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Response of Broom Snakeweed (Gutierrezia sarothrae) and Cool-Season Grasses to Defoliation

Published online by Cambridge University Press:  20 January 2017

Michael H. Ralphs
Michael H. Ralphs*
Affiliation:
USDA/ARS Poisonous Plant Lab., 1150 E. 1400 N., Logan UT 84341
*
Corresponding author's E-mail: [email protected]
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Abstract

Broom snakeweed is one of the most widespread range weeds in western North America. Although a native plant, it increases with disturbance such as overgrazing, fire, and drought, and can dominate sites. The objective of this study was to test the hypothesis that defoliation of broom snakeweed alone, and along with associated grasses, would reduce its vigor and increase its mortality in bunchgrass plant communities. The study was conducted at two locations: near Nephi, UT in an invaded crested wheatgrass stand and at Howell, UT in a bluebunch wheatgrass/Wyoming big sagebrush community. Clipping treatments consisted of (1) untreated Control; (2) All Clip—clipping all herbaceous vegetation 2 cm above the soil surface, and current season foliar growth of snakeweed; (3) Grass Clip—clipping all grass and forb plants; (4) Snakeweed Clip—clipping current season foliar growth. Treatments were randomly assigned to 1-m2 plots and clipped in May or late August. Plots were measured and clipped at the respective seasons annually from 2004 to 2007. Defoliation of snakeweed in spring in the Snakeweed Clip treatment caused higher mortality and lower size and vigor of remaining plants than the other treatments at the end of the study. Clipping all vegetation also reduced snakeweed density at Nephi, but not at Howell. There was little regrowth of bluebunch wheatgrass at Howell in the All Clip treatment; thus, it was likely to have not competed with snakeweed regrowth for limited soil moisture. Bluebunch wheatgrass cover declined at Howell in the All and Grass Clip treatments. Crested wheatgrass was not adversely affected by spring defoliation in the All and Grass Clip treatments, and it increased in the Snakeweed Clip treatment. There were few differences in the fall defoliations. Spring defoliation of snakeweed put it at a competitive disadvantage with both intact perennial bunchgrasses and regrowth crested wheatgrass, thus enhancing its mortality.

Keywords

Broom snakeweed, Guterrezia sarothrae (Pursh) Britt. & Rusby GUESAbluebunch wheatgrass, Pseudoroegneria spicata (Pursh) A. Lovecrested wheatgrass, Agropyron cristatum (L.) Gaertn.Wyoming big sagebrush, Artemisia tridentata var. wyomingensis (Beetle & A. Young) WelshBiological controlcattle grazingplant defense strategypoisonous plant
Type
Research
Information
Invasive Plant Science and Management , Volume 2 , Issue 1 , January 2009 , pp. 28 - 35
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

