Carrot weed management programs without linuron herbicide. (June 2019)

• Record Type: Journal Article
• Authors: Colquhoun, Jed B.; Rittmeyer, Richard A.; Heider, Daniel J.
• Is Part Of: Weed technology. Volume 33:Number 3(2019)
• Page Start: 490
• Page End: 494
• Publication Date: 2019-06
• Subjects: Steve Fennimore, University of California, Davis; Linuron, -- pendimethalin, -- prometryn, -- S-metolachlor, -- carrot, Daucus carota L; Integrated weed management, -- specialty crops, -- vegetable crops; Weeds -- Periodicals; Weeds -- Control -- Periodicals; 632.5
• DOI: 10.1017/wet.2018.122
• Languages: English
• ISSNs: 0890-037X

Abstract

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 .