Efficacy and Yield Evaluations of Resmethrin Treatments on Cucumber, 1984

Semi-bush type cucumber transplants were raised in a soilless media in the greenhouse facilities of VPI & SU, Blacksburg, VA. After a whitefly infestation was established on the plants in the greenhouse, they were transplanted 14 and 15 Jun on black plastic in a lodi loam soil field on the VPI & SU Hortic. Res. Farm near Blacksburg. Plots were arranged in a randomized complete block design replicated 4 times. Each replicate consisted of three 30-ft rows with 10 plants per row (3-ft plant spacing). Row placement was 7 ft with 5-ft alleys between replicates. Two rates of resmethrin 26% EC were applied on the following dates: 25 Jun, 3 Jul, 9 Jul, 16 Jul, 27 Jul, 2 Aug, 10 Aug, 17 Aug, and 31 Aug. A compressed air sprayer was used for placement of the insecticide over each treated row of plants. One Teejet 8003 fan-type nozzle, delivering 20 gal/acre at 30 psi, was used on 25 Jun and 3 Jul. Two Teejet 8004 fan-type nozzles (30-inch boom nozzle spacing), delivering 50 gal/acre at 30 psi, were used for all other application dates. Maintenance fungicide treatments were also applied, separately from the insecticide treatments, on each application date. They included: Bravo 500 g/1 at 2.75 pt/acre (25 Jun-31 Aug) and Bayleton 50 WP at 2.0 oz/acre (10 Aug-31 Aug).