No. 19 Article 2/July 31, 2009

Soybean Aphid Numbers Remain Low in Illinois and Many North-Central Areas

Reports of soybean aphid infestations remain very low across Illinois. To date, I have not received any reports of fields reaching the economic threshold and requiring a treatment. This trend continues despite the very mild summer we have had so far. Based on a July 27 teleconference with other extension entomologists, the main challenges presented by soybean aphids this season have occurred in Ontario. August is still in front of us, and we know that aphid populations can build very rapidly; however, for now let's hope that the natural enemies keep aphid densities in check. If any readers are aware of treatments being applied for soybean aphids, please share these observations with me. Thanks.--Mike Gray

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