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Diffusive Resistance and Transpiration of Quackgrass (Elytrigia repens) Following Postemergence Herbicides

Published online by Cambridge University Press:  12 June 2017

Mark C. Trimmer  and
Dean L. Linscott
Mark C. Trimmer
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Cornell Univ., Ithaca, NY 14853
Dean L. Linscott
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Cornell Univ., Ithaca, NY 14853
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Abstract

An established alfalfa stand infested with quackgrass received fluazifop-P, haloxyfop, or quizalofop at single applications of 0.28 ae kg ha-1 and sequential applications of 0.14 plus 0.14 ae kg ha-1 with the second treatment being made 16 d after the first. All herbicide treatments increased diffusive resistance and decreased transpiration of quackgrass compared to control plants. These effects became apparent 16 d or more after spraying. Visual injury symptoms were noted 8 to 10 d after treatment, several days prior to changes in diffusive resistance or transpiration. The alfalfa content of the first cutting was increased from herbicide treatment; however, total forage yield was reduced. Yields and composition of later cuttings were unaffected by the various herbicide treatments.

Keywords

Fluazifop-P, butyl ester of (R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidhaloxyfop, methyl ester of 2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidquizalofop, ethyl ester of (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy)phenoxy]propanoic acidalfalfa, Medicago sativa L. ‘Oneida’quackgrass, Elytrigia repens (L.) Nevski. ♯3 AGRREFluazifop-PhaloxyfopquizalofopAGRRE
Type
Research
Information
Weed Technology , Volume 4 , Issue 4 , December 1990 , pp. 824 - 827
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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