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 glyphosate and glufosinate weed control options in resistant conventional tillage 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 580 glyphosate resistant and Dekalb 493 glufosinate resistant corn were planted 1.5 inches deep on May 15 in 30 inch rows. Treatments were arranged in randomized complete blocks with three replications of plots 7.5 by 33 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 all of treatments. Glyphosate and glufosinate treatments looked good at early ratings. Total postemergence treatments with acetochlor did not perform as well as total postemergence treatments containing atrazine or MON12000. Sequential treatments performed as well as any treatments. Preemergence only treatments suffered some with 14 plus inches of rainfall from planting thru June. Yields generally tracked with weed control.