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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 |
Publication Type:
| 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
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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
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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 |
| MSU catalog number: b2203399a |
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