Control of Rice Water Weevil with Dimilin, 1996A

Abstract

Abstract The experimental design was a RCB with 4 replications. Plot size was 9 rows (7 inch spacing) by 20 ft. Each plot was bound by levees. Rice was drill-seeded in Crowley silt loam at 90 lb/acre on 3 May and emerged on 12 May. Propanil and Bolero at 4 and 2 lb (AI)/acre, respectively, were applied for weed control on 29 May. Nitrogen was applied in a 3-way split of 75 lb N/acre as urea on 12 Jun and 30 lb N/acre on 5 and 14 Jul. Permanent flood was established on 12 Jun. All treatments of Dimilin were made with a CO2-pressurized back-pack sprayer at 18 gpa. Furadan 3G was applied 10 d after permanent flood with a hand-shaker. On 3 and 5 Jul and on 9 and 10 Jul five 4X4 inch (diam by depth) soil cores with an average of 5 plants/core were removed from plots. Soil was washed from the plant roots into a 40-mesh screen. The screen was immersed in salt water and RWW immatures were removed. Plots were harvested with a small combine on 13 Sept. Reported yields were adjusted to 12% moisture. Data were analyzed with ANOVA and LSD.