Soybean aphid populations continue to climb in northeastern Iowa, as reported by Brian Lang, extension field crops specialist. As of July 6, almost all of the plants in a sentinel field were infested with aphids. The average soybean aphid population was 179 aphids per plant, still below the economic threshold of 250 aphids per plant. Near Ames in Story County, populations also are building.
Iowa State University
Rice, Marlin E., "Soybean aphids -- next two weeks critical" (2005). Integrated Crop Management News. 1460.
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