Agriculture, Pêche et Aquaculture
Department of Agriculture, Aquaculture and Fisheries
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  Evaluation of Glyphosate Timing and Tank Mixes for Weed Control in Roundup–ready Field Corn

G.L. Graham and W. Brown

Abstract: Growers have adopted Roundup–ready cultivars due to ease of weed control and adequate hybrid choice. for optimum weed control and yield protection, glyphosate should be applied early in the season, typically at the 3–5 leaf stage of corn. Growers are concerned with late season weed escapes and an application of glyphosate at the 3-leaf stage may not control late season weeds. A trial was initiated in a commercial corn field near Keswick Ridge, New Brunswick to evaluate the use of glyphosate with soil–residual tank mix herbicides. No significant crop injury was noted and overall weed pressure was low in the trial area. Most tank mixes with glyphosate had significantly improved weed control within the first two rating periods, whereby a second flush of weeds was controlled by the residual nature of the tank mix treatments. This improvement dissipated by the final rating period, except for the glyphosate/s–metolachlor/atrazine treatment. The conventional standard, foramsulfuron + dicamba/atrazine, had similar weed control to the glyphosate treatments. The additional cost of a tank mix partner, in relation to a second glyphosate application, as in the split application, should be evaluated by producers.

Agriculture, Aquaculture and Fisheries
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