CONTROL OF RICE WATER WEEVIL WITH GF-317, WARRIOR, KARATE Z AND DIMILIN 2L, 2003

The experiment was conducted in 2003 at the Texas A&M University Agricultural Research and Extension Center at Beaumont. The experiment was designed as a RCB with seven treatments (see list of treatments in tables) and four replications. Plot size was 18 ft x 4 ft (seven rows, 7 inches between rows) and each plot was surrounded by a metal barrier to prevent interplot movement of pesticides and fertilizer. On 9 May, plots were drill-planted with Cocodrie at 90 lb/acre, handfertilized with urea at 113.3 lb N/acre and flushed (48 h flood followed by drain). From emergence of rice to application of the permanent flood plots were flushed as needed. On 17 May, rice emerged through League soil. On 22 May, plots were sprayed with Arrosolo 3-3E at 2 qt/acre, Basagran at 1.5 pt/acre, Facet 75DF at 0.5 lb/acre, and Latron CS-7 at 1 pt/acre. This tank mix of herbicides was applied with a two person, CO2-powered (20-30 psi) spray rig equipped with 13 nozzles (80015 tip size, 50 mesh screens). Spray swath width was 21.7 ft and final spray volume was 12.3 gpa. On 6 Jun (20 d after rice emergence), selected treatments were applied with a hand-held, CO2-powered (20-30 psi) spray rig equipped with three nozzles (tip size 800067, 50 mesh screens). Spray swath width was 4 ft and final spray volume was 28.8 gpa. Immediately following these treatment applications, plots were hand-fertilized with urea at 56.7 lb N/acre and permanently flooded (20 d after rice emergence). Three days after application of the permanent flood, selected treatments were applied using the same materials and methods as described previously. On 20 Jun, plots were handfertilized with urea at 56.7 lb N/acre. On 27 Jun and 11 Jul (21 and 35 d, respectively, after application of the permanent flood), five, 4 inch diam. by 4 inch deep (each core contained at least one rice plant) mud cores were removed from each plot. Cores were washed into a 40 mesh screen bucket and RWW larvae and pupae recovered and counted. On 8 Jul, plots were hand-fertilized with urea at 30 lb N/acre; thus, plots received a total of 25.6 7 lb N/acre for the entire growing season. On 18 Sep (124 d after rice emergence, plots were harvested with a small plot combine. Yields were adjusted to 12% moisture. RWW counts were transformed using x + 0.5 and all data analyzed by ANOVA and means separated by LSD.