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Title: RESIDUAL HERBICIDES FOR WEED CONTROL IN GLYPHOSATE RESISTANT CORN, URBANA, ILLINOIS, 1999

Author
item MAXWELL, DOUGLAS - UNIV OF ILLINOIS
item Wax, Loyd
item SPRAGUE, CHRISTY - UNIV OF ILLINOIS

Submitted to: Research Report North Central Weed Science Society United States
Publication Type: Other
Publication Acceptance Date: 12/8/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The purpose of this study was to evaluate any influence of residual herbicides to non-residual programs for weed control in corn. The study was established at the University of Illinois Crop Sciences Research and Education Center, Urbana. The soil was a Flanagan silt loam with a pH of 6.6 and 4.7% organic matter. Dekalb 589 glyphosate resistant corn was planted 1.5 inches deep on April 30 in 30 inch rows. Treatments were arranged in randomized complete blocks with six replications of plots 10 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. Corn tolerance was excellent to the soil-applied herbicide treatments. The treatment containing dicamba caused some initial injury. This injury did not persist into the growing season. Giant foxtail control was good on all plots receiving glyphosate postemergence. The lone exception was when glyphosate was applied alone at the early postemergence stage, allowing some new germinations. The residual only treatment of s- metolachlor and atrazine was weaker on giant foxtail, as well as velvetleaf and tall morningglory. Glyphosate only treatments at the postemergence and late postemergence timings were similar in weed control as sequential treatments of s-metolachlor and atrazine followed by glyphosate postemergence. Yields were all similar with a lower trend in the late postemergence glyphosate treatment and the sequential treatment of s-metolachlor and atrazine followed by primisulfuron and dicamba postemergence.