|Maxwell, Douglas - UNIVERSITY OF ILLINOIS|
Submitted to: Research Report North Central Weed Science Society United States
Publication Type: Other
Publication Acceptance Date: December 18, 1997
Publication Date: N/A
Technical Abstract: The purpose of this study was to evaluate various herbicide programs for weed control in corn. The study was established at the University of Illinois South Farm, Urbana. The soil was a Flanagan silt loam with a pH of 6.4 and 4.8% organic matter. Dekalb 592SR corn was planted 1.5 inches deep on April 15 in 30 inch rows. Treatments were arranged in randomized complete blocks with three replications of plots 7.5 by 36 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. Corn tolerance was excellent to the soil-applied herbicide treatments. Many of the postemergence treatments containing dicamba caused initial injury. This injury did not persist into the growing season. Only 0.5 inches of rain were received within two weeks following preemergence applications lowering herbicide activation. Weakness on common lambsquarters, velvetleaf, and common ragweed were noted for some of the soil-applied treatments. A notable exception was the broad spectrum weed control observed with the combination of acetochlor, RPA201772, and atrazine. The majority of postemergence herbicide treatments provided excellent broad spectrum weed control. The total postemergence treatments of rimsulfuron, nicosulfuron, atrazine, and dicamba provided excellent broad spectrum weed control.