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Annual Grass Control in Alfalfa (Medicago sativa) with Postemergence Graminicides

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 1982 to 1988 in Virginia to evaluate BAS 517, CGA 82725, clethodim, cloproxydim, fenoxaprop, fluazifop, fluazifop-P, haloxyfop, paraquat, quizalofop, SC-1084, sethoxydim, sethoxydim plus thifensulfuron, and terbacil for control of annual grasses in alfalfa. Herbicides were applied to alfalfa and grasses 2 to 30 cm in height after the first and/or second cuttings. Overall, the herbicides were highly effective in controlling fall panicum, giant foxtail, barnyardgrass, and large crabgrass. Alfalfa yields were not increased with herbicide treatments in several experiments. Only paraquat, applied later than recommended after cutting in one experiment, and sethoxydim plus thifensulfuron at one location reduced alfalfa yields.

Keywords

CGA 82725, 2-propynyl-2-[4-[(3,5-dichloro-2-pyridinyl)oxy]phenoxy]propanoatefenoxaprop, (±)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidfluazifop, (±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidhaloxyfop, 2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidparaquat, 1,1′-dimethyl-4,4′-bipyridinium ionquizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidSC-1084, methyl-3-hydroxy-4-[4-[[5-trifluoromethyl)-2-pyridinyl]oxy]phenoxy]pentanoatealfalfa, Medicago sativa L.barnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGfall panicum, Panicum dichotomiflorum Michx. # PANDIgiant foxtail, Setaria faberi Herrm. # SETFAlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSABAS 517CGA 82725clethodimcloproxydimfenoxapropfluazifopfluazifop-PhaloxyfopparaquatquizalofopSC-1084sethoxydimterbacilthifensulfuronECHCGPANDISETFADIGSA
Type
Research
Information
Weed Technology , Volume 6 , Issue 4 , December 1992 , pp. 938 - 948
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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