Post-Flood Tank-Mix Combinations with Cyhalofop (Clincher) for Barnyardgrass (Echinochloa crus-galli) Control in Rice

Post-flood applications of Clincher controlled tillered barnyardgrass from 65 to 85% when evaluated from 2 to 4 weeks after treatment. Grandstand, 2,4-D amine, and Blazer all caused reduction in control of barnyardgrass when tank-mixed with cyhalofop early after application. Clincher applied alone at 0.28 lb/acre controlled barnyardgrass 96% 8 weeks after treatment. Barnyardgrass control with Clincher was reduced significantly when tank-mixed with either 2,4-D amine or Blazer, when evaluated 8 weeks after treatment. Facet, propanil, Londax, and Aim did not cause significant reductions in barnyardgrass control at any time evaluated following application. Due to the extremely long period of weed competition prior to the herbicide treatments being applied post flood, rice yields were less than 100 bu/acre for all treatments. However, salvage applications of those treatments where antagonism did not occur did result in a 37 bu/ acre yield increase. Even though significant antagonism occurred when 2,4-D was tank-mixed with Clincher, yields increased from 53 to 73 bu/acre for that treatment. Clincher at 0.28 lb/acre provided equivalent control of barnyardgrass post-flood to the industry standard of 0.38 lb/acre of Facet plus 4.0 lb/acre propanil.