Full TGIF Record # 196155
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DOI:10.1614/WS-D-11-00139.1
Web URL(s):http://www.bioone.org/doi/full/10.1614/WS-D-11-00139.1
    Last checked: 03/2008
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http://www.bioone.org/doi/pdf/10.1614/WS-D-11-00139.1
    Last checked: 01/20/2012
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Publication Type:
i
Refereed
Author(s):Brosnan, James T.; Breeden, Gregory K.; Mueller, Thomas C.
Author Affiliation:Brosnan: Assistant Professor; Breeden: Extension Specialist; Mueller: Professor, Department of Plant Sciences, University of Tennessee, Knoxville, TN
Title:A glyphosate-resistant biotype of annual bluegrass in Tennessee
Section:Weed management
Other records with the "Weed management" Section
Source:Weed Science. Vol. 60, No. 1, January-March 2012, p. 97-100.
Publishing Information:Champaign, IL: Weed Science Society of America
# of Pages:4
Keywords:TIC Keywords: Analytical methods; Cynodon; Dormancy; Glyphosate; Herbicide resistance; Infestations; Lethal dose; Photochemical efficiency; Poa annua; Seed production; Tillers (vegetative); Weed control
Abstract/Contents:"Glyphosate is regularly used to control annual bluegrass populations in dormant bermudagrass turf. A population of annual bluegrass not controlled by glyphosate at 840 g ha1 (glyphosate resistant, GR) was identified on a golf course in Humboldt, TN in 2010. Mature tillers of GR plants were established in a greenhouse and treated with glyphosate at 0, 210, 420, 840, 1,680, 3,360, and 6,720 g ha1. Mature tillers of a biotype known to be susceptible to glyphosate (SS) were also established in the greenhouse and subjected to the same treatments. At 14 d after treatment (DAT), glyphosate controlled the SS biotype >95% at rates >420 g ha1. Comparatively, the GR biotype was only controlled 76% with glyphosate at 6,720 g ha1. The rates required to provide 50% control (I50 values) for SS and GR biotypes were 236 and 2,812 g ha1 respectively, resulting in a resistance factor of 12. Photochemical efficiency (Fv/Fm) values on SS plants treated with glyphosate at >210 g ha1 measured 0.000 at 14 DAT, whereas Fv/Fm values on GR plants were not significantly different from the untreated control with glyphosate rates ^D<=840 g ha1 on the same date. In laboratory experiments, the SS biotype accumulated greater shikimate concentrations than the GR biotype 3 to 6 DAT. Future research should evaluate strategies for managing GR and SS annual bluegrass with alternative modes of action."
Language:English
References:30
See Also:Updated version appears in Golfdom, 69(2) February 2013, p. 38-41, R=215962. R=216962
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Brosnan, J. T., G. K. Breeden, and T. C. Mueller. 2012. A glyphosate-resistant biotype of annual bluegrass in Tennessee. Weed Sci. 60(1):p. 97-100.
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DOI: 10.1614/WS-D-11-00139.1
Web URL(s):
http://www.bioone.org/doi/full/10.1614/WS-D-11-00139.1
    Last checked: 03/2008
    Access conditions: Item is within a limited access website
http://www.bioone.org/doi/pdf/10.1614/WS-D-11-00139.1
    Last checked: 01/20/2012
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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