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Selective Application of Glyphosate for Control of Larkspurs (Delphinium spp.)

Published online by Cambridge University Press:  12 June 2017

Michael H. Ralphs ,
Larry V. Mickelsen ,
John O. Evans  and
Steven A. Dewey
Michael H. Ralphs
Affiliation:
U.S. Dep. Agric., Poisonous Plant Res. Lab., 1150 E. 1400 N., Logan, UT 84321
Larry V. Mickelsen
Affiliation:
U.S. Dep. Agric., Poisonous Plant Res. Lab., 1150 E. 1400 N., Logan, UT 84321
John O. Evans
Affiliation:
U.S. Dep. Agric., Poisonous Plant Res. Lab., 1150 E. 1400 N., Logan, UT 84321
Steven A. Dewey
Affiliation:
Plant Sci., Utah State Univ., Logan, UT 84322
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Abstract

Glyphosate effectively kills duncecap and tall larkspur on mountain rangelands but it is nonselective and kills all other vegetation it contacts. Two selective application methods to treat individual plants were compared to demonstrate their efficacy in controlling larkspur and their effect on associated plant species: (1) spot spray with glyphosate concentration at 2% product solution (0.8% ai); (2) hand held wiper applicator with glyphosate concentration at 33% production solution (13.5% ai). The two methods were equally effective in killing most of the larkspur plants, but the sprayer applicator was more rapid and easier to apply. Neither method adversely affected foliar cover of associated perennial species. Glyphosate must be applied to the entire plant to ensure its mortality.

Keywords

Glyphosate, N-(phosphonomethyl)glycineduncecap larkspur (Delphinium occidentale S. Wats. ♯ DELOC)tall larkspur [D. barbeyi (L.) Huth. ♯ DELBA]Poisonous plantselective application
Type
Education
Information
Weed Technology , Volume 5 , Issue 1 , March 1991 , pp. 229 - 231
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

Literature Cited

1. Cronin, E. H. 1976. Impact on associated vegetation of controlling tall larkspur. J. Range Manage. 29:202–206.CrossRefGoogle Scholar
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