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Carrot weed management programs without linuron herbicide

Published online by Cambridge University Press:  21 March 2019

Jed B. Colquhoun Open the ORCID record for Jed B. Colquhoun [Opens in a new window] ,
Richard A. Rittmeyer  and
Daniel J. Heider
Jed B. Colquhoun*
Affiliation:
Professor, Department of Horticulture, University of Wisconsin–Madison, Madison, WI, USA
Richard A. Rittmeyer
Affiliation:
Senior Research Specialist, Department of Horticulture, University of Wisconsin–Madison, Madison, WI, USA
Daniel J. Heider
Affiliation:
Distinguished Outreach Specialist, Department of Horticulture, University of Wisconsin–Madison, Madison, WI, USA
*
Author for correspondence: Jed B. Colquhoun, Email: colquhoun@wisc.edu
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Abstract

Linuron herbicide has been a mainstay of carrot weed management for years, but uncertainty around regulatory registration review and an increased prevalence of herbicide-resistant weeds have spurred interest in identifying alternatives that can be readily adopted in production. With this context in mind, herbicide programs were evaluated on a coarse-textured, low organic matter soil in 2015 and 2016. Season-long weed control without compromising yield was possible with weed management programs that included prometryn POST instead of linuron. With that said, a PRE herbicide such as pendimethalin was critical to establish an early-season competitive advantage for carrot plants over weeds, and careful attention should be paid to the prometryn rate, as selectivity is marginal. Carrot is often interseeded with a grain nurse crop to mitigate risk of wind erosion. Nurse crop injury was minimal where S-metolachlor, pendimethalin, or prometryn was applied at rates labeled for PRE use in carrot, with the exception of where prometryn was applied at rates above 1.1 kg ai ha−1.

Keywords

Steve Fennimore, University of California, DavisLinuronpendimethalinprometrynS-metolachlorcarrot, Daucus carota LIntegrated weed managementspecialty cropsvegetable crops
Type
Research Article
Information
Weed Technology , Volume 33 , Issue 3 , June 2019 , pp. 490 - 494
Copyright
© Weed Science Society of America, 2019 

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