Control of the Cabbage Looper and Imported Cabbageworm on Collards, 1982

'Vates' collards were direct seeded in 4 row plots 37.5 ft long on Jul 8. Plants were spaced 6-8 inches apart in the row and 36 inches between rows. Each plot was buffered by 2 guard rows. 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 Aug 13, 18, and 25; Sep 2. 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.