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Contribution a l'Étude de la Reproduction Chez les Cochenilles Diaspines. I. Influence de l'Élevage au Laboratoire et de l'Accouplement Différé sur la Fécondité et le Sex-Ratio de Chrysomphalus Ficus Ashmead [Homoptera-Diaspididae]

Contribution a l'Étude de la Reproduction Chez les Cochenilles Diaspines. I. Influence de... Summary In the laboratory, on substitution host and under optimal conditions of temperature and hygrometry, C. ficus has its fecundity strongly increased by comparison with the one observed in Citrus groves (240 eggs against 100). The total period of oviposition is correlatively increased (48 days on average, against 30 days). The egg-laying frequency is directly proportional to the total number of emitted larvae, the first laying period beeing already constant (23 to 28 days). For the sex-ratio, it varies in the grove to the advantage of the females when the bioclimatic conditions become better (from 45 to 80%, varying with the temperature and the organ of the three); in the laboratory, it is of 77% for the females. On a other hand, delayed mating induces, as in many other species, a significative increase in the sex-ratio to the advantage of the males (from 23,3% to 76,1%). Correlatively, the fecundity decreases (from 240 to 130 larvae emitted on average). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annales de la Société entomologique de France (N S ) Taylor & Francis

Contribution a l'Étude de la Reproduction Chez les Cochenilles Diaspines. I. Influence de l'Élevage au Laboratoire et de l'Accouplement Différé sur la Fécondité et le Sex-Ratio de Chrysomphalus Ficus Ashmead [Homoptera-Diaspididae]

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Publisher
Taylor & Francis
Copyright
© 1981 Société entomologique de France
ISSN
2168-6351
eISSN
0037-9271
DOI
10.1080/21686351.1981.12278270
Publisher site
See Article on Publisher Site

Abstract

Summary In the laboratory, on substitution host and under optimal conditions of temperature and hygrometry, C. ficus has its fecundity strongly increased by comparison with the one observed in Citrus groves (240 eggs against 100). The total period of oviposition is correlatively increased (48 days on average, against 30 days). The egg-laying frequency is directly proportional to the total number of emitted larvae, the first laying period beeing already constant (23 to 28 days). For the sex-ratio, it varies in the grove to the advantage of the females when the bioclimatic conditions become better (from 45 to 80%, varying with the temperature and the organ of the three); in the laboratory, it is of 77% for the females. On a other hand, delayed mating induces, as in many other species, a significative increase in the sex-ratio to the advantage of the males (from 23,3% to 76,1%). Correlatively, the fecundity decreases (from 240 to 130 larvae emitted on average).

Journal

Annales de la Société entomologique de France (N S ) – Taylor & Francis

Published: Apr 30, 1981

Keywords: Homoptera; Diaspididae; Chrysomphalus; attraction sexuelle; accouplement; accouplement différé; période d'oviposition; ponte; fécondité; sex-ratio

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