Control of RWW with Carbofuran, 1991

Abstract

Abstract The study consisted of 2 experiments conducted at the TAMU Agricultural Research and Extension Center at Beaumont. Experiment 1 was designed as a randomized complete block with 5 treatments and 4 replications. Plot size was 16 ft × 12 rows 7 inches apart. Rice was drill planted at 100 lbs seed/acre on 4 Apr and flushed with rain on the same date. Thiobencarb was applied preemergence on 9 Apr at 4.0 lbs (AI)/acre. Rice emerged 9 d after planting. Urea was applied at the seedling stage of growth on 26 Apr at 68 lbs N/acre. Propanil and bentazon were applied at 3 and 0.75 lbs (AI)/acre, respectively, on 6 May, 7 d before the permanent flood which was applied 30 d after rice emergence. Urea was applied a second time at 51 lbs N/acre immediately before the permanent flood. From rice emergence to the permanent flood, rice was flushed as needed. Flowable Furadan was applied to rice using a 4 nozzle spray rig with 800067 tips and 100 mesh screens. Spray vol was 20.5 gal/acre. Flowable Furadan was also applied to urea by slowly and gradually pipetting the liquid onto the fertilizer in a glass jar which was shaken continuously for 5 min. The carbofurancoated urea was air dried and clumps were.manually broken up and applied by hand. Granular carbofuran was applied with a hand-held shaker. Plots sprayed with flowable Furadan and treated with carbofuran-coated urea were surrounded by metal barriers to prevent movement of insecticide. Bensulfuron was applied at 1 oz (AI)/acre on 17 May, 4 d after the permanent flood. Urea was applied a third and fourth time at 51 lbs N/acre on 28 May and 12 Jun. Five, 4-inch diameter by 4-inch deep soil cores containing approximately 1 plant were removed from each plot on 4 Jun, 22 d after the permanent flood. Plants in cores were washed and roots inspected for RWW immatures. The middle 8 rows of each plot were harvested at maturity with a combine. Grain was cleaned, weighed, and yield adjusted to 12% moisture. Experiment 2 was designed the same as Experiment 1. Urea was applied preplant on 12 Jul at 68 lb N/acre followed by drill planting at 100 lb seed/acre on the same date. Plots were flushed 13 Jul and thiobencarb applied preemergence 18 Jul at 4 lbs AI/ acre. Rice emerged 8 d after planting. Propanil and bentazon were applied at 3 and 0.75 lbs Al/acre, respectively, on 31 Jul 7 d before the permanent flood which was applied 18 d after rice emergence. Urea was applied a second time at 51 lbs N/acre on 7 Aug immediately before the permanent flood. Flowable Furadan was applied to urea and granular carbofuran was applied to plots as described in Experiment 1. Evaluation of treatment efficacy and harvest methods were the same as in Experiment 1. Efficacy data from both experiments were transformed using Vx + 0.5. All data were analyzed by ANOVA and, where appropriate, means separated by DMRT.