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The Effects of Selected Herbicides on Musk Thistle (Carduus nutans) Viable Achene Production

Published online by Cambridge University Press:  12 June 2017

K. George Beck ,
Robert G. Wilson  and
M. Ann Henson
K. George Beck
Affiliation:
Colo. State Univ., Ft. Collins, CO 80523
Robert G. Wilson
Affiliation:
Univ. Nebr., Panhandle Res. Ext. Cent., Scottsbluff, NE 69361
M. Ann Henson
Affiliation:
Development Representative E. I. du Pont de Nemours & Co., Inc., Longmont, CO 80501
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Abstract

Chlorsulfuron, metsulfuron, clopyralid, 2,4-D, picloram, and dicamba plus 2,4-D were spring-applied to musk thistle in rosette, bolting, bud, and early flower growth stages. All treatments reduced viable achene production at all musk thistle growth stages at Mcgrew, NE, and Longmont, CO. However, differences occurred at Evergreen, CO, among treatments and growth stages. No achenes developed at Evergreen when herbicides were applied during the rosette stage with dicamba plus 2,4-D, picloram, or metsulfuron at 21 g ai/ha or during bolting with chlorsulfuron or metsulfuron at 21 g/ha. Chlorsulfuron applied during early bloom reduced viable achene production over 99% compared to untreated plants and the picloram treatment.

Keywords

Chlorsulfuron, 2-chloroN-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]-carbonyl]benzenesulfonamideclopyralid, 3,6-dichloro-2-pyridinecarboxylic aciddicamba, 3,5-dichloro- 2-methoxybenzoic acidmetsulfuron, 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino] carbonyl]amino]sulfonyl]benzoic acidpicloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid2,4-D, (2,4-dichlorophenoxy)acetic acidmusk thistle, Carduus nutans L. ♯3 CRUNUSeed inhibitionclopyraliddicambapicloram2,4-DRhinocyllus conicusCRUNU
Type
Research
Information
Weed Technology , Volume 4 , Issue 3 , September 1990 , pp. 482 - 486
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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