[-] Show simple item record

dc.contributor.advisorSmeda, R. J. (Reid John), 1960-eng
dc.contributor.authorBinkholder, Kenton M., 1985-eng
dc.date.issued2010eng
dc.date.submitted2010 Falleng
dc.descriptionTitle from PDF of title page (University of Missouri--Columbia, viewed on March 25, 2011).eng
dc.descriptionThe 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.eng
dc.descriptionThesis advisor: Dr. Reid J. Smeda.eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionM.S. University of Missouri--Columbia 2010.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Plant, insect and microbial sciences.eng
dc.description.abstractAnnual 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.eng
dc.format.extentix, 100 pageseng
dc.identifier.merlinb82190975eng
dc.identifier.oclc710218684eng
dc.identifier.otherBinkholderK-121010-T679eng
dc.identifier.urihttp://hdl.handle.net/10355/10546eng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollection2010 Freely available theses (MU)eng
dc.relation.ispartofcommunityUniversity of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2010 Theseseng
dc.subject.lcshAnnual bluegrass -- Weed controleng
dc.subject.lcshHerbicide resistanceeng
dc.subject.lcshGolf courses -- Maintenanceeng
dc.titleIdentification and management of glyphosate-resistant annual bluegrass (Poa annua L.)eng
dc.typeThesiseng
thesis.degree.disciplinePlant, insect and microbial sciences (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.S.eng


Files in this item

[PDF]
[PDF]
[PDF]

This item appears in the following Collection(s)

[-] Show simple item record