Scouting reports indicate that soybean aphid numbers are increasing in a few Iowa locations—most notably in northeastern Iowa. Brian Lang, extension field specialist, Decorah, notes that a field near Waukon averaged 30 to 40 aphids per plant with some plants more than 200 aphids per plant, but less than 50 percent of the plants were infested.
Rice, Marlin E., "Soybean aphid counts highest in northeastern Iowa" (2005). Integrated Crop Management News. 2381.