Identification and management of glyphosate-resistant annual bluegrass (Poa annua L.)

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Identification and management of glyphosate-resistant annual bluegrass (Poa annua L.)

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/10546

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dc.contributor.advisor Smeda, R. J. (Reid John), 1960- en_US
dc.contributor.author Binkholder, Kenton M., 1985- en_US
dc.date.accessioned 2011-04-25T14:31:50Z
dc.date.available 2011-04-25T14:31:50Z
dc.date.issued 2010 en_US
dc.date.submitted 2010 Fall en_US
dc.identifier.other BinkholderK-121010-T679 en_US
dc.identifier.uri http://hdl.handle.net/10355/10546
dc.description Title from PDF of title page (University of Missouri--Columbia, viewed on March 25, 2011). en_US
dc.description The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. en_US
dc.description Thesis advisor: Dr. Reid J. Smeda. en_US
dc.description Includes bibliographical references. en_US
dc.description M.S. University of Missouri--Columbia 2010. en_US
dc.description Dissertations, Academic -- University of Missouri--Columbia -- Plant, insect and microbial sciences. en_US
dc.description.abstract Annual bluegrass is the most problematic weed on golf courses in the Transition Zone and Southern United States. Applications of glyphosate are common on dormant zoysiagrass to remove winter annual weeds. In 2007, a suspect population of annual bluegrass (hereafter referred to as CCMO1) in Columbia, Missouri survived an application of glyphosate following more than 10 years of continuous applications. Research was conducted in vitro to identify the extent of glyphosate-resistance in CCMO1. At the field level, alternative herbicides were evaluated for effectiveness on CCMO1. Finally, greenhouse studies were conducted to determine the impact of glyphosate on annual bluegrass seed production at different growth stages. Results indicate that the CCMO1 biotype of annual bluegrass is glyphosate resistant, with an I50 of 0.49 kg/ae ha-1 for CCMO1 compared to 0.09 kg/ha-1 for S. This resulted in a resistance index (R:S I50 ratio) of 5.2 for CCMO1. Field results demonstrated that pre-emergence (PRE) herbicides significantly improved CCMO1 control versus post-emergence (POST) herbicides. The addition of a POST herbicide following a PRE resulted in the most consistent control of annual bluegrass. Seed production in the absence of glyphosate was 15,000 to 16,000 and 21,000 to 30,000 seeds per plant for S and CCMO1 plants, respectively. The addition of glyphosate reduced the number of seeds by 98% and 85% for S and CCMO1 plants, respectively. However, use of glyphosate at recommended rates resulted in viable production of seeds from CCMO1 plants, suggesting that continued applications of glyphosate on glyphosate-resistant annual bluegrass will increase viable seeds in the soil seed-bank. en_US
dc.format.extent ix, 100 pages en_US
dc.language.iso en_US en_US
dc.publisher University of Missouri--Columbia en_US
dc.subject.lcsh Annual bluegrass -- Weed control en_US
dc.subject.lcsh Herbicide resistance en_US
dc.subject.lcsh Golf courses -- Maintenance en_US
dc.title Identification and management of glyphosate-resistant annual bluegrass (Poa annua L.) en_US
dc.type Thesis en_US
thesis.degree.discipline Plant, insect and microbial sciences en_US
thesis.degree.grantor University of Missouri--Columbia en_US
thesis.degree.name M.S. en_US
thesis.degree.level Masters en_US
dc.identifier.merlin b82190975
dc.identifier.oclc 710218684 en_US
dc.relation.ispartofcommunity University of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2010 Theses
dc.relation.ispartofcollection 2010 Freely available theses (MU)


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