American Journal of Plant Sciences (2017) 8, 3414-3428

Matthew G. Underwood, Nader Soltan, David C. Hooker, Darren E. Robinson, Joseph P. Vink, Clarence J. Swanton and Peter H. Sikkema (2017)
Weed control, environmental impact, and net-profit of two-pass weed management strategies in dicamba-resistant soybean (Glycine max) using conventional tillage
American Journal of Plant Sciences 8 (13), 3414-3428
Abstract: Traditional two-pass weed management strategies need to be compared with new strategies in glyphosate/dicamba-resistant soybean. Weed control, soybean yield, partial profitability and environmental impact (EI) were evaluated in glyphosate/dicamba-resistant soybean using dicamba applied alone or in a tank-mix with dimethenamid-P applied preemergence (PRE). Trials were conducted at three locations during 2014 and 2015. Several PRE herbicides provided excellent control of broadleaf and grass weeds. Dicamba provided > 91% control of broadleaf weeds, and the addition of dimethenamid-P improved grass control. All weed species at the trial locations were controlled > 94% following a postemergence (POST) application of glyphosate. Weed interference reduced soybean seed yield 33% where no herbicide was applied. A single POST application of glyphosate had the lowest EI. Several treatments improved early-season weed control and reduced early-season weed density and biomass compared to glyphosate and had similar EI values. In this study, there was no benefit to yield or partial profit by including a PRE herbicide for weed management; however, the inclusion of multiple modes-of-action in a herbicide program may reduce the selection for herbicide-resistant weeds.
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Database assignments for author(s): Clarence J. Swanton

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Amaranthus retroflexus (weed)	Soybean (Glycine max)	Canada (east)
	Chenopodium album (weed)	Soybean (Glycine max)	Canada (east)
	Setaria viridis (weed)	Soybean (Glycine max)	Canada (east)
	Ambrosia artemisiifolia (weed)	Soybean (Glycine max)	Canada (east)