Submitted to: Research Report North Central Weed Science Society United States
Publication Type: Other
Publication Acceptance Date: 12/15/1998
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: The purpose of this study was to evaluate RPA201772 and glufosinate combinations for weed control in conventionally tilled corn. The study was established at the University of Illinois South Farm, Urbana. The soil was a Drummer silty-clay loam with a pH of 6.1 and 5.5% organic matter. Dekalb 493 glufosinate resistant corn was planted 1.5 inches deep on May 28 in 30 inch rows. Treatments were arranged in randomized complete blocks with three replications of plots 7.5 by 30 feet. Herbicides were applied with a CO2 backpack sprayer delivering 20 gpa and equipped with 8003 flat fan nozzles for preemergence applications and 8002 flat fan nozzles for postemergence applications. Plots were not cultivated after planting. Corn tolerance was excellent to the postemergence applications of glufosinate. Some injury was seen from preemergence applications of RPA201772 prior to postemergence applications of glufosinate, but did not persist throughout the growing season. Postemergence applications of glufosinate applied alone gave adequate control of all weed species at all rates tested. Weed densities were high and spray coverage was probably an issue. Applying RPA201772 preemergence followed by glufosinate gave good to excellent control in almost all rate combinations tested. In most cases the combination equaled or exceeded the control ratings for the two standard postemergence treatments of glufosinate plus atrazine or the sequential application of glufosinate.