Control of Rice Water Weevil with Exp 80698A 75 Fs Applied Before the Permanent Flood in a Dry-Seeded, Delayed Flood Culture, 1997

Abstract

Abstract The experiment was conducted at the TAMU Agricultural Research and Extension Center at Beaumont and was designed as a RCB with 6 treatments and 4 replications. Each plot was 15 ft X 8 ft and surrounded by a metal barrier to prevent movement of insecticide. On 4 May, plots were fertilized with urea at 113 lb nitrogen/acre and hand planted with untreated or treated seed at 100 lb seed/acre. EXP 80698A 75 FS was applied to seed at the rates in the table. Rhone-Poulenc Ag Company provided the treated seed. Also on 4 May, selected plots were tested with EXP 80698A 75 FS at the rates in the table using a 4 nozzle (tip size 800067, 50 mesh screens), hand-held spray rig pressurized with CO2. Final spray volume was 16.0 gpa. Immediately after planting and applying fertilizer and insecticide, dry League soil in plots was raked to incorporate urea, seed and insecticide. Immediately after incorporation, plots were flushed (24-48 h temporary flooding, then draining). Rice emerged through soil on 14 May. From emergence of rice through soil to application of the permanent flood on 4 Jun (21 d after rice emergence through soil), rice was flush irrigated as needed. On 28 May, plots were sprayed with Facet 75 DF at 0.5 lb/acre, crop oil concentrate at 2 pt/acre, Prowl 3.3 EC at 2 pt/acre, and Basagran at 1.5 pt/acre. Herbicides were applied by hand with a 20 ft spray boom pressurized with CO2. On 18 Jun (14 d after application of the permanent flood), selected plots were treated with Furadan 3 G at 20 lb/acre using a hand-held shaker jar. On 19 Jun and 10 Jul, plots were fertilized with urea at 30 lb nitrogen/acre; thus, total nitrogen applied during the growing season was 173 lb/acre. On each of 29 Jun and 11 Jul (25 and 37 d, respectively, after application of the permanent flood), five 4-inch diam X 4 inch deep soil cores (each containing at least 1 rice plant) were removed from each plot. Rice plants in cores were washed and immature RWW recovered from the roots. At maturity, plots were harvested (6 Sep = 115 d from emergence of rice through soil) with a small plot combine. Yields were adjusted to 12% moisture. Insect counts were transformed using x + 0.5 and all data analyzed by 2-way ANOVA and DMRT.