Boll Weevil: Suppression with TH-6040 Applied in Cottonseed Oil as a Foliar Spray123

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Abstract
In the laboratory, Thompson-Hayward TH-6040 (N-4-chlorophenyl)-N′-(2,6-difluorobenzoyl) urea) formulated in cottonseed oil and applied to cotton plants was effective in preventing hatch of eggs laid by female Anthonomus grandis Boheman for 4–7 days after the females were exposed. In the field, TH-6040 (0.25 AI/acre) in cottonseed oil applied every 4 or 5 clays from initiation of squaring in mid-June until late Aug. either caused all eggs to fail to hatch or caused emerging larvae to die in the 1st instar. As a result, no 1st field-generation boll weevils could be detected by in-field trapping until Aug. 20. Even then, the population was very low and could be attributed partially to rainfall that washed off 2 successive treatments of TH-6040 in late July.

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