Abstract
Abstract Thirteen treatments were tested for relative efficacy against aphids in irrigated cotton planted 17 May at the Delta Branch Experiment Station, Stoneville, MS. Plots were 8 rows by 50 ft and were arranged in a randomized complete block design with 4 replications. Treatments were applied to the 4 center rows of each plot by high clearance spray tractor equipped with a compressed air plot spray system calibrated to deliver 5 gal/acre using 2 TX-4 nozzles/row. Applications were made on 15 and 20 Jul. All plots received insecticide treatments for nontarget pests as needed during the season. Data were collected by picking 10 leaves at each of 3 levels within the canopy in each plot and aphids and thrips on ½ of each leaf were counted in the laboratory. Aphid numbers were generally distributed with higher numbers in the lower portions of the plant. There were no statistical differences within discreet levels between compounds as determined by analysis of variance and data from all levels were pooled for final statistical evaluation. Yield was obtained by mechanical picker from the center two rows within each plot.
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