Abstract
Abstract Tests were conducted at 2 locations against beet armyworm in nonirrigated cotton planted 15 May on heavy clay soil at the USDA Mechanization Farm, Stoneville, Miss. Plots were 8 rows (40-inch centers) by 50 ft, separated by 15-ft alleys. Treatments were arranged in a randomized complete block with 4 replicates/treatment. Treatments were applied 9 Aug by a high-clearance spray machine equipped with a compressed-air spray system. Total spray volume was 5 gal/acre at 5 mph and 40 psi using 2 TX6 nozzles/row. Plots within a replicate were sprayed consecutively with the boom rinsed twice and blown clear between plots. Pretreatment random scouting had shown a moderate infestation of beet armyworm throughout both fields (19.9 ± 9.6 beet armyworms/5 row ft). Counts of beet armyworm larvae were made 72 h after treatment using a drop cloth and visual search of plants on 5 ft of row in each plot.
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