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dc.contributor.advisorBull, D. L.
dc.creatorWhitten, Chandler James
dc.description.abstractThe toxicity, metabolism, and absorption of several selected insecticides were compared between methyl parathion-susceptible (S) and -resistant (R) strains of the tobacco budworm (Heliothis virescens (F.)) to assess the influence of detoxification and absorption in the resistance exhibited by the R larvae. In addition, the relationships of certain chemical structures of dialkyloxy arylphosphate compounds to toxicity, metabolism, and absorption were evaluated. Toxicity tests made with 3rd-stage larvae indicated that the R larvae were resistant (as evidenced by a 5-fold or greater increase in the LD [subscript 50] value of an insecticide as compared with that from S larvae) to methyl parathion, methyl paraoxon, paraoxon, parathion, and fospirate, but not to chlorpyrifos, chlorpyrifosmethyl, or Dowco [superscript R] 180. Those compounds containing dimethoxy groups were more toxic than their corresponding diethoxy homologues to larvae of both strains.en
dc.format.extent93 leavesen
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en
dc.titleFactors influencing organophosphorus insecticide resistance in tobacco budwormsen
dc.typeThesisen A&M Universityen of Philosophyen
dc.contributor.committeeMemberKeeley, L. L.
dc.contributor.committeeMemberKrise, G. M.
dc.contributor.committeeMemberPace, C. N.
dc.contributor.committeeMemberPrice, M. A.
dc.format.digitalOriginreformatted digitalen
dc.publisher.digitalTexas A&M University. Libraries

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