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Is Pyrenophora semeniperda the Cause of Downy Brome (Bromus tectorum) Die-offs?

Published online by Cambridge University Press:  20 January 2017

Owen W. Baughman  and
Susan E. Meyer
Owen W. Baughman*
Affiliation:
College of Natural Resources, University of Idaho, 975 West 6th Street, Moscow, ID 83844
Susan E. Meyer
Affiliation:
U.S. Forest Service Rocky Mountain Research Station, Shrub Sciences Laboratory, 735 North 500 East, Provo, UT 84606
*
Corresponding Author's Email: [email protected]
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Abstract

Downy brome (cheatgrass) is a highly successful, exotic, winter annual invader in semi-arid western North America, forming near-monocultures across many landscapes. A frequent but poorly understood phenomenon in these heavily invaded areas is periodic ‘die-off’ or complete stand failure. The fungal pathogen Pyrenophora semeniperda is abundant in cheatgrass seed banks and causes high mortality. To determine whether this pathogen could be responsible for stand failure, we quantified late spring seed banks in die-off areas and adjacent cheatgrass stands at nine sites. Seed bank analysis showed that this pathogen was not a die-off causal agent at those sites. We determined that seed bank sampling and litter data could be used to estimate time since die-off. Seed bank patterns in our recent die-offs indicated that the die-off causal agent does not significantly impact seeds in the persistent seed bank.

Keywords

Downy brome, Bromus tectorum L.black fingers of death, Pyrenophora semeniperda (Brittleb. & D.B. Adam) ShoemakerCheatgrassGreat Basinseed bankseed pathogenstand failure
Type
Research
Information
Invasive Plant Science and Management , Volume 6 , Issue 1 , March 2013 , pp. 105 - 111
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Department of Natural Resources and Environmental Science, University of Nevada, 1664 N. Virginia Street, MS0186, Reno, NV 89557

References

Literature Cited

Baughman, O. W. and Meyer, S. E. 2009. Investigating Bromus tectorum die-offs in Great Basin cold deserts: Quantification of the pathogen Pyrenophora semeniperda . Abstract 263. Bot. Soc. Am. Annual Meeting, Snowbird UT, July 2–29, 2009.Google Scholar
Baughman, O. W., Meyer, S. E., and Beckstead, J. 2012. Exploring the causes and effects of cheatgrass die-off in the Great Basin, USA. Abstract PS53-144. Ecol. Soc. Am. 97th Annual Meeting, Portland OR, August 5–10, 2012.Google Scholar
Beckstead, J., Meyer, S. E., Connolly, B. M., Huck, M. B., and Street, L. E. 2010. Cheatgrass facilitates spillover of a seed bank pathogen onto native grass species. J. Ecology 98 :168–177.Google Scholar
Beckstead, J., Meyer, S. E., Molder, C. J., and Smith, C. 2007. A race for survival: Can Bromus tectorum seeds escape Pyrenophora semeniperda-caused mortality by germinating quickly? Ann. Bot. 99 :907–914.Google Scholar
Bauer, M., Meyer, S. E., and Allen, P. S. 1998. A simulation model to predict seed dormancy loss in the field for Bromus tectorum L. J. Exp. Bot. 49 :1235–1244.Google Scholar
Brooks, M. L., D'Antonio, C. M., Richardson, D. M., Grace, J. B., Keeley, J. E., DiTomaso, J. M., Hobbs, R. J., Pellant, M., and Pyke, D. 2004. Effects of invasive alien plants on fire regimes. BioScience 54 :677–688.Google Scholar
Campbell, M. A. and Medd, R. W. 2003. Leaf, floret and seed infection of wheat by Pyrenophora semeniperda . Plant Path. 52 :437–447.Google Scholar
Knapp, P. A. 1996. Cheatgrass (Bromus tectorum L.) dominance in the Great Basin desert—history, persistence, and influences to human activities. Global Environ. Chang. 6 :37–52.Google Scholar
Littell, R. C., Milliken, G. A., Stroup, W. W., and Wolfinger, R. D. 1996. SAS System for Mixed Models. SAS Institute, Cary NC. 633 p.Google Scholar
Medd, R. W., Murray, G. M., and Pickering, D. I. 2003. Review of the epidemiology and economic importance of Pyrenophora semeniperda . Australas. Plant Path. 32 :539–550.Google Scholar
Mack, R. N. 1981. Invasion of Bromus tectorum L. into western North America: an ecological chronicle. Agro-Ecosystems 7 :145–165.Google Scholar
Meyer, S. E. 2012. Are cheatgrass die-offs in the Great Basin an opportunity for long-term control? Abstract 116. Soc. Range Manag. 65th Annual Meeting, Spokane WA, January 29–February 3, 2012.Google Scholar
Meyer, S. E., Quinney, D., Nelson, D. L., and Weaver, J. 2007. Impact of the pathogen Pyrenophora semeniperda on Bromus tectorum seed bank dynamics in North American cold deserts. Weed Res. 47 :54–62.Google Scholar
Meyer, S. E., Stewart, T. E., and Clement, S. 2010. The quick and the deadly: growth versus virulence in a seed bank pathogen. New Phytol. 187 :209–216.Google Scholar
Morgan, T., Blank, R., and Clements, C. 2011. Cheatgrass dead zones in northern Nevada. Abstract 94. Soc. Range Manag. 64th Annual Meeting, Billings MT, February 6–11, 2011.Google Scholar
Salo, L. F. and Zielinski, M. 2004. Cheatgrass dieoffs: of drought, cutworms, and bears? Poster. Soc. Range Manag. 57th Annual Meeting, Janurary 24–30, 2004. Salt Lake City, UT.Google Scholar
Smith, D. C., Meyer, S. E., and Anderson, V. J. 2008. Factors affecting Bromus tectorum seed bank carryover in western Utah. Rangeland Ecol. & Manag. 61 :430–436.Google Scholar
Stewart, G. and Hull, A. C. 1949. Cheatgrass (Bromus tectorum L.) – an ecologic intruder in southern Idaho. Ecol. 30 :58–74.Google Scholar