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BIOLOGICAL STUDIES OF CEUTORHYNCHUS TRIMACULATUS (COLEOPTERA: CURCULIONIDAE), A THISTLE ROSETTE WEEVIL

Published online by Cambridge University Press:  31 May 2012

L. T. Kok  and
T. J. McAvoy
L. T. Kok
Affiliation:
Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg 24061
T. J. McAvoy
Affiliation:
Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg 24061
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Abstract

Biological studies were conducted on Ceutorhynchus trimaculatus Fabricius, a weevil imported under quarantine from Italy into the U.S.A. for evaluation of host specificity and potential for control of Carduus thistles. Females reared under day–night temperatures of 21°–10 °C and 9 h photophase oviposited an average of 211.7 eggs over 23.6 wk; the preoviposition period was 19.9 wk. Two oviposition peaks were observed each calendar year, the first from February to April and the second in November. Eggs hatched in 12.4 days with mean viability of 64.2%. There were three larval instars; the mean larval developmental period was 42 days, and the pupal stage averaged 15.5 days. Adult longevity for males was 43.9 wk and for females 43.5 wk.

Résumé

Des études biologiques ont été effectuées sur Ceutorhynchus trimaculatus Fabricius, un charançon importé en quarantaine aux USA à partir d'Italie, afin d'évaluer sa spécificité et son potentiel de lutte contre les chardons du genre Carduus. Des femelles élevées sous un régime thermique jour-nuit de 21°–10 °C et une photophase de 9 h, ont pondu en moyenne 211.7 oeufs sur une période de 23.6 semaines; la période de préoviposition était de 19.9 semaines. Deux pics d'oviposition ont été observés à chaque année, le premier de février à avril et le second en novembre. Les oeufs ont éclos en 12.4 jours et avaient un taux de survie moyen de 64.2%. Trois stades larvaires ont été observés; la durée moyenne de développement larvaire était de 42 jours, et celle du stade pupal 15.5 jours. La longévité des mâles était de 43.9 semaines et celle des femelles de 43.5 semaines.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 8 , August 1983 , pp. 927 - 932
Copyright
Copyright © Entomological Society of Canada 1983

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References

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