Mid-to-late July is the best time to examine corn rootworm injury to corn roots and to evaluate the performance of soil insecticides, seed treatments, or YieldGard Rootworm¨ corn. The rootworm larvae have done most of their injury by this time. Also, the corn roots have not yet had sufficient time to regrow new roots, which sometimes obscures the injury and makes it difficult to assess.
Iowa State University
Rice, Marlin E., "Rate corn roots for injury in July" (2003). Integrated Crop Management News. 1638.
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