Brian Lang, extension field specialist, Decorah, has been collecting weekly data on soybean aphids from northeastern Iowa during the past four years. The two tables show the percent of soybean plants with aphids and the average number of aphids per plant. Both of these categories show an aphid population that is slightly larger and occurring on more plants than at this same time last year. However, the population does appear to be much smaller than the outbreak population that we experienced during 2003.
Rice, Marlin E., "Aphid numbers up, but less than during 2003" (2005). Integrated Crop Management News. 2386.
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