by Greg LaBarge, Fulton County
With more insect traited corn hybrids on the market and different refuge requirements depending on the trait plus new in the bag options to say the least it confusing to manage the refuge requirements today. The issue is important as the first reports of field-evolved resistance to a Bt toxin by the western corn rootworm and by any species of Coleoptera in Iowa this past year. The research findings of this find can be found at http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0022629
Chris DiFonzo (Michigan State University) and Eileen Cullen ( University of Wisconsin) have put together a chart of traits from all the major companies with the insect control that can be expected and the refuge requirements for that product. As you work through planning for next season this guide helps you understand what you need to do to prevent insect resistance.