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Canada Thistle (Cirsium arvense) Control in Sugarbeet with Clopyralid

Published online by Cambridge University Press:  12 June 2017

Karen A. Renner
Karen A. Renner*
Affiliation:
Dep. Crop Soil Sci., Mich. State Univ., E. Lansing, MI 48824
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Abstract

Sugarbeet tolerance to and Canada thistle control from tank mixtures of clopyralid plus other postemergence herbicides and/or petroleum oil adjuvant applied at various times were determined. Herbicides were applied to 5 to 20 or 20 to 70-cm tall Canada thistle. Clopyralid at 0.14 and 0.21 kg ai ha-1 alone or with petroleum oil adjuvant did not injure sugarbeet. Tank mixing clopyralid with desmedipham/phenmedipham plus endothall injured sugarbeet 7 d after application in 2 of 3 yr but not when observed 14 d after application. Herbicides applied early postemergence in 1987 and late postemergence in 1988 controlled Canada thistle poorly due to rainfall 1 h after application and drought conditions, respectively. The addition of petroleum oil adjuvant enhanced control of Canada thistle by clopyralid at 0.14 kg ha-1, and control equaled that of clopyralid at 0.21 kg ha-1 alone. Addition of desmedipham/phenmedipham plus endothall to clopyralid did not reduce Canada thistle control. Petroleum oil adjuvant added to clopyralid at 0.14 kg ha-1 increased Canada thistle control to that achieved by clopyralid at 0.21 kg ha-1 plus desmedipham/phenmedipham plus endothall.

Keywords

Clopyralid, 3,6-dichloro-2-pyridinecarboxylic aciddesmedipham, ethyl [3-[[(phenylamino)carbonyl]oxy]phenyl]carbamateendothall, 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acidphenmedipham, 3-[(methoxycarbonyl)amino] phenyl (3-methylphenyl)carbamateCanada thistle, Cirsium arvense (L.) Scop. ♯ CIRARsugarbeet, Beta vulgaris L.Crop oil concentrateinteractionspetroleum oil adjuvantphytotoxicityBeta vulgarisCIRAR
Type
Research
Information
Weed Technology , Volume 5 , Issue 2 , June 1991 , pp. 392 - 395
Copyright
Copyright © 1991 Weed Science Society of America 

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References

Literature Cited

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