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Economics of COTMAN Insecticide Termination in Bt and Boll Weevil Eradication Systems

Diana M. Danforth, Mark J. Cochran, Ray Benson, Greg Smith, Tina Gray Teague, and Jeremy Greene


The COTMAN insecticide termination rule for fruit-feeding insects was developed and validated in the years preceding the availability of Bt cotton varieties and in production systems with boll weevils. The objective of this study was to compile results from insecticide termination trials in Arkansas conducted on Bt varieties and in Boll Weevil Eradication systems.

COTMAN Insecticide Termination Rule for Fruit-Feeding Insects
Monitor crop to identify the last effective boll population (cutout). Physiological cutout is signaled when field average Nodes-Above-White-Flower equals five.

Accumulate daily heat units (DD60’s) starting at cutout.

Stop insecticide applications for bollworm, tobacco budworm and boll weevil infestations that occur after bolls have accumulated 350 heat units.

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Document last modified 04/27/04