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Corn rootworms are adaptive, changing to meet shifting production practices, technology, and climate. With the development of resistance to Bt-RW corn, corn rootworms now pose a challenge for most corn growers. With higher yields and corn prices, greater input costs, and tighter planting and harvesting schedules, corn growers have more outcome than ever riding on their corn rootworm management decisions. Technology offers a simple solution, transgenic corn resistant to corn rootworms, but debate swirls around the use of this technology, its impacts on corn rootworms populations, and the prospects of resistance. Reports of performance problems with Bt rootworm traits surfaced in 2009 and seem especially challenging in 2012. What is happening to corn rootworm populations? Has resistance developed to Bt rootworm traits? Are the risks of corn rootworm attack shifting? What does this mean for corn rootworm management decisions this summer and for 2013?

Kenneth Ostlie
Professor and Extension Entomologist
University of Minnesota
Department of Entomology
1980 Folwell Ave., Rm. 219
St. Paul, MN 55108-6125
Cell: (612) 750-0993
Office: (612) 624-7436
Fax: (612) 625-5299
Email questions on corn rootworm