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  Evaluation of Flumioxazin for Hair-Cap Moss Control in the Sprout Year of Wild Blueberry

G.L. Graham and M.J. Melanson

Partner: Bleuets NB Blueberries

Abstract: Mosses, in particular hair-cap moss (Polytrichum commune), are difficult to manage within wild blueberry production. The change in management practices towards less burning as a pruning method has increased moss prevalence, as regular burning can decrease moss populations. In the spring of 2009, a trial was established near Pennfield, New Brunswick in a commercial wild blueberry field entering the vegetative phase of production. The highest rate of flumioxazin suppressed blueberry growth, but not at a commercially significant level. Flumioxazin at 214 g ai/ha or 143 g ai/ha plus NIS also caused slight injury, although plants recovered by the end of the sprout year with no significant injury in the crop year. Hexazinone had no effect on hair-cap moss. A rate effect was present for flumioxazin over all rating dates, with improved control at higher use rates. For season-long control, either a rate of 428 g ai/ha flumioxazin or 143 g ai/ha plus NIS would be required. The lower use rate with NIS has a lower application cost and potentially could improve crop safety. Control levels declined early in the crop year, indicating that multiple applications or different application timings may be required for moss control.

Agriculture, Aquaculture and Fisheries
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