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Invasive weeds in rangelands: Species, impacts, and management

Published online by Cambridge University Press:  20 January 2017

Joseph M. DiTomaso
Joseph M. DiTomaso*
Affiliation:
Weed Science Program, Department of Vegetable Crops, University of California, Davis, CA 95616; ditomaso@vegmail.ucdavis.edu
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Abstract

Rangeland and pastures comprise about 42% of the total land area of the United States. About three-quarters of all domestic livestock depend upon grazing lands for survival. Many ranges have had domestic stock grazing for more than 100 years and, as a result, the plant composition has changed greatly from the original ecosystems. Western rangelands previously dominated by perennial bunchgrasses have been converted, primarily through overgrazing, to annual grasslands that are susceptible to invasion by introduced dicots. Today there are more than 300 rangeland weeds in the United States. Some of the most problematic include Bromus tectorum, Euphorbia esula, Centaurea solstitialis, C. diffusa, C. maculosa, and a number of other Centaurea species. In total, weeds in rangeland cause an estimated loss of $2 billion annually in the United States, which is more than all other pests combined. They impact the livestock industry by lowering yield and quality of forage, interfering with grazing, poisoning animals, increasing costs of managing and producing livestock, and reducing land value. They also impact wildlife habitat and forage, deplete soil and water resources, and reduce plant and animal diversity. Numerous mechanical and cultural control options have been developed to manage noxious rangeland weeds, including mowing, prescribed burning, timely grazing, and perennial grass reseeding or interseeding. In addition, several herbicides are registered for use on rangelands and most biological control programs focus on noxious rangeland weed control. Successful management of noxious weeds on rangeland will require the development of a long-term strategic plan incorporating prevention programs, education materials and activities, and economical and sustainable multi-year integrated approaches that improve degraded rangeland communities, enhance the utility of the ecosystem, and prevent reinvasion or encroachment by other noxious weed species.

Keywords

Bromus tectorum L. BROTE, downy bromeCentaurea diffusa Lam. CENDI, diffuse knapweedCentaurea maculosa Lam. CENMA, spotted knapweedCentaurea solstitialis L. CENSO, yellow starthistleEuphorbia esula L. EPHES, leafy spurgeGrasslandIPMnoxious weedpreventionBROTECENDICENMACENSOEPHES
Type
Research Article
Information
Weed Science , Volume 48 , Issue 2 , April 2000 , pp. 255 - 265
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

Balciunas, J. and Villegas, B. 1999. Two new seed head flies attack yellow starthistle. California Ag. 53 (2): 8–11.CrossRefGoogle Scholar
Belcher, J. W. and Wilson, S. D. 1989. Leafy spurge and species composition of a mixed-grass prairie. J. Range Manage. 42:172–175.CrossRefGoogle Scholar
Benefield, C. B., DiTomaso, J. M., Kyser, G. B., Orloff, S. B., Churches, K. R., Marcum, D. B., and Nader, G. A. 1999. Success of mowing to control yellow starthistle depends on timing and plant's branching form. California Ag. 53(2):17–21.Google Scholar
Biesboer, D. D., Darveaux, B., and Koukkari, W. L. 1994. Controlling leafy spurge and Canada thistle by competitive species. St. Paul, MN: Minnesota Dept. Transportion, Office of Res. Admin. Publ. No. 78. 1 p.Google Scholar
Billings, W. D. 1994. Ecological affects of cheatgrass and resultant fire on ecosystems in the western Great Basin. Pages 22–30 In Monsen, S. B. and Kitchen, S. G., eds. Proceedings of Ecology and Management of Annual Rangelands. Ogden, UT: USDA Forest Service Intermountain Research Station Gen. Tech. Rep. INT-GTR-313.Google Scholar
