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Scientists offer recommendations for delaying resistance to Bt corn in western corn rootworm
Date:11/26/2013

oach to IRM is not necessarily optimal for all insect pests," according to the authors, who recommend that growers use the following IPM approaches to delay further rootworm resistance to Bt corn:

  • Rotate to soybean or other crops to break the corn rootworm life cycle between growing seasons.

  • Occasionally rotate to a non-Bt corn hybrid and consider use of a rootworm soil insecticide during planting.

  • Consider using corn that contains different Bt proteins than ones that may have performed poorly in the past.

  • Consider using pyramided Bt hybrids, which is defined as corn that contains multiple Bt proteins targeting corn rootworm .

  • If crop rotation is not an option and corn containing multiple Bt proteins is not available, suppression of rootworm adults by using insecticides for one or two growing seasons may be an appropriate remediation step.

  • Most importantly, implement a long-term integrated approach to corn rootworm management, based on scouting information and knowledge of corn rootworm densities, that uses multiple tactics such as rotation with other crops, rotation of Bt proteins, and the use of soil insecticides at planting with a non-Bt hybrid. Integration of tactics across seasons is fundamental to prolonging the usefulness of any effective management strategy.


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Contact: Richard Levine
rlevine@entsoc.org
301-731-4535
Entomological Society of America
Source:Eurekalert

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