Efficacy of Lorsban on Kale for Control of Cabbage Maggot, 1981

‘Vates Blue Curled’ kale was seeded into 25-ft, 2-row beds having 22-in row and 16-in interplant spacing on 20 May. The Ritzville silt loam (Calciorthidic Haploxerolls ) soil had 1.6% organic matter and a pH of 6.2 Lorsban was spray banded over the planted row at 0.8, 1.6, and 3.2 fluid oz/1,000 ft of row on 20 May, and again on 17 June, 30 days preharvest. The seeder and tractor mounted TEEJET 8005E nozzles applied 80 gal/acre at 60 lb/in2 while moving at 2.1 mph. Experimental design was a randomized complete block with four replicates. Plots were sprinkler irrigated as needed with a rate of 0.375 acre-in/h. Efficacy was determined at harvest by examining 16 roots/plot for insect damage. Phytotoxicity (stand loss) was determined at thinning, ca 4 weeks after planting.