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Rice (Oryza sativa) Response and Annual Grass Control with Graminicides

Published online by Cambridge University Press:  20 January 2017

Nathan W. Buehring,
Ronald E. Talbert and
Ford L. Baldwin
Nathan W. Buehring*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704
Ronald E. Talbert
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704
Ford L. Baldwin
Affiliation:
University of Arkansas Cooperative Extension Service, Little Rock, AR 72204
*
Corresponding author's E-mail: nathanb@ext.msstate.edu
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Abstract

Field studies were conducted to evaluate rice injury and control of propanil-resistant and -susceptible (natural infestation) barnyardgrass, broadleaf signalgrass, and Amazon sprangletop with BAS 625, cyhalofop, and fenoxaprop plus the safener isoxadifen in rice. BAS 625 at 100 g ai/ha applied to two- to three-leaf rice resulted in 19 to 72% injury in three of four experiments. Fenoxaprop plus isoxadifen at 90 + 98 g ai/ha injured rice 11 to 31%, and cyhalofop at 280 g ai/ha consistently resulted in minimal rice injury. The most effective control (84 to 99%) of propanil-resistant and propanil-susceptible barnyardgrass across all experiments was achieved with sequential applications of the BAS 625 at 75 and 100 g ai/ha, cyhalofop at 210 and 280 g ai/ha, and fenoxaprop plus isoxadifen at 68 + 74 and 90 + 98 g ai/ha. When the graminicides were applied to four- to six-leaf rice (one tiller), propanil-resistant and propanil-susceptible barnyardgrass control was generally very poor. Fenoxaprop plus isoxadifen controlled broadleaf signalgrass 91 to 100%, even when applied once to four- to six-leaf rice. BAS 625 at 75 and 100 g ai/ha and cyhalofop at 210 and 280 g ai/ha applied sequentially provided consistent broadleaf signalgrass control (≥98%). Amazon sprangletop control was good (85 to 99%) with fenoxaprop plus isoxadifen at 45 + 49, 68 + 74, and 90 + 98 g ai/ha (applied in a single application or sequentially), BAS 625 at 100 g ai/ha applied to two- to three-leaf and four- to six-leaf rice or 50, 75, and 100 g ai/ha applied sequentially, and cyhalofop at 140, 210, and 280 g ai/ha applied to two- to three-leaf rice or sequentially.

Keywords

BAS 625, 2-[1-[2-(4-chlorophenoxy)propoxyimino]-butyl]3-oxo-5-thian-3-ylcyclohex-1-enolcyhalofopfenoxapropisoxadifen (4,5-dihydro-5,5-diphenyl-3-isoxazolecarboxylic acid)Amazon sprangletop, Leptochloa panicoides (Presl.) Hitchc. # LEFPAbarnyardgrass Echinochloa crus-galli (L.) Beauv. #3 ECHCGbroadleaf signalgrass, Brachiaria platyphylla (Griseb.) Nash. # BRAPPrice, Oryza sativa L.Application timingACCase, acetyl-CoA carboxylaseWAT, weeks after treatment

Information

Type
Research Article
Information
Weed Technology , Volume 20 , Issue 3 , September 2006, pp. 738 - 744
Copyright
Copyright © Weed Science Society of America 

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