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Larger refuges needed to sustain success of transgenic corn
Date:6/8/2012

and to decrease insecticide sprays, but evolution of resistance by the pests can diminish or even eliminate these benefits." said Dr. Tabashnik. "To delay pest resistance and sustain the benefits of Bt corn, we recommend planting more corn that does not produce Bt toxins active against rootworms. This approach, called the refuge strategy, allows the susceptible pests to survive and has worked to slow resistance of other pests to Bt crops."

"Most of the corn seed currently produced in the U.S. is transgenic and includes genes for insect control," said Dr. Gould. "Enlarging refuges will require more seed without corn rootworm control genes. This shift in production will take time, so this process should begin immediately."

In addition to increased refuge sizes, the authors write that the best way to postpone resistance is to use IPM, in which Bt corn is combined with other control tactics such as crop rotation and judicious use of insecticide sprays.


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Contact: Bruce E. Tabashnik
brucet@cals.arizona.edu
520-621-1141
Entomological Society of America
Source:Eurekalert

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