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Herbicides and Mowing to Control Barb Goatgrass (Aegilops triuncialis) and Restore Native Plants in Serpentine Grasslands

Published online by Cambridge University Press:  20 January 2017

Paul A. Aigner  and
Rhett J. Woerly
Paul A. Aigner*
Affiliation:
University of California, Davis, Donald and Sylvia McLaughlin Reserve, 26775 Morgan Valley Road, Lower Lake, CA 95457 Department of Environmental Science and Policy, University of California, Davis, CA 95616
Rhett J. Woerly
Affiliation:
Steward, University of California, Davis, Donald and Sylvia McLaughlin Reserve, 26775 Morgan Valley Road, Lower Lake, CA 95457
*
Corresponding author's E-mail: [email protected]
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Abstract

Serpentine grasslands are relatively free of the invasive species that typify other California grasslands, but recently are threatened by the spread of barb goatgrass, a Eurasian annual that is unique in its tolerance of serpentine soils. We evaluated two graminicides (clethodim and fluazifop), one broad-spectrum herbicide (glyphosate), mowing, and hand pulling for their effectiveness in controlling barb goatgrass and for restoring native species cover and diversity. We also evaluated application timing for the graminicides: before goatgrass flowering (early season), at flower initiation (midseason), and at early seed development (late season). Glyphosate was applied at early seed development. The 10 treatment combinations were applied to 10 blocks of 4-m2 (43-ft2) experimental plots in an inner Coast Range serpentine grassland with high cover of barb goatgrass but few other nonnative species. After 2 yr of treatment, all treatments except glyphosate reduced goatgrass frequency. Hand pulling, fluazifop, and mowing were most effective at controlling goatgrass, reducing frequency by 60, 51, and 48%, respectively (compared to a 30% increase on control plots). Midseason applications of clethodim and fluazifop were more effective than those applied early or late. Hand pulling, fluazifop, and clethodim increased native forb frequency by 31, 46, and 74%, respectively, with the benefit of the graminicides decreasing with later applications. Native grasses were at least partially resistant to the graminicides. Cover of one sided blue grass (Poa secunda), the most widespread native grass, might have been reduced slightly by early-season applications but was increased by late-season applications. Cover of soft brome (Bromus hordeaceus), the only other widespread nonnative species in the study, was reduced by early-season applications of the graminicides. Clethodim and fluazifop show great potential to selectively remove barb goatgrass and other nonnative annual grasses in grasslands that are otherwise dominated by native grasses and forbs. Mowing is a less selective, but viable alternative.

Keywords

Clethodimfluazifopglyphosatebarb goatgrass, Aegilops triuncialis L.Sandburg bluegrass, Poa secunda J. Presl.Holocarpha virgatainvasive plantNavarretia jepsoniiPoa secunda
Type
Research Article
Information
Invasive Plant Science and Management , Volume 4 , Issue 4 , December 2011 , pp. 448 - 457
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

