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Interference and Control of ALS-Resistant Mouse-Ear Cress (Arabidopsis thaliana) in Winter Wheat

Published online by Cambridge University Press:  21 December 2018

Ranjeet S. Randhawa ,
James H. Westwood ,
Charles W. Cahoon  and
Michael L. Flessner Open the ORCID record for Michael L. Flessner [Opens in a new window]
Ranjeet S. Randhawa
Affiliation:
Graduate Research Assistant; Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, VA, USA
James H. Westwood
Affiliation:
Professor; Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, VA, USA
Charles W. Cahoon
Affiliation:
Assistant Professor; Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, VA, USA
Michael L. Flessner*
Affiliation:
Assistant Professor, Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, VA, USA
*
*Author for correspondence: Michael L. Flessner, Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, VA 24061. (Email: flessner@vt.edu)
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Abstract

In 2015, winter wheat growers in Virginia reported commercial failures of thifensulfuron to control mouse-ear cress. This was the first reported case of field-evolved acetolactate synthase (ALS) resistance in mouse-ear cress, so research was conducted to evaluate alternative herbicide options as well as to document potential yield loss in winter wheat from mouse-ear cress. Efficacy studies were conducted at three site-years in 2015 to 2016 and 2016 to 2017 as well as a POST greenhouse trial. In the PRE study, flumioxazin, pyroxasulfone, saflufenacil, and metribuzin resulted in more than 80% mouse-ear cress control 15 wk after planting across all sites with no observable wheat injury. No differences were observed in wheat yield in two of three sites in the PRE herbicide study; yield differences were attributed to common chickweed and not to mouse-ear cress. In the POST herbicide study, 2,4-D, dicamba, and metribuzin resulted in greater than 75% control in the field and greenhouse. Metribuzin, dicamba, and pyroxsulam resulted in crop injury 3 wk after treatment at some sites, but injury was transient. Yield from all POST treatments was similar to the nontreated plots. No yield loss was observed by mouse-ear cress densities greater than 300 plants m–2, indicating that mouse-ear cress is not very competitive with winter wheat. Growers should make herbicide decisions based on other weeds in the field and can incorporate the aforementioned herbicides for mouse-ear cress control.

Keywords

Mark VanGessel, University of DelawareDicambaflumioxazinmetribuzinpyroxasulfonepyroxsulamsaflufenacilthifensulfuron2,4-Dcommon chickweedStellaria media L.mouse-ear cressArabidopsis thaliana L.wheatTriticum aestivum L.CompetitiondensityPOST controlPRE controlyield loss
Type
Research Article
Information
Weed Technology , Volume 32 , Issue 6 , December 2018 , pp. 671 - 677
Copyright
© Weed Science Society of America, 2018. 

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