Control of the Cabbage Looper and Imported Cabbageworm, 1975

Abstract

Abstract ‘Early Round Dutch’ cabbage was transplanted in 2-row plots 33-feet long on August 21’75. Plants were spaced 18-inches in the row with 36-inches between rows. Each plot was buffered by 2 guard rows and the treatments were arranged in a randomized complete block design with 4 replications. The soil was a Norfolk “A” loamy sand. All spray treatments were mixed in 1.5 gallons of water and applied at the rate of 25 gal/a with 40 psi. Treatments were applied with a wheelbarrow-type sprayer using CO2 for spray discharge. The spray boom was equipped with drop nozzles and each row was covered by 3 nozzles. The sprays were applied on Sep 5, 16 and 29; Oct 8 and 13. The granular insecticide treatments were applied with a double spout electric drive Gandy applicator (Model 901-2). The treatments were applied 4-6 inches on either side of the row by placing the Gandy hose outlets behind the inside cultivator teeth. Plots receiving sidedressing were treated on Sep 5 and Oct 7. Foliage injury ratings ranged from 1 to 5 and were indexed as follows: 1) 0-3% damage - odd holes on leaves; 2) 4-10% damage - few leaves with holes; 3) 11-25% damage - moderate number of leaves with holes; 4) 26-50% damage - most leaves with holes; and 5) 51-100% damage - crown damage and/or all leaves with holes.