The EPA is requiring Monsanto to ensure that 20 percent of the planted acreage of YieldGard® Rootworm be set aside where non-Bt corn will be grown to serve as a refuge. These refuge acres will support populations of corn rootworm not exposed to the Bt protein and reduce the possibility of corn rootworm developing resistance to Bt corn.
Iowa State University
Rice, Marlin E., "YieldGard® Rootworm corn requires a refuge" (2003). Integrated Crop Management News. 1635.
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