The soybean aphid has been a pleasant disappointment this year. While many of us were anticipating a repeat performance of widespread, economically damaging populations in 2004, the soybean aphid, for whatever reason, has fizzled. The aphid can be found throughout much of Iowa, but nearly all field reports are that populations are way below the economic threshold of 250 aphids per plant. The one reported exception is in Marion County. Steve Crozier, Smith Fertilizer and Grain, reported he was finding more than 50 percent of the plants with more than 250 aphids, and 500 aphids per plant was not uncommon.
Iowa State University
Rice, Marlin E., "Soybean aphids: no widespread problems" (2004). Integrated Crop Management News. 1581.
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