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Survey and Control of Musk Thistle (Carduus nutans) in Tennessee Field Nurseries

Published online by Cambridge University Press:  12 June 2017

David W. Monks ,
Mark A. Halcomb  and
Elmer L. Ashburn
David W. Monks
Affiliation:
Ext. Plant Soil Sci., Univ. Tenn., Knoxville, TN 37901-1071
Mark A. Halcomb
Affiliation:
Ext. Plant Soil Sci., Univ. Tenn., Knoxville, TN 37901-1071
Elmer L. Ashburn
Affiliation:
Ext. Plant Soil Sci., Univ. Tenn., Knoxville, TN 37901-1071
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Abstract

Grower response from a mail survey indicated that musk thistle is a common and spreading problem in Tennessee nurseries. Poor herbicide selection and timing were reasons for the lack of control in most nurseries. At 31 wk after treatment preemergence herbicides or herbicide mixtures that gave 80% or greater musk thistle control in evaluation studies were atrazine, simazine, simazine + metolachlor (1.1 + 4.4 kg ai ha-1), oryzalin + isoxaben, or dithiopyr. Oryzalin, metolachlor, napropamide, or simazine + metolachlor (0.5 + 2.2 kg ha-1) gave 65, 35, 0 and 78% control of musk thistle, respectively. Glyphosate or SC-0224 at 1.7 and 2.2 kg ha-1 gave 89% or greater control of emerged musk thistle. Lactofen or HOE-39866 at 0.8 kg ha-1 gave less than 66% control of emerged musk thistle at 8 wk after treatment.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminedithiopyr, S,S-dimethyl 2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)3,5-pyridinecarbothioateglyphosate, N-(phosphonomethyl)glycineHOE-39866, ammonium (3-amino-3-carboxypropyl)methylphosphinate]isoxaben, N-[3-(1-ethyl-1-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamidelactofen, (±)-2-ethoxy-1-methyl-2-oxoethyl 5-[2-chloro-4-[(trifluoromethyl)phenoxy]-2-nitrobenzoatemetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamidemusk thistle, Carduus nutans L. ♯ CRUNUnapropamide, N,N-diethyl-2-(1-naphthalenyloxy)propanamideoryzalin, 4-(dipropylamino)-3,5-dinitrobenzenesulfonamideSC-0224, trimethylsulfonium carboxymethylaminomethylphosphonatesimazine, 6-chloro-N,N′-diethyl-1,3,5-triazine-2,4-diamineAtrazinedithiopyrglyphosateHOE-39866isoxabenlactofenmetolachlornapropamideoryzalinsimazineSC-0224CRUNU
Type
Education
Information
Weed Technology , Volume 5 , Issue 1 , March 1991 , pp. 218 - 220
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

Literature Cited

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