Abstract
Abstract Cotton was planted on 11 May at the Eastern Shore Agricultural Research and Extension Center, Painter, VA. Each plot consisted of two 25 ft long rows planted on 3 ft spacing, and replicated four times in a randomized, complete block design. Each plot was bordered by an untreated guard row. Sprays were applied using a compressed gas backpack sprayer delivering 10 gal water/acre at 60 psi and equipped with a single nozzle (TX4) boom. Bollworm egg thresholds of 2 eggs/100 bolls and 5 eggs/50 terminals were exceeded on 5 Aug and the first spray applications were made on this date. The 5-day sprays were applied on 10 Aug, and the 10-day sprays on 15 Aug. Plots were then scouted weekly to determine if subsequent sprays were needed by examining 25 bolls per plot for live worms. Although egg threshold was no longer used after 5 Aug in making spray decisions, it was noted that egg threshold was exceeded in the as needed treatments on 9 Aug.
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