Evaluation of Screening Techniques for Woody Plant Herbicide Development

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dc.contributor.authorBlair, Mitchellen
dc.contributor.committeechairZedaker, Shepard M.en
dc.contributor.committeememberBurch, Patrick L.en
dc.contributor.committeememberHipkins, Perry Lloyden
dc.contributor.committeememberSeiler, John R.en
dc.contributor.departmentForestryen
dc.date.accessioned2014-03-14T20:35:06Zen
dc.date.adate2004-05-24en
dc.date.available2014-03-14T20:35:06Zen
dc.date.issued2004-02-02en
dc.date.rdate2012-04-30en
dc.date.sdate2004-05-05en
dc.description.abstractWoody plant herbicide screening techniques were evaluated in an attempt to expedite the screening process and decrease amounts of herbicide active ingredient required. Rapid greenhouse screening of woody plant seedlings was performed in less than six months while rapid seed screening was performed in less than twenty days. A traditional field screen, requiring ten months, was performed for comparison purposes. Leaf area – biomass ratios were also examined for their influence on herbicide efficacy. Linear regressions were performed using traditional field screen data as the dependent variable and rapid screening technique data as the independent data. Rapid screens using triclopyr produced more statistically significant regressions compared to those involving imazapyr. Significant regressions were produced that could predict field response of several species using both herbicides and either rapid screening technique. This indicated that rapid screening techniques could determine herbicide efficacy and/or species spectrum of control in much less time with much less herbicide. Rapid seed screens could estimate species spectrum within five days after treatment. The rapid greenhouse screen and rapid seed screen techniques can provide woody plant herbicide developers initial efficacy and spectrum of control data in a cost- and time- effective manner. Testing showed that as woody plants mature from seedling to sapling, there is a decrease in the leaf area — total aboveground biomass ratio. The decrease in this ratio consistently decreased efficacy of both imazapyr and triclopyr at the lower active ingredient rates. Seedlings with the higher leaf area – biomass ratio had, on the average, higher efficacy response rates to herbicide treatments.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05052004-112539en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05052004-112539/en
dc.identifier.urihttp://hdl.handle.net/10919/32215en
dc.publisherVirginia Techen
dc.relation.haspartBlairFrontMatter.pdfen
dc.relation.haspartBlairBody.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectrapid seed screenen
dc.subjectimazapyren
dc.subjecttriclopyren
dc.subjectleaf area – biomass ratioen
dc.subjecttraditional field screenen
dc.subjectforestryen
dc.subjectherbicidesen
dc.subjectwoody planten
dc.subjectrapid greenhouse screenen
dc.titleEvaluation of Screening Techniques for Woody Plant Herbicide Developmenten
dc.typeThesisen
thesis.degree.disciplineForestryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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