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The Effects of European corn borer on whole-plant yieldand root knot nematode fitness in corn

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dc.contributor.authorTiwari, Siddharthen
dc.contributor.committeechairYoungman, Roger R.en
dc.contributor.committeememberPaulson, Sally L.en
dc.contributor.committeememberLewis, Edwin E.en
dc.contributor.committeememberBrewster, Carlyle C.en
dc.contributor.committeememberJohnson, Charles S.en
dc.contributor.departmentEntomologyen
dc.date.accessioned2014-03-14T20:11:26Zen
dc.date.adate2007-05-07en
dc.date.available2014-03-14T20:11:26Zen
dc.date.issued2007-04-26en
dc.date.rdate2010-10-08en
dc.date.sdate2007-05-02en
dc.description.abstractField studies were conducted over two growing seasons to evaluate the effect of different levels of third instar European corn borer, Ostrinia nubilalis Hübner (Lepidoptera: Crambidae), on whole-plant dry matter in corn grown for silage. Mean (± SEM) whole-plant dry matter was significantly greater by 18.8% in uninfested control plants than in plants with an infestation level of 6 larvae/plant in 2004. Whole-plant dry matter in 2005 was significantly greater by 10.5% in control plants than in plants with an infestation level of 5 larvae/plant. Economic injury levels were calculated for each year using regression equations between whole-plant dry matter and European corn borer infestation level. Plant growth stage and infestation level had no effect on percent acid detergent fiber, neutral detergent fiber, and crude protein values for either year. Greenhouse studies were conducted to examine the relationship between aboveground herbivory by European corn borer and belowground herbivory by root knot nematode, Meloidogyne incognita Chitwood (Tylenchida: Heteroderidae), in corn. Two experiments were conducted to measure belowground herbivory by M. incognita in juvenile penetrations and eggs/root system. In the first experiment, the main effects interaction was not significant for either M. incognita juvenile penetrations or eggs/root system. Overall mean juvenile penetrations/root system across all three growth stages, at infestation levels of 1 and 3 larvae/plant were significantly less than in the non-infested control. In addition, overall mean eggs/root system at an infestation level of 3 larvae/plant were significantly less than in the control. In the second experiment, the main effects interaction was significant for both juvenile penetrations and eggs/root system. At the 8 and 10 leaf growth stages, juvenile penetrations/root system at infestation levels of 1 and 3 larvae/plant were significantly less than in the control. In addition, eggs/root system at an infestation level of 3 larvae/plant were significantly less than in the control, at all growth stages. In the reciprocal study, which examined the effect of different M. incognita inoculation levels on European corn borer stalk tunneling, no significant effect of inoculation level on European corn borer stalk tunneling was found.en
dc.description.degreePh. D.en
dc.identifier.otheretd-05022007-155905en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05022007-155905/en
dc.identifier.urihttp://hdl.handle.net/10919/27501en
dc.publisherVirginia Techen
dc.relation.haspartDissertation.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectcorn silageen
dc.subjectaboveground herbivoryen
dc.subjectbelowground herbivoryen
dc.subjectEuropean corn boreren
dc.subjectroot knot nematodeen
dc.titleThe Effects of European corn borer on whole-plant yieldand root knot nematode fitness in cornen
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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