Control of Thrips Tabaci on Cabbage, 1996

Abstract

Abstract Cabbage was transplanted on 27 Jun at the Vegetable Crops Research Farm near Geneva, NY. To increase populations of thrips, a 5-ft strip of oats was planted along the length of each side of the experimental area. Plots consisted of two 10-ft rows on 36-inch centers with 18-inch plant spacing. Treatments were replicated 4 times in an RCB design. A backpack sprayer with a one-row boom, having 3 nozzles per row with HC 12 hollow cone tips, and delivering 30 gpa at 40 psi and 2 mph, was used to apply weekly applications of each treatment. Javelin at 1.0 lb./acre was added to Admire and the check treatments to control Lepidoptera and insure readable plants at harvest. Silwet sticker-spreader was applied at 0.1 % v/v with all foliar treatments. Admire was applied only on 7 Jul. Metasystox-R treatments were applied only on 6, 13 and 20 Sep. Provado was applied only on 6, 13, 20, 26 Sep and 1 Oct. Other treatments were applied on 7, 14, 22, 30 Aug, 6, 13, 20, 26 Sep 1, 10 and 17 Oct. Harvest evaluations for thrips were made on 28 Oct. Evaluations for thrips damage were made by randomly selecting 2 mature heads per plot, cutting them in half along the core, and peeling back 10 layers. Each layer was assessed for the presence of thrips damage. For layers damaged, we used the average number of layers per two plants in a replicate and then analyzed these averages. Data were analyzed by a two-way ANOVA.