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Herbicides for Control of Tall Larkspur (Delphinium barbeyi)

Published online by Cambridge University Press:  12 June 2017

Michael H. Ralphs ,
David L. Turner ,
Larry V. Mickelsen ,
John O. Evans  and
Steven A. Dewey
Michael H. Ralphs
Affiliation:
Agric. Res. Ser., U.S. Dep. Agric. Poisonous Plant Res. Lab., 1150 E. 1400 N. Logan, UT 84321
David L. Turner
Affiliation:
Plant Sci., Utah State Univ., Logan, UT 84322. Utah Agric. Exp. Stn. J. Paper No. 3949
Larry V. Mickelsen
Affiliation:
Plant Sci., Utah State Univ., Logan, UT 84322. Utah Agric. Exp. Stn. J. Paper No. 3949
John O. Evans
Affiliation:
Agric. Res. Ser., U.S. Dep. Agric. Poisonous Plant Res. Lab., 1150 E. 1400 N. Logan, UT 84321
Steven A. Dewey
Affiliation:
Agric. Res. Ser., U.S. Dep. Agric. Poisonous Plant Res. Lab., 1150 E. 1400 N. Logan, UT 84321
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Abstract

Control of tall larkspur on mountain rangelands would substantially reduce cattle poisoning. Several herbicides were evaluated for their control of tall larkspur in subalpine and aspen vegetation types. Glyphosate (2.2 kg ai ha−1) and picloram (2.2 kg ae ha−1) killed more than 88% of larkspur plants in both vegetation types. Clopyralid and triclopyr were ineffective at comparable rates. Metsulfuron (88 and 138 g ai ha−1) provided variable control. Glyphosate is nonselective and killed all perennial vegetation, except for Thurbers fescue and mountain brome in the aspen type. Picloram applied at 4.5 kg ha−1 suppressed grasses on the subalpine site, but allowed grasses to increase at lower rates. All herbicides reduced forb cover.

Keywords

Monoethanolamine salt of clopyralid, 3,6-dichloro-2-pyridinecarboxylic acidglyphosate, (N-phosphonomethyl)glycinemetsulfuron, 2-[[[[(4 - methoxy - 6 - methyl - 1,3,5 - triazin-2-yl)amino]carbonyl]amino] sulfonyl]benzoic acidpotassium salt of picloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acidbutoxyethyl ester of triclopyr [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acidtall larkspur [Delphinium barbeyi (L.) Huth. # DELBA], Thurbers fescue (Festuca thurberi Vasey)mountain brome (Bromus carinatus Hook. & Arn.)quaking aspen (Populus tremuloides Michx.)Poisonous plantclopyralidglyphosatemetsulfuronpicloramtriclopyrDELBA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 38 , Issue 6 , November 1990 , pp. 573 - 577
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

Literature Cited

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