Control of Lepidoptera by Ciba-Geigy Materials and Field Standards on Cabbage, 1993

Abstract

Abstract Cabbage was transplanted on 15 Jun at the Vegetable Crops Research Farm near Geneva, NY. Plots consisted of two 20-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 32.6 gal/acre at 40 psi and 2 mph, was used to apply applications of each treatment. Bond sticker-spreader was applied at 0.1% v/v with all treatments. To test against a population of Bt Kurstaki resistant diamondback moth, three plants per replication were inoculated on 13 Jul with 20 DBM second instar larvae per plant from our Bt Kurstaki resistant DBM lab colony. Imported cabbageworm and cabbage looper were natural populations. Treatments were applied on 9 Jul prior to inoculation and evaluations were made on 16 Jul. Evaluations were made by selecting the inoculated plants, removing all leaves, and counting the number of live larvae. A two-way ANOVA was used for analysis of Lepidoptera data using replicate totals. Subsequent weekly seasonal applications for natural populations of Lepidoptera were made on 20, 28 Jul, 11, 18, 27 Aug and 2 Sep. Evaluations were made on 3, 27 Aug and 9 Sep. All evaluations were made by selecting three plants per replication, removing all leaves, and counting the number of live larvae. A two-way ANOVA was used for analysis of Lepidoptera data using replicate totals for the entire season.