Soybean aphid found on beans in Minnesota

Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.

And to follow up on the previous article about suction traps, here is the latest update on soybean aphid in soybean.  Dave Ragsdale from the University of Minnesota reports that soybean aphid was found in multiple locations throughout Minnesota on V1 soybeans. The earliest find was in mid-May on volunteer beans along the Minnesota River in south-central Minnesota. Soybean aphid was later found at the end of May in commercial soybean in northwest Minnesota (Dave says this is a good two to three weeks earlier than ever recorded in that part of the state.) and in a research plot south of the Twin Cities.

In Michigan, I haven’t found any aphids on beans yet. This is in contrast to last year, when I had already had 1 to 5% infested plants on the MSU Crop and Soil Sciences Farm on June 2.  Recall the suction trap data from fall 2005.  Michigan had very low fall flight, but some traps in Minnesota and Iowa had high fall flight. If our spring colonization is very low, and Minnesota’s is moderate-high, that is good evidence that the suction trap data is predictive of the following year.

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