Briske, D.D. and Richards, J.H. 1995. Plant responses to defoliation: a physiological, morphological and demographic evaluation. Pages 635–709. in Bedunah, D.J. and Sosebee, R.E., editors. Wildland Plants: Physiological Ecology and Developmental Morphology. Denver, CO Society for Range Management.Google Scholar
Bryant, J.P., Chapin, F.S. III, and Klein, D.R. 1983. Carbon/nutrient balance of boreal plants in relation to vertebrate herbivory. Oikos 40:357–368.Google Scholar
Caldwell, M.M. 1984. Plant requirements for prudent grazing. Pages 117–152. in Gardner, B.D., editor. Developing Strategies for Rangeland Mangement. National Research Council/National Academy of Sciences. Boulder, CO Westview.Google Scholar
Caldwell, M.M., Richards, J.H., Johnson, D.A., Nowak, R.S., and Dzurec, R.S. 1981. Coping with herbivory; photosynthetic capacity and resource allocation in tow emiarid Agropyron bunchgrasses. Oecologia 50:14–24.CrossRefGoogle Scholar
Cooley, P.D., Bryant, J.P., and Chapin, F.S. III. 1985. Resource availability and plant antiherbivore defense. Science 230:895–899.CrossRefGoogle Scholar
Eissenstat, D.M. and Caldwell, M.M. 1988. Seasonal timing of root growth in favorable microsites. Ecology 69:870–873.Google Scholar
Dahl, B.E. 1995. Developmental morphology of plants. Pages 22–58. in Beduna, D.J. and Sosebee, R.E., editors. Wildland Plants: Physiological Ecology and Developmental Morphology. Denver, CO Society for Range Management.Google Scholar
Davis, M.A., Grime, J.P., and Thompson, K. 2000. Fluctuating resources in plant communities: a general theory of invisibility. J. Ecol 88:528–534.Google Scholar
Dollahite, J.W. and Anthony, W.V. 1957. Poisoning of cattle with Gutierrezia microcephala, a perennial broomweed. J. Am. Vet. Med. Assoc 130:525–530.Google Scholar
Feeny, P 1976. Plant apparency and chemical defense. Recent Adv. Phytochem 10:1–40.Google Scholar
Herms, D.A. and Mattson, W.J. 1992. The dilemma of plants to grow or defend. Q. Rev. Biol 67:283–335.Google Scholar
McDaniel, K.C. 1989. Snakeweed populations in New Mexico 1979–1989. Pages 13–24. in Huddleston, E.L. and Pieper, R.D., editors. Snakeweed Problems and Perspectives. New Mexico Agric. Exp. Stn. Bull. 751.Google Scholar
McDaniel, K.C. and Duncan, K.W. 1987. Broom snakeweed (Gutierrezia sarothrae) control with picloram and metsulfuron. Weed Sci 35:837–841.Google Scholar
McDaniel, K.C., Hart, C.R., and Carroll, D.B. 1997. Broom snakeweed control with fire on New Mexico blue grama rangeland. J. Range Manag 50:652–659.Google Scholar
McDaniel, K.C., Pieper, R.D., and Donart, G.B. 1982. Grass response following thinning of broom snakeweed. J. Range Manag 35:219–222.Google Scholar
McDaniel, K.C. and Ross, T.T. 2002. Snakeweed: poisonous properties, livestock loss, and management considerations. J. Range Manag 55:277–284.CrossRefGoogle Scholar
McDaniel, K.C. and Torell, L.A. 1987. Ecology and management of broom snakeweed. Pages 101–115. in Capinera, J.L., editor. Integrated Pest Management on Rangeland: A Shortgrass Prairie Perspective. Boulder, CO Westview.Google Scholar
McKey, D 1974. Adaptive patterns in alkaloid physiology. Am. Nat 108:305–320.Google Scholar
Mueggler, W.F. 1972. Influence of competition on the response of bluebunch wheatgrass to clipping. J. Range Manag 25:88–92.CrossRefGoogle Scholar
Olson, B.E. and Richards, J.H. 1988. Tussock regrowth after grazing: intercalary meristem and auxiliary bud activity of tillers of Agropyron desertorum . Oikos 51:374–382.Google Scholar
Platt, K.B. 1959. Plant control—some possibilities and limitations. II Vital statistics for range management. J. Range Manag 12:194–200.Google Scholar
Ralphs, M.H. and Banks, J.E. 2009. Cattle grazing broom snakeweed as a biological control: vegetation response. Range Ecol. Manag., in press.CrossRefGoogle Scholar
Ralphs, M.H. and Sanders, K.D. 2002. Population cycles of broom snakeweed in the Colorado Plateau and Snake River Plains. J. Range Manag 55:406–411.Google Scholar
Ralphs, M.H., Wiedmeier, R.D., and Banks, J.E. 2007. Decreasing forage allowance can force cattle to graze broom snakeweed (Gutierrezia sarothrae) as a biological control. Range Ecol. Manag 60:487–497.Google Scholar
Rhoades, D.F. and Cates, R.G. 1976. Toward a general theory of plant antiherbivore chemistry. Recent Adv. Phytochem 10:168–213.Google Scholar
Richards, J.H. and Caldwell, M.M. 1985. Soluble carbohydrates, concurrent photosynthesis and efficiency in regrowth following defoliation: a field study with Agropyron species. J. Appl. Ecol 22:907–920.Google Scholar
Taylor, C.A. Jr, Launchbaugh, K, Huston, E, and Straka, E. 1997. Improving the efficacy of goating for biological juniper management. Texas Agr. Exp. Sta. Tech. Rep. 97-1 5–17 to 5–22.Google Scholar
Thacker, E.T., Ralphs, M.H., Call, C.A., Benson, B, and Green, S. 2008. Using an ecological site description to evaluate broom snakeweed (Gutierrezia sarothrae) invasion in a sagebrush steppe. Range. Ecol. Manag 61:263–268.Google Scholar
Ueckert, D.N. 1979. Broom snakeweed: effect on shortgrass forage production and soil water depletion. J. Range Manag 32:216–220.Google Scholar
USFS, 1937. Range Plant Handbook. Washington, DC U.S. Government Printing Office. p. B85.Google Scholar
Vallentine, J.F. 1989. Range Development and Improvements. New York Academic Press. 514.Google Scholar