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Effects of fall bearing-year glufosinate applications, spring nonbearing-year glufosinate applications, and spring nonbearing-year foramsulfuron applications on hair fescue (Festuca filiformis) in lowbush blueberry

Published online by Cambridge University Press:  04 November 2020

Scott N. White Open the ORCID record for Scott N. White [Opens in a new window]  and
Linshan Zhang
Scott N. White*
Affiliation:
Assistant Professor, Department of Plant, Food, and Environmental Sciences, Dalhousie University Faculty of Agriculture, Truro, NS, Canada
Linshan Zhang
Affiliation:
Graduate student, Department of Plant, Food, and Environmental Sciences, Dalhousie University Faculty of Agriculture, Truro, NS, Canada.
*
Author for correspondence: Scott White. 50 Pictou Road, Truro, Nova Scotia B2N 2R8, Canada. Email: scott.white@dal.ca
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Abstract

Hair fescue is a common perennial grass that reduces yields in lowbush blueberry fields. This grass is suppressed with nonbearing-year foramsulfuron applications, though suppression may be improved through use of sequential glufosinate and foramsulfuron applications. The objective of this research was to determine the main and interactive effects of fall bearing-year glufosinate applications, spring nonbearing-year glufosinate applications, and spring nonbearing-year foramsulfuron applications on hair fescue. The experiment was a 2 by 2 by 2 factorial arrangement of fall bearing-year glufosinate application (0, 750 g ai ha–1), spring nonbearing-year glufosinate application (0, 750 g ai ha–1), and spring nonbearing-year foramsulfuron application (0, 35 g ai ha–1) arranged in a randomized complete block design at lowbush blueberry fields located in Parrsboro and Portapique, NS, Canada. Fall bearing-year glufosinate applications, spring nonbearing-year glufosinate applications, and spring nonbearing-year foramsulfuron applications alone provided inconsistent hair fescue suppression. Fall bearing-year glufosinate applications followed by spring nonbearing-year foramsulfuron applications, however, reduced nonbearing-year total tuft density, flowering-tuft density, and flowering-tuft inflorescence number at each site and reduced seed production at Portapique. Sequential fall bearing-year and spring nonbearing-year glufosinate applications or sequential spring nonbearing-year glufosinate and foramsulfuron applications reduced flowering-tuft density and flowering-tuft inflorescence number at each site but did not consistently reduce total tuft density. Sequential herbicide treatments reduced bearing-year seedling density and may therefore contribute to hair fescue seed bank management in lowbush blueberry.

Keywords

Fall herbicidespring herbicideperennial grass managementForamsulfuronglufosinatehair fescueFestuca filiformis PourrFESTElowbush blueberryVaccinium angustifolium Ait.
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 2 , April 2021 , pp. 330 - 337
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Steve Fennimore, University of California, Davis

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