Based on reports from my Extension agronomist colleagues, hundreds of thousands of soybean acres were sprayed with insecticides during July and August for control of soybean aphids and bean leaf beetles. All insecticides listed in Table 1 have at least a 21-day preharvest interval, and several have moderate intervals of 30 days or very long preharvest intervals of 60 days. The preharvest interval is the minimum number of days a farmer must wait before harvesting a treated crop.
Iowa State University
Rice, Marlin E., "Producers and Applicators Legally Responsible to Heed Preharvest Intervals for Treated Soybean" (2008). Integrated Crop Management News. 783.
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