Hostname: page-component-848d4c4894-jbqgn Total loading time: 0 Render date: 2024-06-14T04:09:11.287Z Has data issue: false hasContentIssue false
  • English
  • Français

Herbicidal Control of Duncecap Larkspur (Delphinium occidentale)

Published online by Cambridge University Press:  12 June 2017

Larry V. Mickelsen ,
Michael H. Ralphs ,
David L. Turner ,
John O. Evans  and
Steven A. Dewey
Larry V. Mickelsen
Affiliation:
USDA, Agric. Res. Serv., U.S. Dep. Agric. Poisonous Plant Res. Lab., 1150 E. 1400 N. Logan, UT 84321
Michael H. Ralphs
Affiliation:
USDA, Agric. Res. Serv., U.S. Dep. Agric. Poisonous Plant Res. Lab., 1150 E. 1400 N. Logan, UT 84321
David L. Turner
Affiliation:
Math. and Stat., Utah State Univ., Logan, UT 84322
John O. Evans
Affiliation:
Plant Sci., Utah State Univ., Logan, UT 84322
Steven A. Dewey
Affiliation:
Plant Sci., Utah State Univ., Logan, UT 84322
Get access Rights & Permissions [Opens in a new window]

Abstract

Several herbicides were evaluated for their ability to control duncecap larkspur, a serious poisonous plant on mountain rangelands in the western U.S. Duncecap larkspur density was reduced from 33 to 93% by triclopyr applied at 2.2, 4.5, and 9.0 kg ae/ha. Picloram applied at 2.2 and 4.5 kg ae/ha reduced density from 33 to 99%. Metsulfuron applied at 86 and 138 g ai/ha reduced density from 50 to 98%. Glyphosate was the most effective herbicide, reducing density by 90 to 100% when applied at 2.2 kg ai/ha. Glyphosate reduced the cover of grasses and perennial forbs but increased cover of annual forbs. All rates of picloram and metsulfuron reduced forb cover. Grass cover increased in most plots where duncecap larkspur and forbs were reduced.

Keywords

Glyphosate, N-(phosphonomethyl)glycinemetsulfuron, 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 acidtriclopyr, [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acidduncecap larkspur, Delphinium occidentale S. Wats. ♯ DELOCPoisonous plantrangelandtriclopyrpicloramclopyralidglyphosatemetsulfuronDELOC
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 38 , Issue 2 , March 1990 , pp. 153 - 157
Copyright
Copyright © 1990 by the Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

1. Alley, H. P. and Lee, G. 1970. What can be done about controlling larkspur on western rangelands. Down Earth 26:31–32.Google Scholar
2. Binns, W., James, L. F., and Johnson, A. E. 1971. Control of larkspur with herbicides plus nitrogen fertilizer. J. Range Mange. 24:110–113.Google Scholar
3. Cook, C. W. and Stubbendieck, J., eds. 1986. Range Research: Basic Problems and Techniques. Soc. for Range Manage., Denver, CO. Pages 57–58.Google Scholar
4. Cronin, E. H. 1974. Evaluation of some herbicide treatments for controlling tall larkspur. J. Range Manage. 27:219–222.CrossRefGoogle Scholar
5. Cronin, E. H. and Nielsen, D. B. 1972. Controlling tall larkspur on snowdrift areas in the subalpine zone. J. Range Manage. 25:213–216.Google Scholar
6. Kingsbury, J. M. 1964. Poisonous Plants of the United States and Canada. Prentice-Hall, Inc., Englewood Cliffs, NJ. Pages 131–140.Google Scholar
7. Nielsen, D. B. and Cronin, E. H. 1977. Economics of tall larkspur control. J. Range Manage. 30:434–438.Google Scholar
8. Nielsen, D. B. and Ralphs, M. H. 1988. Pages 119–129 in James, L. F., Ralphs, M. H., and Nielsen, D. B., eds. The Ecology and Economic Impact of Poisonous Plants on Livestock Production. Westview Press, Boulder, CO.Google Scholar
9. Ralphs, M. H. and Turner, D. L. 1989. Difficulty in controlling duncecap larkspur. Weed Technol. 3:335–339.Google Scholar
10. Torell, P. J. and Haas, R. H. 1963. Herbicidal control of tall larkspur. Weeds 11:10–13.CrossRefGoogle Scholar
11. Turner, D. L., Ralphs, M. H., Mickelsen, L. V., and Evans, J. O. 1990. Logistic analysis for analysis of herbicide data. Weed Technol. (In review).Google Scholar
12. Williams, M. C. and Cronin, E. H. 1968. Dormancy, longevity, and germination of seed of three larkspurs and western false hellebore. Weeds 16:381–384.Google Scholar