Title page for ETD etd-10022008-063312

Type of Document Master's Thesis
Author Guerra, Antonio A.
URN etd-10022008-063312
Title Development of female sex organs during aestivation in the alfalfa weevil, Hypera postica (Gyll.) (Coleoptera, Curculionidae)
Degree Master of Science
Department Entomology
Advisory Committee
Advisor Name Title
Bishop, J. Russell Committee Chair
Cochran, D. G. Committee Member
Engel, R. W. Committee Member
Grayson, James McD. Committee Member
  • Alfalfa weevil
Date of Defense 1962-06-05
Availability restricted

Laboratory studies and field observations were conducted to ascertain the development of the female sex organs of the alfalfa weevil during aestivation, to study the role of this aestivation on sexual development, and to investigate the factors responsible for this interaction.

Measurements of female sex organs were made in dissected weevils at monthly intervals to observe each of the developmental stages of sexual maturation. Results of this sexual development as it progressed after adult emergence, were presented by means of tables, graphs, and a series of photographs.

The importance of not confusing old and new weevils was recognized in this work, since their behavioral patters differ in many respects. The nature and physiology of the aestivation of this weevil was discussed and evidence was presented to support the author's suggestion that this aestivation is a "true diapause." It was demonstrated in this paper that diapause synchronized the sexual growth of the alfalfa weevil to the seasonal changes of the year for species adaptation and survival.

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