Abstract
Aircraft applications of malathion, applied as a lowvolume concentrate spray and in a conventional water-emulsion spray, were compared for effectiveness against cotton insects in a field test conducted in Pinal County, Ariz., during July 1964. In both cases malathion was applied at the rate of 1.25 lb of actual toxicant per acre. The total amounts of formulation applied per acre were 1 pint for the low-volume concentrate spray and 5 gal for the water emulsion spray. The low-concentrate spray was applied to a single 40-acre plot, using a plane equipped with 5 equally spaced D-4 orifice nozzles, flown at a height of 30 ft, with swaths 70 ft wide. The water-emulsion spray was applied to a 14-acre plot with a conventionally constructed aircraft, flown immediately above the cotton plants, with swaths 40 ft wide. An adjacent 14-acre plot was left untreated. Results were measured by standard sweep-net counts of insects present. In the 40-acre low-volume concentrate plot, 9 samples of 100 net strokes each were taken. In each of the 14-acre plots used for comparison 3 similar samples were taken. Plots were sampled by this method 2 hr before treatment and 3 and 10 days after treatment.
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