Agriculture, Pêche et Aquaculture
Department of Agriculture, Aquaculture and Fisheries
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  Evaluation of Graminicides Applied in the Spring of the Crop Year in Wild Blueberries

G.L. Graham1 and M.J. Melanson1

Parter: Bleuets NB Blueberries

Abstract: Grass weeds continue to be problematic in New Brunswick blueberry production. Ticklegrass (Agrostis scabra) can interfere with mechanical crop harvest. Only fluazifop-p-butyl is registered for post-emergent grass control in the crop year. This product has a 60 day pre-harvest interval, which can be problematic for use in blueberry. A trial was established in the crop year of a wild blueberry field near Tower Hill, New Brunswick to evaluate ticklegrass control options. Ticklegrass control from early applications of both fluazifop and sethoxydim was excellent for both rates tested, while control was reduced for late season applications. Mesotrione alone suppressed weed growth and control was improved in tank mixes with the above graminicides. Mesotrione also gave early season control of narrow-leaf goldenrod (Euthamia graminifolia) but weed re-growth occurred by the end of the season. No significant crop injury or yield reduction was noted for any treatment as compared to the control, although the entire trial area had lower yields as compared to industry averages as ticklegrass is closely associated with areas of decreased blueberry coverage.

1NB Department of Agriculture and Aquaculture, Crop Development Branch, P. O. Box 6000, Fredericton, NB E3B 5H1

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