Blossey, B., Schroeder, D., Hight, S. D., and Malecki, R. A. 1994. Host specificity and environmental affect of the weevil Hylobius transversovittatus, a biological control agent of purple loosestrife (Lythrum salicaria). Weed Sci. 42:128–133.CrossRefGoogle Scholar
Borman, M. M., Krueger, W. C., and Johnson, D. E. 1991. Effects of established perennial grasses on yields of associated annual weeds. J. Range Manage. 44:318–326.CrossRefGoogle Scholar
Bottoms, R. M. and Whitson, T. D. 1998. A systems approach for the management of Russian knapweed (Centaurea repens). Weed Technol. 12:363–366.CrossRefGoogle Scholar
Bovey, R. W. 1987. Weed control problems, approaches, and opportunities in rangeland. Rev. Weed Sci. 3:57–91.Google Scholar
Bowns, J. E. and Bagley, C. F. 1986. Vegetation responses to long-term sheep grazing on mountain ranges. J. Range Manage. 39:431–434.CrossRefGoogle Scholar
Bunting, S. C. 1994. Effects of fire on juniper woodland ecosystems in the Great Basin. Pages 53–55 In Monsen, S. B. and Kitchen, S. G., eds. Proceedings of Ecology and Management of Annual Rangelands. Ogden, UT: USDA Forest Service Intermountain Research Station Gen. Tech. Rep. INT-GTR-313.Google Scholar
Bussan, A. J. and Dyer, W. E. 1999. Herbicides and rangeland. Pages 116–132 In Sheley, R. L. and Petroff, J. K., eds. Biology and Management of Noxious Rangeland Weeds. Corvallis, OR: Oregon State University Press.Google Scholar
Callihan, R. H. and Evans, J. O. 1991. Weed dynamics on rangeland. Pages 55–61 In James, L. F., Evans, J. O., Ralphs, M. H., and Child, R. D., eds. Noxious Range Weeds. San Francisco: Westview Press.Google Scholar
Coombs, E. M., Bedell, T. E., and McEvoy, P. B. 1991. Tansy ragwort (Senecio jacobaea): importance, distribution, and control in Oregon. Pages 419–437 In James, L. F., Evans, J. O., Ralphs, M. H., and Child, R. D., eds. Noxious Range Weeds. San Francisco: Westview Press.Google Scholar
Cross, B. T. and Wiedemann, H. T. 1985. Grubbing for control of black-brush acacia (Acacia rigidula) invading rootplowed rangeland. Weed Sci. 33:263–266.Google Scholar
D’Antonio, C. M. and Vitousek, P. M. 1992. Biological invasions by exotic grasses, the grass/fire cycle, and global change. Annu. Rev. Ecol. Syst. 23:63–87.CrossRefGoogle Scholar
DeLoach, C. J. 1991. Past successes and current prospects in biological control of weeds in the United States and Canada. Natural Areas J. 11:129–142.Google Scholar
DiTomaso, J. M. 2000. Irrigated pastures. In Colbert, F., ed. Principles of Weed Control in California, 3rd ed. Fresno, CA: Thomson Publishing. In press.Google Scholar
DiTomaso, J. M., Kyser, G. B., and Hastings, M. S. 1999a. Prescribed burning for control of yellow starthistle (Centaurea solstitialis) and enhanced native plant diversity. Weed Sci. 47:233–242.Google Scholar
DiTomaso, J. M., Kyser, G. B., Orloff, S. B., Enloe, S. F., and Nader, G. A. 1999b. New growth regulator herbicide provides excellent control of yellow starthistle. California Ag. 53 (2): 12–16.Google Scholar
Drake, K. R. and Whitson, T. D. 1989. Control of hoary cress (Cardaria draba (L.) Desv.) on pastures. Page 40 In Proceedings of the Western Society of Weed Science. Vol. 42. Western Society of Weed Science.Google Scholar
Enloe, S. and DiTomaso, J. 1999. Integrated management of yellow starthistle on California rangeland. Pages 24–27 In Proceedings of the California Weed Science Society. Vol. 51. California Weed Science Society.Google Scholar
Ferrell, M. A., Whitson, T. D., Koch, D. W., and Gade, A. E. 1993. Integrated control of leafy spurge (Euphorbia esula) with Bozoisky Russian wildrye (Psathyrostachys juncea) and Luna pubescent wheatgrass (Agropyron intermedium var. trichophorum). Pages 36–38 In Proceedings of the Western Society of Weed Science. Vol. 46. Western Society of Weed Science.Google Scholar
