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1 July 2014 Hexazinone Resistance in Red Sorrel (Rumex acetosella)
Zhenyi Li, Nathan Boyd, Nancy McLean, Katherine Rutherford
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Biannual applications of hexazinone have been applied in many lowbush blueberry fields in Nova Scotia for more than 30 years. Persistent reliance on a single herbicide chemistry may have selected for hexazinone-resistant red sorrel. The recommended rate of hexazinone (1.92 kg ai ha−1) no longer controls red sorrel in many growing regions. Six levels of hexazinone (0, 0.48, 0.96, 1.92, 3.84, and 7.68 kg ai ha−1) were applied to red sorrel plants grown in a greenhouse from seeds collected from three commercial fields and a no blueberry area to determine if they were hexazinone resistant. Red sorrel from two sites where hexazinone had not been applied regularly died at the 0.96 kg ai ha−1 rate of hexazinone whereas red sorrel from two commercial fields survived at 7.68 kg ai ha−1. It is concluded that red sorrel is hexazinone-resistant in some wild blueberry fields. A portion of the psbA gene was sequenced and it was determined that resistant plants had a Phe to Val substitution at position 255 in the D1 protein. This is the first recorded instance of hexazinone resistance in a perennial broadleaf weed in blueberry fields.

Nomenclature: Hexazinone, Velpar; red sorrel, Rumex acetosella L.; lowbush blueberry, Vaccinium angustifolium Ait.

Weed Science Society of America
Zhenyi Li, Nathan Boyd, Nancy McLean, and Katherine Rutherford "Hexazinone Resistance in Red Sorrel (Rumex acetosella)," Weed Science 62(3), 532-537, (1 July 2014).
Received: 24 November 2013; Accepted: 1 March 2014; Published: 1 July 2014

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