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dc.contributor.authorBoucher, T. Judeen_US
dc.date.accessioned2016-06-14T20:17:37Z
dc.date.available2016-06-14T20:17:37Z
dc.date.issued1986en_US
dc.identifier.urihttp://hdl.handle.net/10919/71342
dc.description.abstractThe natural infestation level for 1985 of the Japanese beetle, Popillia japonica Newman, in the Shenandoah Valley of Virginia failed to reduce berry quality, yield or shoot growth in a commercial vineyard. Intensive postveraison foliage feeding by Japanese beetle resulted 1n fruit with lower soluble solids and higher total titratable acidity at harvest, but did not affect pH, sugar per berry, berry weight, yield, leaves per vine or shoot length. Intensive previraison feeding also resulted in fruit with higher total titratable acidity. All other parameters were unaffected. In a separate experiment with 0, 10, 20, and 33% leaf removal, no relationship was shown between leaf area loss and soluble solids, total titratable acidity or pH. Data from one season of damage by the beetle indicate that control measures may not be warranted in some years. In a third experiment, grape leaves on potted vines were artificially damaged by removing leaf disks with a paper punch. The leaves showed an increased loss of efficiency (measured in net photosynthesis, Pn) for the remaining tissue as leaf area loss (LAL) increased. This loss of efficiency in the remaining leaf area at low levels of damage was more pronounced after 12 days than after either 1 or 5 days. The additive effect on Pn of both LAL and lowered efficiency predicted the total shutdown of Pn at 60% damage at 1 and 5 days after treatment, but not at 12 days.
dc.format.extentix, 63 leavesen_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.publisherVirginia Polytechnic Institute and State Universityen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subject.lccLD5655.V855 1986.B682en_US
dc.subject.lcshJapanese beetleen_US
dc.subject.lcshGrapes -- Diseases and pests -- Virginiaen_US
dc.subject.lcshGrapes -- Physiologyen_US
dc.titleJapanese beetle Popillia japonica Newman : foliar feeding on wine grapes in Virginiaen_US
dc.typeThesisen_US
dc.contributor.departmentEntomologyen_US
dc.description.degreeMaster of Scienceen_US
dc.identifier.oclc14769308en_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEntomologyen_US
dc.type.dcmitypeTexten_US


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