Extension crop specialist reports from across the state indicate that for the third week of May, bean leaf beetles were causing the most injury to soybean in central, south central, southwestern, and western Iowa. Very few problems were reported from the rest of the state. Early-emerging soybean attracted large populations of the overwintered beetles and their feeding was heavily scarring the cotyledons and defoliating the young leaves.
Iowa State University
Rice, Marlin E., "Soybean fields hit hard by beetles" (2001). Integrated Crop Management News. 1862.
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