Foliar Treatments To Control The Cabbage Looper in Collards, 1976

Votes collards were direct seeded in 3 ft rows on May 25, 2976, and thinned to 10 inch spacing 1 month later. Treatment plots were replicated 3 times and arranged in a randomized block design. Each plot consisted of a single 30 ft long row with an untreated row adjacent to each treatment plot. Insecticides were applied with a trailermounted Hudson Porta Power Sprayer at the rate of 100 gal/acre at ca. 250 psi, using 6 Myers Fembro nozzles '6251A ('2 discs) per row. Two nozzles were placed directly over the center of the row and 4 nozzles, 2 spaced about 8 inches apart on drop-lines on each side of the row, directed inward. Applications were made on August 4, 11, 17, 24, and 30. Treatments were evaluated by counting the number of loopers per 10 collard plants or by foliage injury ratings. Foliage injury ratings ranged from 1 to 5 and were categorized as follows: 1) Only occasional feeding — necessary to look very close to see evidence of injury; 2) Visible signs of feeding but less than 10% of leaves severely damaged; 3) Heavy feeding on 25% of foliage; 4) Intense feeding on 50% of foliage; and 5) Practically 100% of the foliage severely injured — plants nearly defoliated.