Blake, R. J., Woodcock, B. A., Westbury, D. B., Sutton, P., and Potts, S. G. 2011. New tools to boost butterfly habitat quality in existing grass buffer strips. J. Insect Conserv. 15:221–232.Google Scholar
Brewster, B. D. and Spinney, R. L. 1989. Control of seedling grasses with postemergence grass herbicides. Weed Technol. 3:39–43.Google Scholar
Cione, N. K., Padgett, P. E., and Allen, E. B. 2002. Restoration of a native shrubland impacted by exotic grasses, frequent fire, and nitrogen deposition in southern California. Restor. Ecol. 10:376–384.Google Scholar
[CNPS] California Native Plant Society. 2001. Inventory of Rare and Endangered Plants of California. 6 ed. Sacramento, CA California Native Plant Society. 388 p.Google Scholar
DiTomaso, J. M., Heise, K. L., Kyser, G. B., Merenlender, A. M., and Keiffer, R. J. 2001. Carefully timed burning can control barb goatgrass. Calif. Agric. 55:47–53.Google Scholar
Dyer, A. R. 2004. Maternal and sibling factors induce dormancy in dimorphic seed pairs of Aegilops triuncialis . Plant Ecol. 172:211–218.Google Scholar
Harrison, S. and Viers, J. H. 2007. Serpentine Grasslands. Pages 145–155 in Stromberg, M. R., Corbin, J., and D'Antonio, C., eds. California Grasslands: Ecology and Management. Berkeley, CA University of California Press.Google Scholar
Heady, H. F. 1977. Valley Grassland. Pages 491–514 in Barbour, M. G., and Major, J., eds. Terrestrial Vegetation of California. Sacramento, CA California Native Plant Society.Google Scholar
Kennedy, P. B. 1928. Goat grass or wild wheat (Aegilops triuncialis). J. Am. Soc. Agro. 20:1292–1296.Google Scholar
Kruckeberg, A. R. 1984. California Serpentines: Flora, Vegetation, Geology, Soils, and Management Problems. Berkeley, CA University of California Press. 180 p.Google Scholar
Lyons, K. G., Shapiro, A. M., and Schwartz, M. W. 2010. Distribution and ecotypic variation of the invasive annual barb goatgrass (Aegilops triuncialis) on serpentine soil. Invasive Plant Sci. Manag. 3:376–389.Google Scholar
Marushia, R. G. and Allen, E. B. 2011. Control of exotic annual grasses to restore native forbs in abandoned agricultural land. Restor. Ecol. 19:45–54.Google Scholar
Meimberg, H., Milan, N. F., Karatassiou, M., Espeland, E. K., McKay, J. K., and Rice, K. J. 2010. Patterns of introduction and adaptation during the invasion of Aegilops triuncialis (Poaceae) into Californian serpentine soils. Mol. Ecol. 19:5308–5319.Google Scholar
Murphy, D. D. and Ehrlich, P. R. 1989. Conservation biology of California's remnant native grasslands. Pages 201–211 in Huenneke, L. F., and Mooney, H. A., eds. Grassland Structure and Function: California Annual Grassland. Dordrecht, The Netherlands Kluwer Academic Publishers.Google Scholar
Pavlik, B. M., Nickrent, D. L., and Howald, A. M. 1993. The recovery of an endangered plant. I. Creating a new population of Amsinckia grandiflora . Conserv. Biol. 7:510–526.Google Scholar
Peters, A. 1994. Biology and control of barb goatgrass (Aegilops triuncialis L.). M.S. thesis. Corvallis, OR Oregon State University. 79 p.Google Scholar
Peters, A., Johnson, D. E., and George, M. R. 1996. Barb goatgrass: a threat to California rangelands. Rangelands 18:8–10.Google Scholar
Rauch, T. A., Thill, D. C., Gersdorf, S. A., and Price, W. J. 2010. Widespread occurrence of herbicide-resistant Italian ryegrass (Lolium multiflorum) in Northern Idaho and Eastern Washington. Weed Technol. 24:281–288.Google Scholar
Ruffner, M. E. and Barnes, T. G. 2010. Natural grassland response to herbicides and application timing for selective control of tall fescue, an invasive cool-season grass. Invasive Plant Sci. Manag. 3:219–228.Google Scholar
Shaw, R. G. and Mitchell-Olds, T. 1993. Anova for unbalanced data: an overview. Ecology 74:1638–1645.Google Scholar
Sokal, R. R. and Rohlf, F. J. 1995. Biometry: The Principles and Practice of Statistics in Biological Research. 3rd ed. New York, NY W. H. Freeman. 887 p.Google Scholar
Steers, R. J. and Allen, E. B. 2010. Post-fire control of invasive plants promotes native recovery in a burned desert shrubland. Restor. Ecol. 18:334–343.Google Scholar
Talbot, M. W. and Smith, L. S. 1930. The goatgrass situation in California. Monthly Bulletin of the Department of Agriculture, State of California 19:40–46.Google Scholar
Thomson, D. M. 2007. Do source–sink dynamics promote the spread of an invasive grass into a novel habitat? Ecology 88:3126–3134.Google Scholar
Wilkinson, L. 1990. SYSTAT: The System for Statistics. Evanston, IL SYSTAT, Inc. 677 p.Google Scholar
Yu, Q., Collavo, A., Zheng, M-Q., Owen, M., Sattin, M., and Powles, S. B. 2007. Diversity of acetyl-coenzyme A carboxylase mutations in resistant Lolium populations: evaluation using clethodim. Plant Physiol. 145:547–558.Google Scholar
Yu, Q., Friesen, L. J. S., Zhang, X. Q., and Powles, S. B. 2004. Tolerance to acetolactate synthase and acetyl-coenzyme A carboxylase inhibiting herbicides in Vulpia bromoides is conferred by two co-existing resistance mechanisms. Pestic. Biochem. Physiol. 78:21–30.Google Scholar