mitigate environmental risk in soybeans, Shifts in dynamic regime of an invasive lady beetle are linked to the invasion and insecticidal management of its prey, Soybean aphid feeding injury and soybean yield, yield components, and seed composition, An aphid-dip bioassay to evaluate susceptibility of soybean aphid (Hemiptera: Aphididae) to pyrethroid, organophosphate, and neonicotinoid insecticides, Interactions of effects of host plant resistance and seed treatments on soybean aphid (Aphis glycines Matsumura) and soybean cyst nematode (Heterodera glycines Ichinohe), Trends in pesticide use on soybean, corn and cotton since the introduction of major genetically modified crops in the United States, Large-scale deployment of seed treatments has driven rapid increase in use of neonicotinoid insecticides and preemptive pest management in US field crops, Aphid-resistant soybean varieties for Minnesota, Evidence for soybean aphid (Hemiptera: Aphididae) resistance to pyrethroid insecticides in the upper midwestern United States, Soybean aphid field guide for the north-central region (2nd edition). 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