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Spatial factors affecting white grub presence and abundance in golf course turf

dc.contributor.authorDimock, William Johnen
dc.contributor.committeecochairLewis, Edwin E.en
dc.contributor.committeecochairWeaver, Michael Johnen
dc.contributor.committeememberBrewster, Carlyle C.en
dc.contributor.committeememberStone, Nicholas D.en
dc.contributor.committeememberChalmers, David R.en
dc.contributor.departmentEntomologyen
dc.date.accessioned2011-08-22T19:02:12Zen
dc.date.adate2004-06-04en
dc.date.available2011-08-22T19:02:12Zen
dc.date.issued2004-04-27en
dc.date.rdate2004-06-04en
dc.date.sdate2004-05-26en
dc.description.abstractA regional IPM project was initiated with four rounds of sampling for white grubs on the fairways of nine golf courses located on the Lower Peninsula of eastern Virginia, from 2000 through 2002. Fifteen regressor variables were collected and measured that included local-scale variables, golf course management practices and spatial pattern metrics derived from satellite images that underwent two methods of a supervised classification of six land-cover types (turf, woods, wetland, urban, bare soil and water) on four landscape scales derived from 10 km x 10 km buffer zones surrounding each golf course. Pearson's correlation coefficients were calculated to reduce the number of variables to a few that were highly correlated with white grub densities. Mallow's C(p) calculations were performed on the reduced variable sets to extract those that would be highly predictive. A multiple linear regression was performed using the Mallow's variables to develop eight regression equations (two classification methods x four landscape scales) that were used to predict regional white grub presence and abundance in 2003 on six additional golf courses located on the Lower Peninsula. The best model was the 6 km x 6 km buffer zones model from the second classification method, which included one local-scale variable (golf course age) and three spatial pattern metrics (total turf area, total turf area-to-total urban area ratio, and a woods interspersion-juxtaposition index). The mean difference between actual and predicted values was -0.15, standard deviation = 0.79, R2 = 81.38%. Additionally, a study was conducted to determine whether the number of white grubs collected from transects of sampled golf course fairways was significantly different from those found in the roughs. White grub counts from the roughs were significantly higher (mean = 0.283 grubs/transect, standard error = 0.0135) than those from fairways (mean = 0.146 grubs/transect, standard error = 0.0188); t = -4.31, df = 735, P = 0.0001.en
dc.description.degreePh. D.en
dc.format.mediumETDen
dc.identifier.otheretd-05262004-101931en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05262004-101931en
dc.identifier.urihttp://hdl.handle.net/10919/11189en
dc.publisherVirginia Techen
dc.relation.haspartWJD-Dissertation-Final.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectRegional IPMen
dc.subjectWhite Grubsen
dc.subjectRemote Sensingen
dc.subjectSpatial Pattern Analysisen
dc.subjectSpatial Ecologyen
dc.titleSpatial factors affecting white grub presence and abundance in golf course turfen
dc.typeDissertationen
thesis.degree.disciplineEntomologyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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