In 2000, the soybean aphid (Aphis glycines), a pest native to Asia, was found in soybean fields throughout the Midwest, including Michigan. In 2001, an insecticide trial generated preliminary data on control and yield loss in small plots. Soybean yield loss of up to 40% was measured under severe infestation. In 2002, additional replicated trials were conducted to determine insecticide efficacy, optimum timing of treatment, effect of spray adjuvants, and impact of aphid feeding on yield in small plots. Replicated on-farm grower-treated plots were established in counties across the eastern 'Thumb' of Michigan to measure aphid impact and spray efficacy on a larger scale. Results from these trials will be reported, as well as updated recommendations for the 2003 field season in Michigan.
Species 1: Hemiptera Aphididae Aphis glycines (soybean aphid)
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