Abstract
Low-volume ground equipment was evaluated for its ellectiveness in insect control. The control of corn earworm, Heliothis zea (Boddie), using low-volume forumlations of endosulfan-malathion, DDT-malathion, and 50-8447 (2-chloro-I-(2,4,5-trichlorophenyl) vinyl dimethyl phosphate) was equal to that obtained with 2 lb per acre of DDT emulsifiable concentrate. Corn earworm control with a pneumatic (F-l) nozzle with air plus charge and a flat fan (650017) nozzle was not significantly different when varying rates of malathion and SD-8447 were used, but both types of nozzles were significantly better than the DDT standard or the 1,-1 nozzle without air plus charge. Residues of low-volume DDT-malathion showed a 3-12 ppm DDT increase and a 4-24 ppm malathion increase from the first to the second application. with no additional increase shown for the remaining 3 applications. Seven days after the fifth application, residues declined to 6 and 0.8 ppm for DDT and malathion, respectively.
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