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Propanil-Resistant Barnyardgrass (Echinochloa crus-galli) Control in Rice (Oryza sativa)

Published online by Cambridge University Press:  12 June 2017

Aurora M. Baltazar  and
Roy J. Smith Jr.
Aurora M. Baltazar
Affiliation:
Rice Res. and Ext. Ctr., Univ. Arkansas, Stuttgart, AR 72160
Roy J. Smith Jr.
Affiliation:
USDA-ARS, Univ. Arkansas, Stuttgart, AR 72160
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Abstract

Six experiments were conducted in three rice fields near Harrisburg, AR in Poinsett County in 1991 and 1992 to confirm barnyardgrass resistance to propanil and to compare herbicide treatments for control of propanil-resistant barnyardgrass. In all experiments, standard treatments of thiobencarb applied delayed PRE or tank mixtures of propanil + thiobencarb applied POST controlled propanil-resistant barnyardgrass. In five of six experiments, propanil failed to control barnyardgrass at 6 to 8 kg ai/ha (three times use rates) and in three experiments it provided inconsistent control at 11 kg/ha. Emulsifiable propanil at 11 kg/ha frequently controlled resistant barnyardgrass better than the dry flowable formulation. Treatments that consistently controlled propanil-resistant barnyardgrass included propanil tank-mixed with pendimethalin or quinclorac applied POST to two-leaf grass; quinclorac applied alone delayed PRE or POST or applied POST tank-mixed with thiobencarb, pendimethalin, or a formulated mixture of molinate and propanil; a formulated mixture of propanil and molinate applied POST in tank mixtures with thiobencarb or pendimethalin; and fenoxaprop or fenoxaprop-P alone applied POST to four-leaf grass prior to flood establishment. Herbicide treatments that failed to control resistant barnyardgrass included POST applications of a formulated mixture of propanil and molinate alone and propanil in tank mixtures with bromoxynil or triclopyr. These studies confirm that barnyardgrass from several farms in Arkansas have resistance to propanil and identified treatments that control propanil-resistant barnyardgrass.

Keywords

Bromoxynil, 3,5-dibromo-4-hydroxybenzonitrilefenoxaprop, (±)-2-[4[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidfenoxaprop-P, (+)-2-[4[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidmolinate, S-ethyl hexahydro-1H-azepine-1-carbothioatependimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenaminepropanil, N-(3,4-dichlorophenyl)propanamidequinclorac, 3,7-dichloro-8-quinolinecarboxylic acidthiobencarb, S-[(4-chlorophenyl)methyl]diethylcarbamothioatetriclopyr, [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acidbarnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGrice, Oryza sativa L. ‘Newbonnet’ and ‘Tebonnet.’Selectivityherbicide rateherbicide efficacypropanil-resistant barnyardgrassECHCG
Type
Research
Information
Weed Technology , Volume 8 , Issue 3 , September 1994 , pp. 576 - 581
Copyright
Copyright © 1994 by the Weed Science Society of America 

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