Ferrell, M. A., Whitson, T. D., Koch, D. W., and Gade, A. E. 1998. Leafy spurge (Euphorbia esula) control with several grass species. Weed Technol. 12:374–380.CrossRefGoogle Scholar
Forcella, F. and Harvey, S. J. 1983. Eurasian weed infestation in western Montana in relation to vegetation and disturbance. Madroño 30:102–109.Google Scholar
Frandsen, E. and Boe, D. 1991. Economics of noxious weeds and poisonous plants. Pages 442–458 In James, L. F., Evans, J. O., Ralphs, M. H., and Child, R. D., eds. Noxious Range Weeds. San Francisco: Westview Press.Google Scholar
Goeden, R. D. 1993. Arthropods for suppression of terrestrial weeds. Pages 231–237 In Lumsden, R. D. and Vaughn, J. L., eds. Pest Management: Biologically Based Technologies. Washington, D.C.: American Chemical Society.Google Scholar
George, M. R. 1992. Ecology and management of medusahead. Davis, CA: University of California Range Sci. Rep. 32:1–3.Google Scholar
Gerlach, J. D. and Rice, K. 1996. Centaurea solstitialis threatens California's ecosystems. Bull. Ecol. Soc. Amer. 77:160.Google Scholar
Hansen, R. 1993. Effects of Aphthona flea beetles and sheep grazing in leafy spurge stands. Pages 47–48 In Proceedings of 1993 Leafy Spurge Symposium. Silvercreek, CO.Google Scholar
Harrington, K. C. and Lanini, W. T. 2000. Invasive plants of California's wildlands. In Bossard, C., Randall, J. M., and Hoshovsky, M., eds. Wildland Weeds of California. Berkeley, CA: UC Press. In press.Google Scholar
Hatch, D. A., Bartolome, J. W., and Hillyard, D. S. 1991. Testing a management strategy for restoration of California's native grasslands. Pages 343–349 In Proceedings of the Symposium on Natural Areas and Yosemite: Prospects for the Future. Denver, CO: U.S. National Park Service.Google Scholar
Hirsch, S. A. and Leitch, J. A. 1996. The affect of knapweed on Montana's economy. Ag. Econ. Rep. No. 355. 43 p.Google Scholar
Horton, W. H. 1991. Medusahead: Importance, distribution, and control. Pages 394–398 In James, L. F., Evans, J. O., Ralphs, M. H., and Child, R. D., eds. Noxious Range Weeds. San Francisco: Westview Press.Google Scholar
Jacobs, J. S., Carpinelli, M. F., and Sheley, R. L. 1999. Revegetating noxious weed-infested rangeland. Pages 133–141 In Sheley, R. L. and Petroff, J. K., eds. Biology and Management of Noxious Rangeland Weeds. Corvallis, OR: Oregon State University Press.Google Scholar
James, D. 1992. Some principles and practices of desert revegetation seeding. Arid Lands Newsletter 32:22–27.Google Scholar
Johnson, D. E. 1999. Surveying, mapping, and monitoring noxious weeds on rangelands. Pages 19–35 In Sheley, R. L. and Petroff, J. K., eds. Biology and Management of Noxious Rangeland Weeds. Corvallis, OR: Oregon State University Press.Google Scholar
Julien, M. H. 1989. Biological control of weeds worldwide: trend, rates of success and the future. Biocontrol News Info. 10:299–306.Google Scholar
Julien, M. H., ed. 1992. Biological Control of Weeds: A World Catalogue of Agents and Their Target Weeds. 3rd ed. Wallingford, U.K.: CAB International. 186 p.Google Scholar
Kennett, G. A., Lacey, J. R., Butt, C. A., Olson-Rutz, K. M., and Haferkamp, M. R. 1992. Effects of defoliation, shading and competition on spotted knapweed and bluebunch wheatgrass. J. Range Manage. 45:363–369.Google Scholar
Kingsbury, J. M. 1964. Poisonous Plants of the United States and Canada. Englewood Cliffs, NJ: Prentice-Hall, pp. 296–397.Google Scholar
Kirby, D. R., Hanson, T. P., and Hull Sieg, C. 1997. Diets of Angora goats grazing leafy spurge (Euphorbia esula)-infested rangeland. Weed Technol. 11:734–738.Google Scholar
Lacey, C. A., Lacey, J. R., Fay, P. K., Story, J. M., and Zamora, D. L. 1995. Controlling knapweed in Montana rangeland. Bozeman, MT: Montana State University Cooperative Extension Service Circular 311. 17 p.Google Scholar
