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Influence of Application Timing on the Efficacy of Reduced Rate Postemergence Herbicides for Wild Oat (Avena fatua) Control in Spring Barley (Hordeum vulgare)

Published online by Cambridge University Press:  12 June 2017

Robert N. Stougaard ,
Bruce D. Maxwell  and
Jerry D. Harris
Robert N. Stougaard
Affiliation:
Northwestern Agricultural Research Center, Kalispell, MT 59901
Bruce D. Maxwell
Affiliation:
Department of Plant, Soils and Environmental Sciences, Montana State University, Bozeman, MT 59717
Jerry D. Harris
Affiliation:
Central Agricultural Research Center, Moccasin, MT 59462
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Abstract

Field experiments were conducted during 1992 and 1993 at Kalispell and Moccasin, MT, to determine the influence of application timing on the efficacy of reduced rate postemergence applications of imazamethabenz and diclofop in spring barley. Herbicides were applied at their respective 1 × and ½ × use rates at either 1, 2, or 3 weeks after crop emergence (WAE). While excellent wild oat control was sometimes achieved with reduced rates, there was no consistent relationship between wild oat growth stage and the level of control at either site regardless of the herbicide or rate applied. This response suggests that efficacy is governed not only by wild oat growth stage, but also by weed demographics and environmental considerations. Barley yield and adjusted gross return values were highest at Kalispell when imazamethabenz treatments were applied at 1 WAE, regardless of the level of wild oat control. Adjusted gross return values were similar for the 1 × and ½ × imazamethabenz treatments. Yields and adjusted gross returns with diclofop treatments were more related to the level of wild oat control at Kalispell, with the 1 × diclofop treatments providing the greatest yields and adjusted gross return values. The level of wild oat control at Moccasin had minimal effect on barley yield and adjusted gross returns, with both values being comparable to the nontreated check.

Keywords

Diclofop, (±)-2-[4-(2,4-dichlorophenoxy)phenoxy]propanoic acidimazamethabenz, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-4(and 5)-methylbenzoic acid (3: 2), methylesterwild oat, Avena fatua L. # AVEFAspring barley, Hordeum vulgare L.Growth stageinterferencephenologyAVEFAWAE, weeks after crop emergence
Type
Research
Information
Weed Technology , Volume 11 , Issue 2 , June 1997 , pp. 283 - 289
Copyright
Copyright © 1997 by the Weed Science Society of America 

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