Agriculture, Pêche et Aquaculture
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  Evaluation of Fall Herbicide Application Followed by Hexazinone Application in the Spring for Lambkill and Rhodora Control in Wild Blueberries

G.L. Graham, G. Chiasson and É. Thériault

Partner: Bleuets NB Blueberries

Abstract: Lambkill (Kalmia angustifolia) and rhodora (Rhododendron canadense) are weeds that are potentially difficult to control in wild blueberry fields. They are generally present at high densities before establishment of the field and can interfere with production during subsequent cropping years if they escape hexazinone treatment. The addition of a hexazinone treatment in the spring following a fall herbicide application could contribute to improved weed control. A trial was established in a commercial wild blueberry field in the Lavillette region of New Brunswick in the fall after blueberry harvest. The trial design was a split plot with the main plots represented by the herbicide applied in the fall and the sub–plots the spring herbicide treatment. A spring hexazinone application, at the lowest registered rate, had no effect on crop injury or weed control, so this repeated application would be possible but may not be economical for producers. The low application rate of hexazinone may not have been high enough to have an effect on the species evaluated. There was early crop injury from all Group 4 products, with recovery over later ratings and no significant yield effect. All fall herbicides evaluated offered adequate lambkill control in the sprout year, with the highest control level in the glyphosate treatments. Lambkill re–growth was noted for glyphosate treatments. Control from the glyphosate–IPA salt had decreased as compared to the glyphosate–K formulation in the crop year. Rhodora control was more problematic, with only dicamba plus 2,4–D ester offering suppression of the weed on the final rating date. Additional fall evaluations are required, including the effect of mowing date and additional herbicide applications for control of both lambkill and rhodora.

Agriculture, Aquaculture and Fisheries
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