Agriculture, Pêche et Aquaculture
Department of Agriculture, Aquaculture and Fisheries
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  Evaluation of Fungicides for Control of Leaf and Fruit Diseases in the Crop Year of Lowbush Blueberry

K. Lynch and M. Melanson

Abstract: The fungicides; boscalid, boscalid + pyraclostrobin and phosphorus acid were applied to a cropping field on June 17 (late bloom) in a randomized block split plot design with 4 replications. Powdery mildew, Septoria leaf spot and leaf drop were assessed on August 13 using a 1 to 5 severity rating scale. All treatments significantly reduced powdery mildew and leaf drop however only the Lance and Pristine treatments gave a high level of disease suppression. The results for Septoria leaf spot were similar with the same two treatments giving good disease control. Although Confine treatments were significantly different from the untreated control, the disease suppression differences were small and yields were not significantly increased compared to the untreated control. Lance applied alone increased yields by 31 percent compared to the untreated check (NS, P=0.05) and the Pristine treatment increased yields by 83 percent (S, P=0.05). On August 12, Lance and Confine were applied as split plot treatments to evaluate post harvest disease suppression. After 14 days no disease was present in any of t he treatments stored at 4 degrees and only trace amounts of disease were present in fruit stored at 22 degrees with no significant differences between treatments.

Agriculture, Aquaculture and Fisheries
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