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Title: UTILIZATION OF HERBICIDE RESISTANT CROPS FOR WEED MANAGEMENT IN MIDWESTERN UNITED STATES CORN AND SOYBEAN PRODUCTION

Author
item HART, STEPHEN - UNIV OF ILLINOIS
item WAX, LOYD

Submitted to: Brighton Conference Symposium Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 10/14/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Field studies were conducted to develop and evaluate weed management systems for control of Erichloa villosa in sethoxydim-resistant corn. In 1995, a single PRE application of acetochlor provided only 55% control of a heavy infestation of E. villosa at 60 DAT. Following an acetochlor treatment with a postemergence (POST) application of sethoxydim or nicosulfuron increased control to 91% or 83%, respectively. Single POST application of sethoxydim and nicosulfuron provided 90% and 60% control, respectively. Split applications of sethoxydim increased control to 99%. In 1996, the infestation was much lighter and control with acetochlor was 88%. Following acetochlor with sethoxydim or nicosulfuron provided 98% control for each treatment. Single POST treatments of sethoxydim and nicosulfuron provided 93% and 82% E. Villosa control, respectively. Split applications of sethoxydim increased control to 99%. Field studies at two locations in Illinois were designed to determine optimum use of glyphosate for weed management in glyphosate resistant soybean. Variables included rates, timings, row spacings, with evaluation of control 30 DAT. Setaria faberi and Digitaria sanguinalis control was at least 88% except when later germination occurred after POST treatments. For most species, control of weeds with glyphosate was better in 18 cm than in 76 cm spaced rows. Early POST applications of glyphosate at 0.63 kg/ha were at least as good as late POST applications. Effective control of Chenopodium album, Polygonum pensylvanicum, Amaranthus rudis, and Abutilon theophrasti was also achieved with some combination of these treatments. No single application of glyphosate in 76 cm rows provided consistent control of A. theophrasati.