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Quackgrass (Agropyron repens) Control and Establishment of Three Forage Legumes with Three Selective Herbicides

Published online by Cambridge University Press:  12 June 2017

Craig G. Davidson ,
Donald L. Wyse  and
Robert L. McGraw
Craig G. Davidson
Affiliation:
Dep. Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
Donald L. Wyse
Affiliation:
Dep. Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
Robert L. McGraw
Affiliation:
Dep. Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
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Abstract

Sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} and RO-13-8895 {acetone-O-[d-2-[p-[(α,α,α-trifluoro-p-tolyl)-oxy]phenoxy]propionyl]oxime} were evaluated for quackgrass [Agropyron repens (L.) Beauv. ♯ AGRRE] control in ‘Norcen’ birdsfoot trefoil [Lotus corniculatus (L.)], ‘Monarch’ cicer milkvetch [Astragalus cicer (L.) Hook.], and ‘Arlington’ red clover [Trifolium pratense (L.)]. None of the herbicide treatments applied to weed-free legumes 3, 15, and 30 cm tall reduced crop ground cover or seed yield. Postemergence treatments of sethoxydim and RO-13-8895 applied to quackgrass in the one- to four-leaf stage, at rates from 0.56 to 1.1 kg ai/ha, gave control of 57 to 91% in September of the seedling year. Legumes in all postemergence herbicide-treated plots produced more seed than legumes in untreated plots, regardless of time of application. Sequential applications of sethoxydim, RO-13-8895, or fluazifop {(±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acid} at 0.14 plus 0.14 kg ai/ha gave more effective quackgrass control and greater legume ground cover than single applications at 0.28 kg ai/ha.

Keywords

Legume seed productionLotus corniculatusAstragalus cicerTrifolium pratenseAGRRE
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 33 , Issue 3 , May 1985 , pp. 376 - 380
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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