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Carpeted Roller Application of Herbicides for Larkspur (Delphinium spp.) Control

  • F. Brent Bunderson (a1), Michael H. Ralphs (a1), John O. Evans (a2), Christopher A. Call (a3) and Darwin B. Nielsen (a4)...


A carpeted roller applicator and broadcast sprayer were compared for application of glyphosate, metsulfuron, and picloram to control duncecap and tall larkspur on mountain range sites in southern Idaho and central Utah, respectively. Glyphosate was the most effective herbicide, controlling 96% of both larkspur species when applied by the sprayer and 78% when applied by the roller. There was no difference in larkspur control between application methods using metsulfuron or picloram. Application of herbicides by the carpeted roller was less detrimental to forbs compared to the sprayer, and the roller application of glyphosate did not reduce grass cover. Grass cover doubled following treatments with picloram and metsulfuron.



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1. Mayeux, H. A. and Crane, R. A. 1983. The brush roller—an experimental herbicide applicator with potential for range weed and brush control. Rangelands 5:5356.
2. Messersmith, C. G. and Lym, R. G. 1985. Roller application of picloram for leafy spurge control in pastures. Weed Sci. 33:258262.
3. Nielsen, D. B. and Ralphs, M. H. 1988. Larkspur: economic considerations. p. 119130 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.
4. Ralphs, M. H., Evans, J. O., and Dewey, S. A. 1992. Timing of herbicide applications for control of larkspurs (Delphinium spp.). Weed Sci. 40:264269.
5. Ralphs, M. H., Mickelsen, L. V., Evans, J. O. and Dewey, S. A. 1991. Selective application of glyphosate for control of larkspurs (Delphinium spp.) Weed Technol. 5:229231.



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