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ARS Home » Research » Publications at this Location » Publication #127974
Title: WEED CONTROL SYSTEMS IN GLYPHOSATE RESISTANT SOYBEAN, URBANA, ILLINOIS, 2001

Author
item MAXWELL, DOUGLAS - UNIV OF ILLINOIS
item SIMMONS, F - UNIV OF ILLINOIS
item WAX, LOYD

Submitted to: Research Report North Central Weed Science Society United States
Publication Type: Other
Publication Acceptance Date: 12/12/2001
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The objective of this research was to evaluate various herbicide systems for weed control in glyphosate resistant soybean. 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 6.3 and 4.7% organic matter. Dekalb CX303 glyphosate resistant soybean were planted 1.5 inches deep on May 9 in 30 inch rows. Treatments were arranged in randomized complete blocks with three replications of plots 7.5 feet by 36 feet. Herbicides were applied with a CO2 backpack sprayer delivering 20 gpa and equipped with 8003 flat fan nozzles. AMS = N-Pak 21% active, at % volume/volume. Some initial soybean injury occurred with flumioxazin and pendimethalin 40 days after the preemergence treatment. Moderate soybean injury was observed from the total postemergence treatments containing the imazethapyr & glyphosate premixture at 10 and 30 days after application. Most preemergence treatments performed very good to excellent at 40 days after application, except 0.032 lb/A cloransulam, 0.25 lb/A sulfentrazone, 0.073 sulfentrazone & 0.015 lb/A chlorimuron, 0.124 lb/A sulfentrazone & 0.016 lb/A cloransulam, and 0.05 flumetsulam. Sequential postemergence applications provided excellent weed control regardless of the preemergence or postemergence component. The total postemergence treatments containing the imazethapyr & glyphosate premixture showed some variability in Pennsylvania smartweed and common lambsquarters control.