Agriculture, Pêche et Aquaculture
Department of Agriculture, Aquaculture and Fisheries
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  Evaluation of Spring Applied, Sprout–year Herbicides for Sheep Sorrel Control in Wild Blueberries

G.L. Graham and M.J. Melanson

Partner: Bleuets NB Blueberries

Abstract: Sheep sorrel (Rumex acetosella) is an annual or short–lived perennial weed. Recently, blueberry growers are reporting heavier than normal sheep sorrel populations and the weed has moved beyond its typical bare spot habitat and is being found more often within clones of blueberries. Herbicide options, such as mesotrione and hexazinone, can be quite variable in their control levels. A trial was established in the spring in a commercial blueberry field near Aulac, New Brunswick to evaluate pre–emergent and post–emergent sprout year herbicides options for sheep sorrel control. Aminopyralid, sulfentrazone post–emergence at the high rate and nicosulfuron/rimsulfuron caused significant crop injury in early season evaluations. The crop recovered and no significant yield effect was noted, although yield from aminopyralid was the lowest recorded. Sheep sorrel populations were extremely high in this trial, contributing to increased variability in the control ratings found. Sheep sorrel regrowth occurred in all treatments in the crop year, where hexazinone, hexazinone/mesotrione tank mix, hexazinone/mesotrione split application, high rate of sulfentrazone post–emergence and nicosulfuron/rimsulfuron all consistently suppressed sheep sorrel populations. As no single treatment evaluated controlled sheep sorrel populations into the crop year, additional evaluations should occur, with a focus on repeated herbicide applications.

Agriculture, Aquaculture and Fisheries
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