Control of Lepidopterous Larvae on Fall Cabbage, 1989

Cabbage transplants were planted on 30 Aug at the Eastern Shore Agricultural Experiment Station, Painter, VA. Each plot consisted of 2, 25-ft rows bordered on each side by an untreated row. Cabbage was transplanted with 17-inch plant and 36-inch row spacing. Treatments were replicated 4 times in a randomized complete block design. Sprays were applied with a propane compressed-gas backpack sprayer using three hollow-cone nozzles/row and delivering 70 gal water/acre at 40 psi. Applications were made weekly beginning 12 Sep through 12 Oct. Evaluation criteria consisted of direct visual counts of the number of DB, CL, ICW, and BAW on 5 randomly chosen plants/treatment plot. On 7 Nov, damage ratings were determined as in Greene et al. (J. Econ. Entomol. 62(4):798-800). Plants with a damage rating of 3 or below were considered marketable.