Abstract
Bay SRA 7660 [phenylghyoxylonitrile oxime( O )- O, O dimethyl phosphorothioate] was tested on soft winter wheat as a protectant against adult rice weevils, Sitophilus oryzae (L.), red flour beetles, Tribolium castaneum (Herbst), confused flour beetles, T. confusum Jacquelin duVal, and lesser grain borers, Rhyzopertha dominica (F.). Results were evaluated at intervals during 12 months by counting dead insects after 21 days’ exposure to treated wheat. Bay SRA 7660 at 5 ppm was effective for 9 months against the rice weevil, for 2 months against red and confused flour beetles, and for 6 months against lesser grain borers. Its effectiveness at a dose of 10 ppm against the lesser grain borer equalled the protection afforded by malathion; however, the recommended dosage of ca. 10 ppm malathion gave superior protection from the other 3 species than that given by Bay SRA 7660.
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