rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Factors affecting winter survival of Heliothis virescens (Fabricius) and Heliothis zea (Boddie) (Lepidoptera: Noctuidae), and subsequent development on wild spring host plants
  name:
    name part: Eger, Joseph Edward.
    role:
      role term: creator
  name:
    name part: Sterling, W. L
    role:
      role term: degree supervisor.
  name:
    name part: Gates, C. E.
    role:
      role term: degree comittee member.
  name:
    name part: Hartstack, A. W.
    role:
      role term: degree comittee member.
  name:
    name part: Keeley, L. L.
    role:
      role term: degree comittee member.
  name:
    name part: Plapp, F. W.
    role:
      role term: degree comittee member.
  name:
    name part: Sweet, M. H.
    role:
      role term: degree comittee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1981
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xi, 156 leaves : illustrations ; 29 cm
  abstract: Mortality of diapausing pupae of Heliothis virescens (Fabricius) and H. zea (Boddie) at temperatures of 10 to -10(DEGREES)C was assessed in the laboratory. A comparison of the exposure times necessary to induce 50% mortality (LT(,50)) indicated that survival of diapausing pupae was significantly higher than that of non-diapausing pupae. Similar comparisons showed no consistent differences in mortality of pupae from different geographic locations within Texas or in pupae preconditioned in several different ways, with the exception of pupae preconditioned at varying temperatures. Contact moisture significant decreased the LT(,50) values of pupae of both species at sub-zero temperatures. Predictive models for low temperature mortality were developed for dry, diapausing pupae. Pupae of H. virescens and H. zea, in plastic vials and in different soils, were exposed to normal winter temperatures in an insectary in College Station, Texas, during the winters of 1978-79 and 1979-80. Survival of H. zea was higher than that of H. virescens in vials during both winters and in soils during 1978-79. Contact moisture significantly reduced survival of pupae of H. zea in vials during both winters, but reduction in the survival of pupae of H. virescens due to the presence of contact moisture was not significant in either winter. No consistent differences were observed in the survival of either species in 3 different soil types or in sterile and non-sterile soils. Increased soil moisture resulted in significant reductions in the survival of both species during 1978-79 and of H. virescens during 1979-80. Termination of diapause by pupae of H. zea in soils due to a warm fall in 1979-80 resulted in greatly decreased survival compared to expected survival based on low temperatures. ...
  note: Typescript (photocopy).
  note: Vita.
  note: "Major subject: Entomology."
  note: Ph. D. in Philosophy Texas A & M University 1981
  note: Includes bibliographical references (leaves 83-89).
  subject:
    topic: Insect-plant relationships
  subject:
    topic: Cold
    topic: Physiological effect
  subject:
    topic: Plants
    topic: Effect of cold on
  subject:
    topic: Lepidoptera
  subject:
    topic: Entomology
  identifier: http://hdl.handle.net/1969.1/Dissertations-646868
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://hdl.handle.net/1969.1/Dissertations-646868
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 811219
    record change date: 20190325092016.0
    record identifier: in00000633978
    language of cataloging:
      language term: eng