Control of Lepidopterous Larvae on Cabbage, Spring, 1990

On 14 May 1990, 'Express' cabbage transplants were planted into sandy loam soil at the Wes Watkins AREC, Lane, Okla. Test plots were 20 ft long, single-row with 3 ft between rows. Plants were spaced 12 inches apart with one unplanted row between planted rows. A randomized complete block design was used with three replications. Fertilizer was applied at recommended levels before planting and through a trickle irrigation system. The initial insecticide treatment was applied on 20 Jun using a CO2-powered backpack sprayer which delivered 23 gal/acre. Ten randomly selected plants/plot were sampled for CL and DBM one d before treatment, 2 DAT, 7 DAT and 13 DAT. A second insecticide application was made on 9 Jul with samples taken as before at 3 DAT and 7 DAT.