Evaluation of Pyrethroids and Organophosphorus Compounds for Heliothis Spp. Control in Mississippi, 1987

Fourteen treatments were tested for relative efficacy against tobacco budworm in irrigated cotton planted 14 May at the Plant Science Research Farm, Mississippi State University, Mississippi State, Miss. Plots were 8 rows wide × 50 ft and were arranged in a randomized complete block design with 5 replications. Treatments were applied to the center 4 rows by high-clearance spray tractor equipped with a compressed-air plot spray system calibrated for 5 gal/acre at 4 mph using 3 TX-3 nozzles/row. Applications were made on 22 Jul and 6 and 15 Aug. All plots received insecticide treatments for nontarget pests as needed during the season. Data were obtained by examination of 10 terminals and 50 squares/plot or by whole-plant search of 10 plants. All data were collected from the center 2 rows. Bolls were counted in lieu of harvest because of early frost and other conditions.