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Hexazinone Resistance in Red Sorrel (Rumex acetosella)

Published online by Cambridge University Press:  20 January 2017

Zhenyi Li ,
Nathan Boyd ,
Nancy McLean  and
Katherine Rutherford
Zhenyi Li
Affiliation:
Department of Environmental Sciences, Dalhousie University Agricultural Campus
Nathan Boyd*
Affiliation:
Gulf Coast Research and Education Center, University of Florida
Nancy McLean
Affiliation:
Department of Animal and Plant Science, Dalhousie University Agricultural Campus, Truro, B2N 5E3, NS, Canada
Katherine Rutherford
Affiliation:
Department of Animal and Plant Science, Dalhousie University Agricultural Campus, Truro, B2N 5E3, NS, Canada
*
Corresponding author's E-mail: nsboyd@ufl.edu
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Abstract

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.

Keywords

Hexazinone, Velparred sorrel, Rumex acetosella L.lowbush blueberry, Vaccinium angustifolium Ait.Hexazinone-resistantmutationpsbA
Type
Weed Management
Information
Weed Science , Volume 62 , Issue 3 , September 2014 , pp. 532 - 537
Copyright
Copyright © Weed Science Society of America 

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