Foliar Sprays Applied at Egg and Larval Thresholds to Control Boll Worms in Cotton, 1993

Cotton was planted on 24 May at the Eastern Shore Agricultural Experiment Station, Painter, VA. Row spacing was 36 inches, and Temik I5G (5 lb product/acre) was applied at planting for early-season Thrips control. Each plot consisted of a double 25 ft row, bordered on each side by an untreated guard row, and replicated 4 times in a RCBD. Sprays were applied using a single nozzle (TX-VS 4) boom delivering 10 gal water/acre at 60 psi. Egg threshold sprays were applied on 13 Aug when 10 or more BW eggs were found on 100 terminals. Larval threshold sprays were applied on 26 Aug when BW numbers reached or exceeded 3 live worms/100 bolls or squares. BW pressure was low to moderate. On 6 Sep, 25 random bolls were picked from each replicate of each treatment and examined for BW feeding damage.