The soybean aphid population at the research site in northeastern Iowa near Decorah exceeded the economic threshold of 250 aphids per plant the first week in July. According to information provided by Brian Lang, extension field agronomist, the population jumped from 30 per plant on June 28 with 95 percent of the plants infested to 405 per plant on July 5 and 100 percent of the plants infested. The population trend is not as great as the outbreak year of 2003, but it certainly is tracking to be a bigger aphid year than in 2005 (Table 1).
Rice, Marlin E. and O'Neal, Matt, "Soybean aphids exceed the economic threshold in northeast Iowa" (2007). Integrated Crop Management News. 2421.
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