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Volunteer Barley (Hordeum vulgare) Control in Winter Wheat (Triticum aestivum) with MON 37500

Published online by Cambridge University Press:  12 June 2017

Sandra L. Shinn ,
Donald C. Thill  and
William J. Price
Sandra L. Shinn*
Affiliation:
Department of Plant, Soil and Entomological Sciences, University of Idaho, Moscow, ID 83844-2339
Donald C. Thill
Affiliation:
Department of Plant, Soil and Entomological Sciences, University of Idaho, Moscow, ID 83844-2339
William J. Price
Affiliation:
Statistical Programs, University of Idaho, Moscow, ID 83844-2339
*
Corresponding author's E-mail: shin9545@uidaho.edu.
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Abstract

Spring barley often is grown in rotation with winter wheat, and sometimes barley can overwinter in the subsequent winter wheat crop reducing grain yield and quality. Studies were established during 1996 and 1997 in winter wheat fields in southeastern Washington and near Moscow, ID, respectively, to evaluate control of ‘Steptoe’ volunteer barley with MON 37500, diclofop, and fenoxaprop/2,4-D/MCPA. Herbicides were applied to volunteer barley at two growth stages: two leaves to four tillers and more than four tillers with stems beginning to elongate. MON 37500 at 0.018, 0.026, and 0.035 kg ai/ha visibly controlled volunteer barley 83% or more at both application times. Diclofop at 1.12 kg ai/ha did not control volunteer barley, whereas fenoxaprop/2,4-D/MCPA at 0.66 kg ai/ha controlled volunteer barley 64 to 97% in 1996, but only 0 to 23% in 1997. In 1996 and 1997, volunteer barley density was reduced 80 to 99% in MON 37500-treated plots compared to the untreated control plots. Wheat grain grade was #1 for all MON 37500 treatments compared to grade #4 in 1996 and #3 in 1997 in the untreated plots. Grain price was reduced by dockage (barley kernels) for MON 37500-treated wheat $0 to $3.12/metric ton (MT), whereas price was reduced $23 to $26/MT for grain from untreated plots. In greenhouse studies, visible injury and height and biomass reduction varied among the 36 barley varieties treated with MON 37500.

Keywords

Diclofop-methyl, methyl 2-[4-(2,4-dichlorophenoxy)phenoxy]propanoatefenoxaprop/2,4-D/MCPA, fenoxaprop-p-ethyl, (+)-ethyl 2-[4-[(6-chloro-2-benzoxazoly)oxy]phenoxy]propanoate2,4-D isooctylester, 2-ethylhexyl-(2,4-dichlorophenoxy)acetateMCPA isooctylester, isooctyl(4-chloro-2-methyl-phenoxy)acetateMON 37500, 1-(2-ethylsulfonylimidazo[1,2-a]pyridin-3-ylsulfonyl)-3-(4,6-dimethoxypyrimidin-2-yl)ureavolunteer barley, Hordeum vulgare L. ‘Steptoe'winter wheat, Triticum aestivum L. ‘Madsen.'Grain gradepercent dockageES, early springLS, late springMT, metric tonNIS, nonionic surfactantOM, organic matterPOST, postemergenceSS, silicone surfactant
Type
Research
Information
Weed Technology , Volume 13 , Issue 1 , March 1999 , pp. 88 - 93
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

1

Published with approval of the Agriculture Experiment Station, University of Idaho, as Journal Article 98706.

References

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