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Herbicide Programs for Managing Creeping Rivergrass (Echinochloa polystachya) in Rice

Published online by Cambridge University Press:  20 January 2017

Eric P. Webster*
Affiliation:
School of Plant, Environmental, and Soil Sciences, Louisiana State University Agricultural Center, 104 M. B. Sturgis Hall, Baton Rouge, LA 70803
R. Matthew Griffin
Affiliation:
School of Plant, Environmental, and Soil Sciences, Louisiana State University Agricultural Center, 104 M. B. Sturgis Hall, Baton Rouge, LA 70803
David C. Blouin
Affiliation:
Department of Experimental Statistics, 45 Agriculture Administration Building, Louisiana State University, Baton Rouge, LA 70803
*
Corresponding author's E-mail: ewebster@agcenter.lsu.edu

Abstract

A study was established to evaluate herbicides registered for barnyardgrass control in rice for activity on creeping rivergrass. Treatments included 208 g ai/ha cyhalofop early POST (EPOST) followed by (fb) 315 g/ha cyhalofop late POST (LPOST), 22 g ai/ha bispyribac EPOST fb 22 g/ha bispyribac LPOST, 66 g ai/ha fenoxaprop EPOST fb 86 g/ha fenoxaprop LPOST, 70 g ai/ha imazethapyr EPOST fb 70 g/ha imazethapyr LPOST and 50 g ai/ha penoxsulam mid-POST (MPOST). Each POST program was evaluated with and without 448 g ai/ha clomazone PRE. Barnyardgrass control, averaged over days after treatment (DAT), was 88 to 92% with the addition of clomazone PRE. Clomazone applied PRE followed by two applications of cyhalofop controlled creeping rivergrass at 91%. Creeping rivergrass control was less than 75% at 35 to 49 DAT. This response indicates only suppression of creeping rivergrass is achieved with the herbicide programs evaluated in this study.

Information

Type
Research
Copyright
Copyright © Weed Science Society of America 

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