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Natural refuges delay Bt resistance

Research by US and Chinese scientists shows that the development of resistance by cotton bollworms (Helicoverpa armigera) to Bt toxins produced by genetically modified insect-resistant cotton can be delayed by the presence of non-Bt crops on which the pest feeds. While farmers in the US plant specific non-Bt cotton refuges to delay resistance, this approach has not been necessary in China because of the presence of non-Bt crops such as maize, soybeans and peanuts in Bt cotton-growing areas.

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