Handy Bt Trait Table for U.S. Corn Production

The following content lists the types of Bt present in all commercialized corn in the U.S.A. in a concise format. It presents the trade names for traits, Bt event, protein(s) expressed, targeted insects and herbicide traits.

Now in its 15th year, this table has become the standard as an authoritative reference to Bt toxins in corn. Dr. Chris DiFonzo at Michigan State University is the primary author, and questions or comments should be directed to her. If you would like to reprint the table in a local publication or  extension bulletin, contact Chris DiFonzo (difonzo@msu.edu or 517-353-5328) for a version modifiable for your state.  

The base publication has a column titled 'Resistance to a Bt protein in the trait package has developed in:' to highlight insect x Bt combinations with documented field-failures, confirmed resistance, or cross-resistance. These statements are based on published lab assays &/or field research. This column is intended to alert growers and consultants to potential management problems, influence seed selection, and encourage field scouting. Citations for resistance statements can be found here.

It is important to note that the Trait Table is a national publication and resistance may be widespread (as in western bean cutworm) or regional (as in corn rootworm). Check with your local seed company or extension personnel for the types of Bt resistance present in your area.

(Content posted 10 December 2017, Revised 20 December 2017)

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