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Residues and Efficacy With Fluazifop-P in Alfalfa (Medicago sativa)

Published online by Cambridge University Press:  12 June 2017

Douglas J. Doohan ,
Gilles Belanger ,
Russ R. King  and
Jerry A. Ivany
Douglas J. Doohan
Affiliation:
Weed Spec., New Brunswick Dep. Agric, Fredericton, N. B., Biol, and Res. Sci., Agric. Can. Res. Stn., Fredericton, N. B. and Res. Sci., Agric. Can Res. Stn., Chariottetown, P.E.I. D. J.
Gilles Belanger
Affiliation:
Weed Spec., New Brunswick Dep. Agric, Fredericton, N. B., Biol, and Res. Sci., Agric. Can. Res. Stn., Fredericton, N. B. and Res. Sci., Agric. Can Res. Stn., Chariottetown, P.E.I. D. J.
Russ R. King
Affiliation:
Weed Spec., New Brunswick Dep. Agric, Fredericton, N. B., Biol, and Res. Sci., Agric. Can. Res. Stn., Fredericton, N. B. and Res. Sci., Agric. Can Res. Stn., Chariottetown, P.E.I. D. J.
Jerry A. Ivany
Affiliation:
Weed Spec., New Brunswick Dep. Agric, Fredericton, N. B., Biol, and Res. Sci., Agric. Can. Res. Stn., Fredericton, N. B. and Res. Sci., Agric. Can Res. Stn., Chariottetown, P.E.I. D. J.
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Abstract

Fluazifop-P, applied in the spring or fall and pronamide, applied in the fall only, reduced quackgrass infestation in established alfalfa and increased the dry matter yield of alfalfa. Herbicides did not improve alfalfa in vitro digestibility or crude protein content. Average residues of fluazifop-P in alfalfa treated with rates of 0.25 or 0.5 kg ai ha–1, were 0.1 mg kg–1 when harvested 280 d after application, and 0.06 mg kg–1 when harvested 295 d after application. Average residues in alfalfa harvested 41 and 55 d after application were 0.13 mg kg–1 and 0.1 mg kg–1, respectively, with a 0.25 kg ha–1 treatment and 0.19 mg kg–1 and 0.05 mg kg–1, respectively, with a 0.5 kg ha–1 treatment.

Keywords

Fluazifop-P, (R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]-oxy]phenoxy]propanoic acidpronamide, 3, 5-dichloro(N-1,1-dimethyl-2-propynyl)benzamidealfalfa (Medicago sativa L.)quackgrass [Elytrigia repens (L.) Nevski ♯ AGGRE]Alfalfa yield and qualityfluazifop-PpronamideAGGRE
Type
Research
Information
Weed Technology , Volume 6 , Issue 1 , March 1992 , pp. 25 - 30
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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