Velvetbean Caterpillar Control in Soybean, 1987

Abstract

The experiment was located in Gadsden County, Fla., and planted 12 Jun. Plot size was 6 rows × 15 m with a 76-cm row spacing. Experimental design was a randomized complete block, with 4 replications. All treatments were applied 4 Sep, except for a treatment of the velvetbean caterpillar (VBC) plaque-purified nuclear polyhedrosis virus (AgNPV), which was applied 28 Aug. All treatments were made with a 2-row, CO2-powered backpack sprayer equipped with three D3 nozzles/row. The chemicals were applied at 36 psi, with a spray volume of 25 gal/acre. Efficacy data were made by taking 25 sweeps/plot with a 38-cm-diam sweep net on each of 5 dates.. The 2 center rows of each plot were not sampled, and yield estimates were made by harvesting 12 m of these rows on 2 Oct.