Lacey, J. R., Marlow, C. B., and Lane, J. R. 1989. Influence of spotted knapweed (Centaurea maculosa) on surface runoff and sediment yield. Weed Technol. 3:627–631.Google Scholar
Lacey, J.R., Wallender, R., and Olson-Rutz, K. 1992. Recovery, germinability, and viability of leafy spurge (Euphorbia esula) seeds ingested by sheep and goats. Weed Technol. 6:559–602.Google Scholar
Landgraf, B. K., Fay, P. L., and Havstad, K. M. 1984. Utilization of leafy spurge (Euphorbia esula) by sheep. Weed Sci. 32:348–352.Google Scholar
Larson, L. L. and McInnis, M. L. 1989. Affect of grass seedlings on establishment and density of diffuse knapweed and yellow starthistle. Northwest Sci. 63:162–166.Google Scholar
Lee, G. A. 1986. Integrated control of rush skeletonweed (Chondrilla juncea) in the western U.S. Weed Sci. 34:2–6.Google Scholar
Leitch, J.A., Leistritz, F. L., and Bangsund, D. A. 1996. Economic effect of leafy spurge in the Upper Great Plains: Methods, models, and results. Impact Assessment 14:419–433.Google Scholar
Lesica, P. and Shelly, J. S. 1996. Competitive effects of Centaurea maculosa on the population dynamics of Arabis fecunda . Bull. Torrey Bot. Club. 123:111–121.CrossRefGoogle Scholar
Lym, R. G. 1998. The biology and integrated management of leafy spurge (Euphorbia esula) on North Dakota rangeland. Weed Technol. 12:367–373.CrossRefGoogle Scholar
Lym, R. G., Carlson, R. B., Messersmith, C. G., and Mundal, D. A. 1996. Integration of herbicides with flea beetles, Aphthona nigriscutis, for leafy spurge control. Pages 480–481 In Proceedings of the IX International Symposium on Biological Control of Weeds. Stellenbosch, South Africa.Google Scholar
Lym, R. G. and Kirby, D. R. 1987. Cattle foraging behavior in leafy spurge (Euphorbia esula)-infested rangeland. Weed Technol. 1:314–318.Google Scholar
Lym, R. G. and Messersmith, C. G. 1993. Fall cultivation and fertilization to reduce winterhardiness of leafy spurge (Euphorbia esula). Weed Sci. 41:441–446.CrossRefGoogle Scholar
Lym, R. G. and Messersmith, C. G. 1994. Leafy spurge (Euphorbia esula) control, forage production, and economic return with fall-applied herbicides. Weed Technol. 8:824–829.CrossRefGoogle Scholar
Lym, R. G., Sedivec, K. K., and Kirby, D. R. 1997. Leafy spurge control with Angora goats and herbicides. J. Range Manage. 50:123–128.CrossRefGoogle Scholar
Lym, R. G. and Tober, D. A. 1997. Competitive grasses for leafy spurge (Euphorbia esula) reduction. Weed Technol. 11:787–792.Google Scholar
Masters, R. A. and Nissen, S. J. 1998. Revegetating leafy spurge (Euphorbia esula)-infested rangeland with native tallgrasses. Weed Technol. 12:381–390.Google Scholar
Mayeux, H. S. and Hamilton, W. T. 1988. Response of false broomweed and associated herbaceous species to fire. J. Range Manage. 41:2–6.CrossRefGoogle Scholar
Mayeux, H. S., Johnson, H. B., and Polley, H. W. 1991. Pages 62–74 In James, L. F., Evans, J. O., Ralphs, M. H., and Child, R. D., eds. Noxious Range Weeds. San Francisco: Westview Press.Google Scholar
McEvoy, P. B., Cox, C. S., and Coombs, E. M. 1991. Successful biological control of ragwort. Ecol. App. 1:430–432.Google Scholar
McHenry, W. B. and Murphy, A. H. 1985. Weed management of California rangeland. Pages 413–423 In Kurtz, E. A. and Colbert, F. O., eds. Principles of Weed Control in California. Fresno, CA: Thomson Publishing.Google Scholar
Morrow, L. A. and Stahlman, P. W. 1984. The history and distribution of downy brome (Bromus tectorum) in North America. Weed Sci. 32 (suppl.): 2–6.CrossRefGoogle Scholar
Murphy, A. H. 1986. Significance of rangeland weeds for livestock management strategies. Pages 114–116 in Proceedings of the California Weed Conference.Google Scholar
