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The influence of pheromone dispenser release rates, trap height and pheromone dispenser height on captures of leafrollers in Virginia apple orchards

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dc.contributor.authorMalone, Sean M.en
dc.contributor.departmentEntomologyen
dc.date.accessioned2014-03-14T21:28:58Zen
dc.date.adate2009-02-13en
dc.date.available2014-03-14T21:28:58Zen
dc.date.issued1996en
dc.date.rdate2009-02-13en
dc.date.sdate2009-02-13en
dc.description.abstractGravimetric analysis was used to determine the release rates and longevities of several designs of pheromone dispensers for mating disruption of leafrollers and codling moth, Cydia pomonella (Linneaus). Release rates were described by linear equations for at least four months, but by the end of the season release rates tended to become erratic. Biocontrol’s red-brown codling moth dispenser lasted for up to four months, and one application of the dispenser in early May should control codling moth for the entire season in Virginia apple orchards. Ecogen and Hercon leafroller dispensers lasted for a shorter time than the codling moth dispensers and would require two applications per season to provide the best control of their target pests. In a commercial northern Virginia apple orchard, the effects of pheromone trap height and pheromone dispenser height on captures of the tufted apple bud moth, Platynota idaeusalis (Walker), were studied. Low traps (2.0 m) were more sensitive than high traps (4.5 m) for monitoring tufted apple bud moth. The number of moths caught in 1994 and 1995 in a two-hectare mating disruption plot with pheromone dispensers placed in the upper third of the tree was not significantly different from the number caught in a plot with pheromone dispensers placed at head height. Fruit damage was very high in both pheromone plots in 1994, but by 1995 it appeared that mating disruption was able to reduce fruit damage due to leafroller larvae.en
dc.description.degreeMaster of Scienceen
dc.format.extentvii, 70 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-02132009-171101en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02132009-171101/en
dc.identifier.urihttp://hdl.handle.net/10919/41030en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1996.M356.pdfen
dc.relation.isformatofOCLC# 35358692en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectpheromoneen
dc.subjectappleen
dc.subjectmating disruptionen
dc.subjectleafrolleren
dc.subjectrelease rateen
dc.subjecttrap heighten
dc.subject.lccLD5655.V855 1996.M356en
dc.titleThe influence of pheromone dispenser release rates, trap height and pheromone dispenser height on captures of leafrollers in Virginia apple orchardsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineEntomologyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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