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Effects of Paraquat on Weed Control and Yield of Alfalfa (Medicago sativa) in Virginia

Published online by Cambridge University Press:  12 June 2017

Chester L. Foy  and
Harold L. Witt
Chester L. Foy
Affiliation:
Dep. Plant Pathol., Physiol., Weed Sci., Va. Polytech. Inst. State Univ., Blacksburg, VA 24061
Harold L. Witt
Affiliation:
Dep. Plant Pathol., Physiol., Weed Sci., Va. Polytech. Inst. State Univ., Blacksburg, VA 24061
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Abstract

Field experiments were conducted during 1981 to 1984 to evaluate paraquat for weed control in alfalfa established for less than one year. Treatments were applied in March to alfalfa up to 4 cm tall and/or after cuttings to alfalfa up to 10 cm tall. Weeds were up to 20 cm tall. Paraquat applied in March controlled common chickweed and shepherd's-purse in some experiments. It did not control birdsrape mustard when applied after cuttings. Paraquat suppressed growth of perennial broadleaf weeds and grasses and reduced pressure from annual grasses in some experiments. March treatments generally did not increase, but sometimes decreased alfalfa yields. Paraquat applied after cuttings did not affect alfalfa yields in the majority of the experiments.

Keywords

Paraquat, 1,1-dimethyl-4,4′-bipyridinium ionbirdsrape mustard, Brassica rapa L. # BRSRAcommon chickweed, Stellaria media (L.) Vill. # STEMEshepherd's-purse, Capsella bursa-pastoris (L.) Medicus # CAPBPalfalfa, Medicago sativa L.ChlorprophamdinosebMCPAsimazineterbacil2,4-DBannual broadleaf weedsannual grassesperennial broadleaf weedsperennial grassesBrassica rapaCapsella bursa-pastorisStellaria mediaBRSRACAPBPSTEME
Type
Research
Information
Weed Technology , Volume 7 , Issue 2 , June 1993 , pp. 495 - 506
Copyright
Copyright © 1993 Weed Science Society of America 

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References

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