Nelson, J. A., Lym, R. G., and Messersmith, C. G. 1998. Integration of herbicides with the biological agent Aphthona nigriscutis for leafy spurge control. Page 132 In Proceedings of the Western Society of Weed Science. Vol. 51. Western Society of Weed Science.Google Scholar
Olson, B. E. 1999a. Impacts of noxious weeds on ecologic and economic systems. Pages 4–18 In Sheley, R. L. and Petroff, J. K., eds. Biology and Management of Noxious Rangeland Weeds. Corvallis, OR: Oregon State University Press.Google Scholar
Olson, B. E. 1999b. Grazing and weeds. Pages 85–96 In Sheley, R. L. and Petroff, J. K., eds. Biology and Management of Noxious Rangeland Weeds. Corvallis, OR: Oregon State University Press.Google Scholar
Panter, K. E. 1991. Neurotoxicity of the knapweeds (Centaurea spp.) in horses. Pages 316–324 In James, L. F., Evans, J. O., Ralphs, M. H., and Child, R. D., eds. Noxious Range Weeds. San Francisco: Westview Press.Google Scholar
Parmenter, R. R. and MacMahon, J. A. 1983. Factors determining the abundance and distribution of rodents in a shrub-steppe ecosystem: the role of shrubs. Oecologia 59:145–156.Google Scholar
Quimby, P. C. Jr., Bruckart, W. L., DeLoach, C. J., Knutson, L., and Ralphs, M. H. 1991. Biological control of rangeland weeds. Pages 84–102 In James, L. F., Evans, J. O., Ralphs, M. H., and Child, R. D., eds. Noxious Range Weeds. San Francisco: Westview Press.Google Scholar
Rasmussen, G. A. 1991. Oakbrush: classification, ecology, and management. Pages 352–363 In James, L. F., Evans, J. O., Ralphs, M. H., and Child, R. D., eds. Noxious Range Weeds. San Francisco: Westview Press.Google Scholar
Renz, M. and DiTomaso, J. 1999. Biology and control of perennial pepperweed. Pages 13–16 In Proceedings of the California Weed Science Society. Vol. 51. California Weed Science Society.Google Scholar
Rikard, W. H. and Cline, J. F. 1980. Cheatgrass communities: effects of plowing on species composition and productivity. Northwest Sci. 54:216–221.Google Scholar
Roché, B. F. Jr., Piper, G. L., and Talbott, C. J. 1986. Knapweeds in Washington. Pullman, WA: USDA/Washington State Cooperative Extension Bull. EB1393. 41 p.Google Scholar
Roché, B. F. Jr. and Roché, C. T. 1991. Identification, introduction, distribution, ecology, and economics of Centaurea species. Pages 274–291 In James, L. F., Evans, J. O., Ralphs, M. H., and Child, R. D., eds. Noxious Range Weeds, San Francisco: Westview Press.Google Scholar
Roché, B. F. Jr., Roché, C. T., and Chapman, R. C. 1994. Impacts of grassland habitat on yellow starthistle (Centaurea solstitialis L.) invasion. Northwest Sci. 68:86–96.Google Scholar
Roché, C. T. and Roché, B. F. Jr. 1989. Introductory notes on squarrose knapweed (Centaurea virgata Lam. ssp. squarrosa Gugl.) Northwest Sci. 63:246–252.Google Scholar
Rosentreter, R. 1994. Displacement of rare plants by exotic grasses. Pages 170–175 In Monsen, S. B. and Kitchen, S. G., eds. Proceedings of Ecology and Management of Annual Rangelands. Ogden, UT: USDA Forest Service Intermountain Research Station Gen. Tech. Rep. INT-GTR-313.Google Scholar
Selleck, G. W., Coupland, R. T., and Frankton, C. 1962. Leafy spurge in Saskatchewan. Ecol. Monogr. 32:1–29.Google Scholar
Senft, D. 1983. Fire freshens rangeland. Agric. Res. 32:10–11.Google Scholar
Sheley, R. L., Jacobs, J. S., and Carpinelli, M. F. 1998. Distribution, biology, and management of diffuse knapweed (Centaurea diffusa) and spotted knapweed (Centaurea maculosa). Weed Technol. 12:353–362.CrossRefGoogle Scholar
Sheley, R. L., Kedzie-Webb, S., and Maxwell, B. D. 1999a. Integrated weed management on rangeland. Pages 57–68 In Sheley, R. L. and Petroff, J. K., eds. Biology and Management of Noxious Rangeland Weeds. Corvallis, OR: Oregon State University Press.Google Scholar
Sheley, R. L., Manoukian, M., and Marks, G. 1999b. Preventing noxious weed invasion. Pages 69–72 In Sheley, R. L. and Petroff, J. K., eds. Biology and Management of Noxious Rangeland Weeds. Corvallis, OR: Oregon State University Press.Google Scholar
