The Handy Bt Trait Table recently was updated, as well as an updated list of citations for Bt resistance. Access the updated 2019 table at texasinsects.org. In the table, there are changes that reflect two more findings of Bt resistance.

European corn borer resistance was found to single-trait Cry1F Bt hybrids in Canada. ECB was added to the resistance column for each trait package that has Cry1F alone. Michigan State University is interested in feedback about using single-trait Bt hybrids in Michigan — if they are being sold or planted.

Bt resistant northern corn rootworm populations were confirmed in North Dakota. Resistant populations of western corn rootworms (the species with the black stripes) already have been found to all types of Bt.

There were a few field failures in Michigan in 2011-12. This is the first time that Bt resistant northerns have been found. Although westerns are the most common species in Michigan, full fields of northerns have been found. In the trait table, species are separated as WCR and NCR.

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