Product. Toxin. Target Pest. Yieldgard Rootworm. Cry3Bb. CRW. Yieldgard Plus. Cry3Bb + Cry1Ab. CRW, Lepidoptera. Herculex Rootworm. Cry34Ab1/Cry35Ab1. CRW. Herculex Xtra. Cry34Ab1/Cry35Ab1 + Cry1F. CRW, Lepidoptera. Insect Resistance Management for Corn Rootworm
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Cry3Bb + Cry1Ab
Cry34Ab1/Cry35Ab1 + Cry1F
Insect Resistance Management for Corn Rootworm
Alan Reynolds, Sharlene Matten, and Tessa Milofsky
U.S. EPA/Office of Pesticide Programs, Biopesticides and Pollution Prevention Division (7511C)
1200 Pennsylvania Avenue NW, Washington DC 20460
As with other Bt crops, EPA has required Insect Resistance Management (IRM) strategies for Bt corn crops targeting corn rootworm (CRW, Diabrotica sp.). IRM is needed due to the risk of resistance from sustained, season-long expression of high levels of Bt toxins. The preferred strategy involves the use of refuges to produce susceptible beetles to mate with any resistant beetles from the Bt crop. For additional information, see EPA’s biopesticides web site: www.epa.gov/pesticides/biopesticides.
Information Used to Formulate IRM Strategies for CRW
Currently Registered Rootworm Products
A structured refuge is strategic planting of non-transgenic (non-Bt) crops in close proximity to the Bt crop to promote interbreeding of resistant and non-resistant insects. The goal is to reduce chances that resistant beetles mate with each other by providing large numbers of susceptible beetles from the refuge (non-Bt crop).
TARGET = 500 susceptible to 1 resistant