Control of Rice Water Weevil with Karate and ICIA0321 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 10 treatments and 4 replications. Each plot was 15 ft X 8 ft and surrounded by a metal barrier to prevent movement of fertilizer and insecticides. On 23 Apr, plots were fertilized with urea at 57 lb nitrogen/acre and hand planted with 100 lb seed/acre. Fertilizer and seed were incorporated into dry League soil with a rake. Immediately after incorporation, plots were flush irrigated (24-48 h temporary flood then drain). Rice emerged through soil on 4 May. From emergence of rice through soil to application of the permanent flood on 25 May (21 d after emergence of rich through soil), plots were flush irrigated as needed. On 19 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 rig pressurized with CO2. On the same day (6 d before application of the permanent flood), selected plots were sprayed with Karate at 0.03 lb (AI)/acre. On 22 May (3 d before application of the permanent flood), selected plots were sprayed with Karate at 0.03 lb (Al)/acre. On 23 May, plots were fertilized with urea at 57 lb nitrogen/acre. On 28 May (3 d after application of the permanent flood), selected plots were sprayed with Karate, ICIA0321 1 CS, and ICIA0321 2.09 CS at the rates shown in the table. Before postflood applications, RWW adults were active in the plots. All insecticide sprays were applied with a 4 nozzle (tip size 800067, 50 mesh screens), hand-held spray rig pressurized with CO2. Final spray volume was 16.0 gpa. On 9 Jun, Furadan 3 G was applied with a hand-held shaker jar at 20 lb/acre. On 16 Jun and 10 Jul, plots were fertilized with urea at 50 and 30 lb nitrogen/acre, respectively; thus, total nitrogen applied during the growing season was 194 lb/acre. On each of 21 Jun and 9 Jul (27 and 45 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 (18 Aug = 106 d after 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 Jata analyzed by 2-way ANOVA and DMRT.