Thompson, M. J. 1996. Winter foraging response of elk to spotted knapweed removal. Northwest Sci. 70:10–19.Google Scholar
Thomsen, C. D., Williams, W. A., Vayssieres, M., Bell, F. L., and George, M. R. 1993. Controlled grazing on annual grassland decreases yellow starthistle. California Ag. 47 (6): 36–40.CrossRefGoogle Scholar
Trammell, M. A. and Butler, J. L. 1995. Effects of exotic plants on native ungulate use of habitat. J. Wildl. Manage. 59:808–816.CrossRefGoogle Scholar
Tyser, R. W. and Key, C. H. 1988. Spotted knapweed in natural area fescue grassland: an ecological assessment. Northwest Sci. 62:151–160.Google Scholar
Ueckert, D. N., Petersen, J. L., Potter, R. L., Whipple, J. D., and Wagner, M. W. 1988. Managing pricklypear with herbicides and fire. Pages 10–15 In Texas Agricultural Experiment Station Report No. 4570.Google Scholar
Volesky, J. D., Currie, P. O., and Lacey, J. R. 1990. Comparison of two drills for interseeding rangeland. Montana Agric. Res. 7:18–22.Google Scholar
Walker, J. S, Kronberg, S. L., Al-Rowaily, S. L., and West, N. E. 1994. Comparison of sheep and goat preferences for leafy spurge. J. Range Manage. 47:429–434.Google Scholar
Walker, J.W. 1994. Multispecies grazing: the ecological advantage. Pages 52–64 In Sheep Res. J. Special Issue.Google Scholar
Wallace, N. M., Leitch, J. A., and Leistritz, F. L. 1992. Economic impact of leafy spurge on North Dakota wildland. North Dakota Farm Res. 49:9–13.Google Scholar
Wallander, R. T. and Olson, B. E. 1995. Enhancing the competitiveness of other species with leafy spurge. In Proceedings of the Leafy Spurge Symposium. Fargo, ND: North Dakota State University.Google Scholar
Waterhouse, D. M. and Mahoney, J. E. 1983. Effect of pre-fallowing application of glyphosate on hoary cress (Cardaria draba (L.) Desv.). Australian Weeds 2:141–143.Google Scholar
Whisenant, S. G. 1990. Changing fire frequencies on Idaho's Snake River Plains: ecological and management implications. Pages 4–10 In McArthur, E. D., Romney, E. M., Smith, S. D., and Tueller, P. T., eds. Proceedings of the Symposium on Cheatgrass Invasion, Shrub Die-off, and Other Aspects of Shrub Biology and Management. Ogden, UT: USDA Forest Service Internountain Research Station Gen. Tech. Rept. INT-GTR-313.Google Scholar
Whitson, T. D. 1998. Integrated pest management systems for weed control. Page 43 In Proceedings of the Western Society of Weed Science. Vol. 51. Western Society of Weed Science.Google Scholar
Whitson, T. D. and Koch, D. W. 1998. Control of downy brome (Bromus tectorum) with herbicides and perennial grass competition. Weed Technol. 12:391–396.Google Scholar
Whitson, T. D., Mooney, A., and Griswold, M. 1989. Control of hoary cress (Cardaria draba) with various herbicides. Page 39 In Proceedings of the Western Society of Weed Science. Vol. 42. Western Society of Weed Science.Google Scholar
Wilson, L. M. and McCaffrey, J. P. 1999. Biological control of noxious rangeland weeds. Pages 97–116 In Sheley, R. L. and Petroff, J. K., eds. Biology and Management of Noxious Rangeland Weeds. Corvallis, OR: Oregon State University Press.Google Scholar
Young, J. A. and Evans, R. A. 1978. Population dynamics after wildfires in sagebrush grasslands. J. Range Manage. 31:283–289.Google Scholar
Young, J. A. and Longland, W. S. 1996. Affect of alien plants on Grant Basin rangeland. Weed Technol. 10:384–391.Google Scholar
Young, J. A., Palmquist, D. E., and Blank, R. R. 1998. The ecology and control of perennial pepperweed (Lepidium latifolium L.). Weed Technol. 12:402–405.Google Scholar
Zamora, D. L. and Thill, D. C. 1999. Early detection and eradication of new weed infestations. Pages 73–84 In Sheley, R. L. and Petroff, J. K., eds. Biology and Management of Noxious Rangeland Weeds. Corvallis, OR: Oregon State University Press.Google Scholar