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ARS Home » Research » Publications at this Location » Publication #127976
Title: VOLUNTEER GLYPHOSATE RESISTANT CORN CONTROL IN GLYPHOSATE RESISTANT SOYBEAN. URBANA, ILLINOIS, 2001

Author
item MAXWELL, DOUGLAS - UNIV OF ILLINOIS
item HAGER, AARON - 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 treatments to control volunteer glyphosate resistant corn in glyphosate resistant soybean. The study was established near Urbana, Illinois on an Elburn silty loam with a pH of 6.6 and 4.7% organic matter. Dekalb CX303 glyphosate resistant soybean were planted 1.5 inches deep on May 10 in 30 inch rows. Dekalb 580RR (F2) corn was spread ahead of the planter. An RCB design was used with three replications of plots 7.5 feet by 30 feet. Herbicides were applied with a CO2 backpack sprayer delivering 20 gpa and equipped with 8003 flat fan nozzles. No soybean injury occurred from the preemergence treatments. Postemergence applications of 0.063 lb/A imazaquin, 0.031 lb/A imazamox, and 0.294 lb/A fomesafen showed some initial soybean injury 7 days after application but disappeared by 28 days after treatment. Initial volunteer glyphosate resistant corn control was 57-75% with 0.75 lb/A clomazone, 0.248 lb/A sulfentrazone & 0.31 lb/A cloransulam, 0.063 lb/A imazethapyr & 0.84 lb/A pendimethalin, and 0.063 lb/A imazethapyr & 0.063 lb/A imazaquin & 0.84 lb/A pendimethalin applied preemergence. All preemergence treatment activity dropped to negligible levels by 56 days after application. All graminicide containing postemergence treatments along with 0.031 lb/A imazamox and 0.063 lb/A imazaquin were the most effective for season long control. There was no volunteer glyphosate resistant corn activity with either glyphosate formulation.