Show simple item record

dc.contributor.authorBerisford, C. Wayneen_US
dc.date.accessioned2014-03-14T21:22:39Z
dc.date.available2014-03-14T21:22:39Z
dc.date.issued1968-06-19en_US
dc.identifier.otheretd-10302008-120438en_US
dc.identifier.urihttp://hdl.handle.net/10919/40271
dc.description.abstractThe pine engraver beetles (~ spp.:Coleoptera:Scolytidae) may be serious pests depending on certain prerequisi.te conditions. In their secondary or "normal" role they breed in slash and damaged, dying, and dead trees. The broods emerging from these sources normally attack similar material. When such material is scarce due to cessation of cutting operations in mid-season or when conditions are especially favorable for brood development, an excess of beetles is often produced which, due to the lack of more suitable material, attack healthy trees. Repeated attacks cause these trees to succumb and die. When normally healthy trees are weakened by fire, flood, defoliation, drought, stagnation, etc., then they become more acceptable host material for successful engraver attacks. When the production of a very large number of beetles in "normal" breeding material coincides with physiological stress in "healthy" trees, then population explosions can occur. When large numbers of beetles and low host vigor do not coincide, spot kills cornnon1y occur. According to Thatcher (32), spot kills, although not conspicuous, add up to large volumes of timber loss each year.en_US
dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V856_1968.B4.pdfen_US
dc.subjectPineen_US
dc.subject.lccLD5655.V856 1968.B4en_US
dc.titleHymenopterous parasites of lps spp. bark beetles (Coleoptera:Scolytidae) in Virginiaen_US
dc.typeDissertationen_US
dc.contributor.departmentEntomologyen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Instituteen_US
thesis.degree.disciplineEntomologyen_US
dc.contributor.committeechairHeikkenen, Herman Johnen_US
dc.contributor.committeechairMadgwick, H. A. I.en_US
dc.contributor.committeememberGrayson, James McD.en_US
dc.contributor.committeememberPienkowski, Robert L.en_US
dc.contributor.committeememberTurner, E. Craig Jr.en_US
dc.contributor.committeememberNeff, Stewart E.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10302008-120438/en_US
dc.date.sdate2008-10-30en_US
dc.date.rdate2008-10-30
dc.date.adate2008-10-30en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record