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Response of Yankeeweed (Eupatorium compositifolium) and Associated Pasture Plants to Herbicides

Published online by Cambridge University Press:  12 June 2017

Robert E. Meyer  and
Rodney W. Bovey
Robert E. Meyer
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Dep. Range Sci., Texas A&M Univ., College Station, TX 77843
Rodney W. Bovey
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Dep. Range Sci., Texas A&M Univ., College Station, TX 77843
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Abstract

Eleven herbicides applied in May, were evaluated for yankeeweed control in East-Central Texas. Yankeeweed cover 1 yr later was reduced to 5% or less by 0.28 kg ha-1 of picloram; 0.56 kg ha-1 of clopyralid, glyphosate, or dicamba; 0.28 + 0.84 kg ha-1 of dicamba + 2,4-D, and 1.1 kg ha-1 triclopyr compared with 30% cover in the untreated area. Chlorsulfuron and metsulfuron at 0.07 kg ha-1 reduced yankeeweed cover to 12 and 7%, respectively. Dalapon, 2,4-D, and tebuthiuron were relatively ineffective. Most herbicides, reduced woolly croton cover within 1 mo after treatment compared to the untreated areas, but 2,4-D at 0.28 kg ha-1 and chlorsulfuron at 0.02 kg ha-1 and 0.07 kg ha-1 were most effective after 4 mo. All herbicides, except dalapon at 1.1 kg ha-1 or less and most rates of 2,4-D and tebuthiuron, reduced partridgepea cover during the year of application. Total grass cover was increased 4 and 12 mo following treatment with clopyralid, picloram, dicamba, and triclopyr. On separate sites, bahiagrass and coastal bermudagrass accounted for most of the increased grass cover.

Keywords

clopyralid, 3,6-dichloro-2-pyridinecarboxylic aciddalapon, 2,2-dichloropropanoic aciddicamba, 3,6-dichloro-2-methoxybenzoic acid2,4-D, (2,4-dichlorophenoxy)acetic acidglyphosate, N-(phosphonomethyl)glycinepicloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acidtriclopyr, [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acidyankeeweed, Eupatorium compositifolium Walt. ♯ EUPCObahiagrass, Paspalum notatum Fluegge ♯ PASNOcoastal bermudagrass, Cynodon dactylon (L.) Pers. ♯ CYNDApartridgepea, Cassia fasciculata Michx. ♯ CASFAwoolly croton, Croton capitatus Michx. ♯ CVNCPPaspalum notatumCynodon dactylonCassia fasciculataCroton capitatusPASNOCYNDACASFACVNCP
Type
Note
Information
Weed Technology , Volume 5 , Issue 1 , March 1991 , pp. 214 - 217
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

Literature Cited

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