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‘Hiratsuka’ Chinese cabbage was seeded into 20-ft, 2-row beds, having 22-in row and 12-in interplant spacing on 10 July, 1981. The Ritzville silt loam (Calciorthidic Haploxerolls) soil had 1.6% organic matter and a pH of 6.2. Pounce was applied at 0.05, 0.1, and 0.2 lbs (AI)/acre on 4, 12, 18, and 24 Aug., and 2, 8, 15, and 22 Sept, using a boom sprayer mounted on a tractor travelling at 2.75 mph. The treatments were applied in 40 gal/acre at 60 lb/in2 through D2-25 TEEJET nozzles spaced 11 in apart on the boom. Experimental design was a randomized complete block with four replicates. Plots were sprinkler irrigated as needed but not less than 48 h after a treatment and at a rate of ca 0.375 acre-in/h. Efficacy was determined by examining 10 heads from each plot 3 days after the final treatment for the abundance and distribution of both aphids and worms. Phytotoxicity was determined at the same time.

Efficacy of Pounce on Chinese Cabbage for Control of Green Peach Aphid and Bertha Armyworm, 1981