Control of Cabbage Looper and Imported Cabbageworm on Collards, 1984

Collards were direct seeded in 4 row plots 35 ft long on 16 Jul ’84. Plants were spaced 4 inches apart in the row and 36 inches between rows. Each 2-row plot was buffered by a guard row. 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 10 gal of water and applied with a custom built row crop sprayer. Each row was covered by 3 drop nozzles delivering 50 gal/acre at 90 psi. Treatments were applied on 21 and 29 Aug; 6, 11 and 18 Sept. Foliage injury ratings ranged from 1-5 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.