Components of seasonal soybean infestation by Heliothis zea in eastern Virginia, with emphasis on multivariate analysis of field susceptibility

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dc.contributor.authorKnausenberger, Janice G. Burten
dc.contributor.committeechairAllen, William A.en
dc.contributor.committeememberSmith, John C.en
dc.contributor.committeememberGiles, Robert H. Jr.en
dc.contributor.committeememberGrayson, James McD.en
dc.contributor.departmentEntomologyen
dc.date.accessioned2014-03-14T20:41:32Zen
dc.date.adate2009-07-16en
dc.date.available2014-03-14T20:41:32Zen
dc.date.issued1978-11-05en
dc.date.rdate2009-07-16en
dc.date.sdate2009-07-16en
dc.description.abstractHeliothis zea (Boddie) (Lepidoptera: Noctuidae) density, development, and relationships with host crops were studied in eastern Virginia. Six instars occur. The larval population in corn is the reservoir for the generation in soybeans. An estimator, based on the reservoir population, permitted calculation of the larval density in soybeans. An index, based on blacklight trap and emergence data, permitted precise timing ot peak moth flight to soybeans. Regression analyses of biotic and abiotic factors revealed that soybean plant morphometrics best explained corn earworm densities. Discriminant analyses on empiricala priori soybean field susceptibility categories (described by plant morphometrics) classified five levels of anticipated maximum larval densities 80 - 98 percent correctly. Development of highest larval densities was synchronized with overall plant growth and specific pod development: third and fourth instars were present during rapid pod elongation, while fifth and sixth were present during rapid pod volume increase.en
dc.description.degreeMaster of Scienceen
dc.format.extentxx, 412 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-07162009-040215en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07162009-040215/en
dc.identifier.urihttp://hdl.handle.net/10919/34031en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1978.K63.pdfen
dc.relation.isformatofOCLC# 39900975en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectinsect densityen
dc.subject.lccLD5655.V855 1978.K63en
dc.titleComponents of seasonal soybean infestation by Heliothis zea in eastern Virginia, with emphasis on multivariate analysis of field susceptibilityen
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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