Diflubenzuron for Control of the Boll Weevil in Unisolated Cotton Fields

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In a 1976 test in unisolated cotton fields, different rates (35, 70, and 140 g AI/ha) of the insect growth regulator diflubenzuron, N-[[(4-chloropheny)amino]carbonyl]-2,6-difluorobenzamide, were applied aerially over a 6-wk period to suppress populations of Anthonomus grandis Boheman. There was a pronounced dosage rate response to the chemical in that the percentage emergence of adult weevils from cotton squares collected from treated fields averaged 37.7, 22.2, and 15.8% at the lowest, median, and highest rate, respectively. Adult emergence from squares collected in untreated control plots averaged 70% during the same period. The reduction in weevil emergence was most pronounced in the F1 generation and somewhat less in the F2 and F3 generations. A similar emergence pattern was observed in 1977 but due to a delay in the initial treatment the effect lagged by 1 generation. In both years, there was an apparent rebound by pest populations during the latter part of the season as indicated by increased emergence from the field collected squares. This result was attributed to movement of untreated weevils into the treated fields.

Document Type: Research Article

Publication date: October 15, 1978

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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