The Problems Driving Resistance to Bt Crops—and Some Proposed Solutions

By: DOMINIC REISIG, Entomology Today | Bt crops—those genetically engineered to produce an insecticidal toxin from the bacterium Bacillus thuringiensis—are special due to their benefits: reducing foliar insecticide applications, which increase populations of beneficial insects and minimize environmental harm; reducing pest populations throughout the landscape; and preserving yield, to name a few. Therefore, preventing resistance to Bt crops is important and is usually formalized in a set of Insecticide Resistance Management (IRM) practices. Because bollworm is now resistant to two Bt toxin families in cotton, IRM practices may have to change to slow resistance to other Bt toxins....

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