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Selective Nimblewill (Muhlenbergia schreberi) Control in Cool-Season Turfgrass

Published online by Cambridge University Press:  20 January 2017

John B. Willis ,
Josh B. Beam ,
Whitnee L. Barker ,
Shawn D. Askew  and
J. Scott McElroy
John B. Willis
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Blacksburg, VA 24060
Josh B. Beam
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Blacksburg, VA 24060
Whitnee L. Barker
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Blacksburg, VA 24060
Shawn D. Askew*
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Blacksburg, VA 24060
J. Scott McElroy
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996
*
Corresponding author's E-mail: saskew@vt.edu
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Abstract

Isoxaflutole and mesotrione have been used to control creeping bentgrass in cool season turf, these experiments evaluate these two products for selective nimblewill control. Three experiments were conducted in Virginia and Tennessee to evaluate selective control options for nimblewill in cool-season turfgrass. Single applications of isoxaflutole control nimblewill more effectively than single applications of mesotrione. Nimblewill control 8 wk after initial treatment (WAIT) increased as mesotrione rates increased from 28 to 280 g ai/ha, and isoxaflutole rates increased from 28 to 168 g/ha. Isoxaflutole at 84 and 168 g/ha were the only single application treatments that controlled nimblewill greater than 80% 8 WAIT. However, sequential applications of isoxaflutole and mesotrione at 28 g/ha, 10 d apart controlled nimblewill 94 and 80%, respectively 8 WAIT. Triclopyr and fenoxaprop-p did not effectively control nimblewill and caused unacceptable turfgrass injury. Long-term control was not evaluated in these studies. However, it was concluded that isoxaflutole and mesotrione at appropriate rates and applied in sequence selectively control nimblewill without harming desirable turf.

Keywords

Isoxaflutolemesotrionenimblewill, Muhlenbergia schreberi J. F. Gmel. MUHSCTurfgrass injuryperennial grass suppression
Type
Research
Information
Weed Technology , Volume 21 , Issue 4 , December 2007 , pp. 886 - 889
Copyright
Copyright © Weed Science Society of America 

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