MSU Weed Science - Department of Crop and Soil Sciences
Apr 20th, 2014


Field Crops Entomology Program
Michigan State University

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For regional field crops information, visit Purdue's Chat 'n Chew Cafe

Corn rootworm resistance to Bt: 
Update on field failures in Michigan &
recognizing and combating the problem

Rootworm resistance to Bt corn has been confirmed in western states like Iowa and Minnesota, and in 2012 suspicious field failures were sampled in Michigan and New York. Now is the time to become familiar with the risk factors and symptoms of field failures, and to learn what to do about it. Nine entomologists from universities in the eastern corn belt (Purdue, MSU, Ohio State, Penn State, Cornell, University of Guelph) cooperated to develop a consensus recommendation for our region, which focuses on CROP ROTATION. Our goal is to preserve the usefulness of Cry3Bb1 and other rootworm Bts for you and your customers for as long as possible.

There are some opportunites this winter to learn more about rootworm resistance:
**Special free meeting for agribusinesses and producers managing continuous corn - Managing Corn Rootworm in Intensive Corn Production Systems. January 21, 1-3pm, Smith Hall, Clinton County fairground, St Johns MI.  Dr. Chris DiFonzo, Field Crops Entomologist with Michigan State University, will discuss the corn rootworm resistance situation in Michigan. A panel of agronomist from industry will provide information on their Bt traits. In addition, management strategies for intensive corn production will be discussed.

**Rootworm resistance will also be discussed at field crops meetings across the state: Feb 13 in Peck, Feb 19 in Lawrence, Feb 20 in Frankenmuth, Feb 21 at Cabalas. For details, click the 'extension' tab to the right.

Learn more about the causes, identification, and management of Cry3Bb1 resistance:
**Read the WHITE PAPER prepared and submitted to EPA by 9 entomologists in the eastern corn belt
**Download a four-page BULLETIN that summarizes our recommendation for producers
**View a SLIDE SET about the current state of CRW resistance in Michigan
**Listen to the NPR REPORT from July 9th, As Biotech Seed Falters, Insecticide Use Surges in Corn Belt