Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-27T05:06:53.205Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

1. Hagood, E. S., Swann, C. W., Wilson, H. P., Ritter, R. L., and Webb, F. J. 1992. Weed Control in Forage Crops. p. 205–211 in Pest Management Guide for Field Crops. Va. Coop. Ext. Serv., Publ. 456–016.Google Scholar
2. ICI Americas, Inc. 1991. Gramoxone® Extra Herbicide. p. 88–102 in 1992 Product Specimen Labels, Agricultural Products, ICI Americas, Inc., Wilmington, DE 19897.Google Scholar
3. Kapusta, G. and Strieker, C. F. 1975. Selective control of downy brome in alfalfa. Weed Sci. 23:202–206.Google Scholar
4. Peters, E. J., McKelvey, R. A., and Mattas, R. 1984. Controlling weeds in dormant and nondormant alfalfa (Medicago sativa). Weed Sci. 32:154–157.CrossRefGoogle Scholar
5. Robinson, L. R., Williams, C. F., and Laws, W. D. 1978. Weed control in established alfalfa (Medicago sativa). Weed Sci. 26:37–40.Google Scholar
6. Smith, A. E. 1991. Paraquat for managing weeds in alfalfa (Medicago sativa). Weed Technol. 5:181–184.Google Scholar
7. Wolf, D. D. and Foy, C. L. 1984. Alfalfa yield response to a between-cutting contact herbicide. Crop. Sci. 24:645–648.Google Scholar
8. Wolf, D. D., Kirby, B. W., and Foy, C. L. 1983. Weed control in alfalfa: an after-cutting herbicide application. Crop Soils Mag. (March): 13–14.Google Scholar