Abstract
In field tests conducted in 1965 with ultra-low-volume (undiluted) technical insecticides, malathion at 4-16 fluid oz per acre and Methyl Trithion® ( s -[[ ( p -ehlorophenyl)-thio]methyl] O, O -dimethyl phosphorodithioate) at 6 or 12 fluid oz per acre applied in 50- or 75-foot swaths from fixed-wing aircraft controlled the boll weevil, Anthonomus grandis Boheman. Malathion at 12-16 fluid oz per acre applied in a 50-foot swath controlled a light infestation of the bollworm, Heliothis zea (Boddie), and suppressed populations of the cotton aphid, Aphis gossypii Glover, and the carmine spider mite, Tetranychus telarius (L.). However, it was less effective against these pests when it was applied in a 100-foot swath. Methyl Trithion applied at 6 or 12 fluid oz per acre in 50- or 75-foot swaths suppressed populations of cotton aphids and the carmine spider mite but gave poor control of the bollworm. In small-cage field tests, although malathion and Methyl Trithion were initially effective against the boll weevil, they were not effective longer than 48 hours.
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