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Microsite Requirements for Downy Brome (Bromus tectorum) Infestation and Control on Sagebrush Rangelands

  • Raymond A. Evans (a1) and James A. Young (a1)

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The sagebrush (Artemisia)-grass ecosystem is an extensive and important rangeland type in the western United States. Estimates of total area of this ecosystem vary from 38 million ha (21, 22) to 109 million ha (3). Of the sagebrush-grass rangelands, 88% are degraded to the point that they are producing 50% or less of their forage potential (22). Low forage production on these rangelands has been caused by overgrazing and other past land abuses (24) resulting in severe depletion of native perennial grasses, dominance of brush, and, on millions of hectares, downy brome (Bromus tectorum L. # BROTE) dominance of the understory.

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1. Allard, R. W. 1965. Genetic systems associated with colonizing ability in predominantly self-pollinated species. Pages 5076 in Baker, H. G. and Stebbins, G. L., eds. The Genetics of Colonizing Species. Academic Press, Inc., New York.
2. Asher, J. E. and Eckert, R. E. Jr. 1973. Development, testing, and evaluation of the deep furrow drill-arm assembly for the rangeland drill. J. Range Manage. 26:377379.
3. Beetle, A. A. 1960. A study of sagebrush-section Tridentata of Artemisia . Bull. 368. Wyo. Agric. Exp. Stn., Laramie, WY. 83 pp.
4. Charley, J. L. and West, N. E. 1975. Plant-induced soil chemical patterns in some shrub-dominated semi-desert ecosystems of Utah. J. Ecol. 63:945964.
5. Christensen, M. D., Young, J. A., and Evans, R. A. 1974. Control of annual grasses and revegetation in ponderosa pine woodlands. J. Range Manage. 27:143145.
6. Eckert, R. E. Jr., Asher, J. E., Christensen, M. D., and Evans, R. A. 1974. Evaluation of the atrazine-fallow technique for weed control and seeding establishment. J. Range Manage. 27:288292.
7. Eckert, R. E. Jr. and Evans, R. A. 1967. A chemical-fallow technique for control of downy brome and establishment of perennial grasses on rangelands. J. Range Manage. 20:3541.
8. Evans, R. A., Eckert, R. E. Jr., and Kay, B. L. 1967. Wheatgrass establishment with paraquat and tillage on downy brome ranges. Weed Sci. 15:5055.
9. Evans, R. A., Holbo, H. R., Eckert, R. E. Jr., and Young, J. A. 1970. Functional environment of downy brome communities in relation to weed control and revegetation. Weed Sci. 18:154162.
10. Evans, R. A. and Young, J. A. 1970. Plant litter and establishment of alien annual weed species in rangeland communities. Weed Sci. 18:697703.
11. Evans, R. A. and Young, J. A. 1972. Microsite requirements for establishment of annual rangeland weeds. Weed Sci. 20:350356.
12. Evans, R. A. and Young, J. A. 1975. Enhancing germination of dormant seeds of downy brome. Weed Sci. 23:354357.
13. Evans, R. A. and Young, J. A. 1977. Weed control-revegetation systems for big sagebrush-downy brome rangelands. J. Range Manage. 30:331336.
14. Evans, R. A. and Young, J. A. 1978. Effectiveness of rehabilitation practices following wildfire in a degraded big sagebrush-downy brome community. J. Range Manage. 31:185188.
15. Evans, R. A., Young, J. A., and Eckert, R. E. Jr. 1979. Saga of downy brome and mustard seeds or how atrazine-fallow works on rangelands. Weeds Today 10:1415.
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21. U.S. Dep. Agric., For. Serv. 1936. The western range. Senate Doc. 199 Washington, DC. 620 pp.
22. U.S. Dep. Agric., For. Serv. 1972. The nations range resources. Res. Rep. 19. Washington, DC. 147 pp.
23. Wallace, A., Rhodes, W. A., and Frolich, E. F. 1968. Germination behavior of Salsola as influenced by temperature, moisture, depth of planting and gamma radiation. Agron. J. 60:7678.
24. Young, J. A., Eckert, R. E. Jr., and Evans, R. A. 1979. Historical perspectives regarding the sagebrush ecosystem. Pages 113 in The Sagebrush Ecosystem: A Symposium. Utah State Univ., Logan, UT.
25. Young, J. A. and Evans, R. A. 1975. Germinability of seed reserves in a big sagebrush community. Weed Sci. 23:358364.
26. Young, J. A. and Evans, R. A. 1978. Population dynamics after wildfires in sagebrush grasslands. J. Range Manage. 31:283289.
27. Young, J. A. and Evans, R. A. 1978. Karbutilate for weed control on sagebrush rangelands. Weed Sci. 26:2732.
28. Young, J. A., Evans, R. A., and Eckert, R. E. Jr. 1969. Population dynamics of downy brome. Weed Sci. 17:2026.
29. Young, J. A., Evans, R. A., Gifford, R. O., and Eckert, R. E. Jr. 1970. Germination characteristics of three species of Cruciferae. Weed Sci. 18:4148.
30. Young, J. A., Evans, R. A., and Major, J. 1972. Alien plants in the Great Basin. J. Range Manage. 25:194201.
31. Young, J. A., Evans, R. A., and Weaver, R. R. 1976. Estimating potential downy brome competition after wildfires. J. Range Manage. 29:322325.
32. Young, J. A. and McKenzie, D. 1982. Rangeland drill. Rangelands. 4:108113.

Microsite Requirements for Downy Brome (Bromus tectorum) Infestation and Control on Sagebrush Rangelands

  • Raymond A. Evans (a1) and James A. Young (a1)

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