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Cabbage Looper Control on Cabbage in Louisiana, 1986


 The study was conducted at the Hill Farm, Louisiana Agricultural Experiment Station, Louisiana State University, Baton Rouge, LA. Seedling cabbage was transplanted onto 38-inch rows on 17 Feb with 15 inch spacing between plants. Plots were arranged in a randomized complete block design with 4 replications of single row plots containing 10 plants. Pesticides were applied with a hand-held CO2 pressurized sprayer delivering 40 gal/acre at 40 psi through a single spray nozzle containing a D-3 disc, No. 25 core, and 16 mesh strainer. Treatments were applied on 7, 21 Apr and 7 May. Evaluations of cabbage looper damage were made on 16 May by: (1) counting the number of feeding holes > 2 cm2 in each of 6 wrapper leaves in each plant, and (2) visually inspecting the head for damage and rating it damaged or undamaged. The leaf rating was calculated as the mean number of holes per leaf, while the head damage was expressed as the percentage of heads damaged.