Last week we reported that small populations of soybean aphids were being found in Minnesota and Wisconsin. In Iowa, after our students and summer helpers checked thousands of soybean plants last week, the first soybean aphids (and it was just three) were found near Ames in Story County. Brian Lang, extension field crops specialist, also reports finding small populations of aphids in northeastern Iowa near Decorah. No soybean aphids were found in research plots in Floyd and Lucas counties. So the aphid population in Iowa this spring appears to be progressing "normally" and as expected so far--populations are very small and widely scattered. However, the same cannot be said for soybean fields to the east of us.
Iowa State University
Rice, Marlin E. and O'Neal, Matthew E., "Early soybean aphid outbreak--to the east" (2007). Integrated Crop Management News. 1056.
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