Cranberry Tolerance to Clopyralid

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  • 1 Washington State University, Long Beach Research and Extension Unit, Box 570, Long Beach, WA 98631
  • | 2 Plant Science Department, Cook College, Rutgers State University of New Jersey, P.O. Box 231, New Brunswick, NJ 08903-0231
  • | 3 Ocean Spray Cranberries, 1 Ocean Spray Drive, Lakeville-Middleboro, MA 02349
  • | 4 Department of Horticulture, University of Wisconsin, Madison, WI 53706

Tolerance of cranberry (Vaccinium macrocarpon Ait.) at different phenological stages to the postemergent broadleaf herbicide clopyralid (0.21 or 0.42 kg a.i./ha) was evaluated in Washington, New Jersey, Massachusetts, and Wisconsin. Tolerance varied among states, rates, and application times. Applications made during early shoot growth, especially at the high rate, usually resulted in the most crop injury (leaf cupping and epinasty and reduced yield); while applications at the low rate made after vegetative development occurred usually resulted in less or no injury. No phytotoxicity occurred when applications were made before shoot growth (Washington and New Jersey). Chemical name used: 3,6-dichloro-2-pyridinecarboxylic acid (clopyralid).

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