Search

Corteva Agriscience recently confirmed resistance to the Cry34/35Ab1 Bt protein in Delaware County. 

Three of four Bt traits targeting corn rootworm (Cry3Bb1/Yieldguard rootworm; mCry3A/Agrisure RW; and eCry3.1Ab + mCry3A/Agrisure Duracade) are not reliable for rootworm control due to widespread resistance. Due to a reduction in effectiveness of the Cry3 proteins, farmers have come to rely upon Cry34/35Ab1 for rootworm protection, placing significant selection pressure on this trait.

By Paul Lasley, Iowa State University Sociologist

In my last editorial I argued that group action is required if we are to effectively manage field crop pests by concluding, “Some things are too big for anyone to accomplish alone and too important not to try to do together.”  

There is little doubt that productivity gains in corn and soybeans can be attributed, in part, to better pest management, which often relies upon herbicides and insecticides. However these pesticides are becoming less effective.

The U.S. Environmental Protection Agency (EPA) recently released two pesticide registration notices (PRNs) that impact how technology providers, crop advisers, and producers manage resistance. These documents are in addition to a new framework to address Bt resistance in corn rootworm released in 2016. These releases, which all went through public comment, provide guidance in managing resistance and support the strategies and goals of the Iowa Pest Resistance Management Program (IPRMP).

LOGAN, IOWA—The Harrison County Herbicide Resistance Project will hold a field day Monday, June 18^th.  Join us from 9:30 am to 11:00 am at the corn test plot at the farm operated by Larry Meyer southwest of Modale to observe weed management field trials and learn about implications for resistance management. This event is free and open to the public.  Refreshments will be provided.