Northern corn rootworm resistance is happening in the most common Bt traits in southeastern North Dakota. NDSU Extension entomologist Jan Knodel says resistant corn rootworm beetles were found at Sargent and Ransom Counties. Knodel says scouting and rotation are key methods of controlling corn rootworm. “If you have high numbers of adults in your count and also a lot of damage on the roots, then you have to either go with a pyramid Bt corn hybrid or use soil insecticide next year.”
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