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  Weed Management in Cranberry - 2001

Kevin Patterson1

Partner: The New Brunswick Cranberry Growers Association and the Nova Scotia Cranberry Growers Assocation

Abstract: Two seasons of greenhouse and field trials to evaluate weed control products for use as post-emergent foliar applications in cranberries have been completed. Trials were conducted at five sites, two in New Brunswick and three in Nova Scotia. Visual ratings on crop tolerance and weed control were taken at intervals throughout the summer. Yield data were collected from three sites which was producing uniformly. In 2000, products which exhibited favourable tolerance for crop tolerance, weed control and yield include: chlorimuron-ethyl, nicosulfuron/rimsulfuron, terbacil and triasulfuron. Some crop injury was caused by triasulfuron initially but the cranberry crop recovered from the symptoms. Products which exhibited fair tolerance include: nicosulfuron, propyzamide, prosulfuron and rimsulfuron. Products which exhibited poor tolerance include: imazathapyr, flumetsulam/clopyralid, napropamide, thifensulfuron-methyl/tribenuron-methyl and tribenuron-methyl. Imazathapyr caused unacceptable crop injury from which the plants did not recover. In 2001, imazathapyr, flumetsulam/clopyralid and napropamide were dropped as post-emergent treatments and quinclorac added. Two products, napropamide and dichlobenil, currently registered for cranberries as early spring prebloom applications were also added as standard treatments. Products which performed favourably for a second season included: chlorimuron-ethyl, triasulfuron and nicosulfuron/rimsulfuron. Also performing well were: rimsulfuron, nicosulfuron, propyzamide and quinclorac. Tolerance improved over the 2000 season while quinclorac was evaluated in 2001 only. Results for terbacil in 2001 were not as favourable as those of 2000 and crop yields were significantly lower in 2001. Products which produced unacceptable results in 2001 were: prosulfuron, tribenuron-methyl and thifensulfuron-methyl/tribenuron-methyl.

1Departmental of Environmental Sciences, NSAC, Truro, NS, B2N 5E3

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