Laboratory Evaluation of TH 6040 Against the Pink Bollworm123

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Abstract
First-instars and adults of Pectinophora gossypiella (Saunders) were exposed to Thompson-Hayward TH 6040 [Dimilin®; N-(4-chlorophenyl)-N'-(2,6-difluorobenzoyl)-urea] in either diet or on treated surfaces. One ppm in larval diet reduced the emergence ca. 64% from control levels, and greater doses greatly reduced larval development. However, exposure of 1st instars for 24 h to a bait formulation containing 10,000 ppm of TH 6040 on cotton leaves reduced the number of larvae surviving to the 5th stage by 25%. Continuous exposure of adults to TH 6040 either in diet or on treated surfaces caused a gradual loss of fertility during a 4-, to 6-day period. Larvae from treated parents developed normally.

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