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Determining Seasonal Emergence and Control Programs for Henbit (Lamium amplexicaule L.)

Published online by Cambridge University Press:  24 September 2018

Brandi C. Woolam ,
Daniel O. Stephenson IV  and
David C. Blouin
Brandi C. Woolam
Affiliation:
Research Associate, Louisiana State University Agricultural Center, Dean Lee Research and Extension Center, Alexandria, LA, USA
Daniel O. Stephenson IV*
Affiliation:
Professor, Louisiana State University Agricultural Center, Dean Lee Research and Extension Center, Alexandria, LA, USA
David C. Blouin
Affiliation:
Professor, Department of Experimental Statistics, Louisiana State University Agricultural Center, Baton Rouge, LA, USA
*
*Author for correspondence: Daniel O. Stephenson, IV, Professor, Louisiana State University Agricultural Center, Dean Lee Research and Extension Center, 8105 Tom Bowman Drive, Alexandria, LA 71302. (E-mail: dstephenson@agcenter.lsu.edu)
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Abstract

Henbit is a winter annual weed that is not effectively controlled by spring-applied herbicide applications. Research was conducted to determine henbit’s emergence pattern and whether fall-applied residual herbicides would be effective for henbit control in the spring. Henbit emerges in Louisiana from late October through March, but emergence predominantly occurs in the last week of October through the first week of December. Applying paraquat plus flumioxazin, oxyfluorfen, or rimsulfuron:thifensulfuron November 1 through December 15 provided better than 90% henbit control in March. Applying paraquat plus S-metolachlor on November 15 or December 1 provided 92% henbit control, which was similar to flumioxazin, oxyfluorfen, and rimsulfuron:thifensulfuron. The addition of flumioxazin, oxyfluorfen, or rimsulfuron:thifensulfuron to paraquat reduced the height of henbit plants by 4% to 22% of nontreated plants when applied November 1 through December 15. These studies indicate that crop producers can achieve control of henbit in March following November 1 through December 15 applications of paraquat plus flumioxazin or rimsulfuron:thifensulfuron; however, paraquat plus oxyfluorfen can be applied October 15 through December 15 to achieve similar control.

Keywords

Michael Walsh, University of SydneyFlumioxazinoxyfluorfenparaquatrimsulfuron:thifensulfuronS-metolachlorhenbitLamium amplexicaule L. LAMAMFall-applied herbicideresidual control
Type
Weed Management-Techniques
Information
Weed Technology , Volume 32 , Issue 6 , December 2018 , pp. 733 - 738
Copyright
© Weed Science Society of America, 2018. 

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