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FECUNDITY, LONGEVITY, AND INTRINSIC NATURAL RATE OF INCREASE OF EPIDINOCARSIS LOPEZ1 (DE SANTIS) (HYMENOPTERA: ENCYRTIDAE)

Published online by Cambridge University Press:  31 May 2012

Y. Iziquel  and
B. Le Rü
Y. Iziquel
Affiliation:
E.N.S.A.T., Labratoire d'Entomologie, 145 Avenue de Muret, 31076 Toulouse cédex, France
B. Le Rü
Affiliation:
O.R.S.T.O.M., Labratoire d'Entomologie Appliquée, B.P. 181, Brazzaville, R. Congo
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Abstract

A laboratory study of the fecundity, longevity, and intrinsic natural rate of increase of Epidinocarsis lopezi (De Santis) (Hymenoptera: Encyrtidae) was performed at 26 °C, the average temperature observed in the Congo during pullulation of its host Phenacoccus manihoti Mat.-Ferr. (Homoptera: Pseudococcidae). With 30 mealybugs per female per day, the parasitoid lives for an average of 41.4 days and lays 558.5 eggs. The net reproduction rate (R0) was calculated to be 269.9 females per female per generation, the average duration of a generation (T) was 33.9 days, and the intrinsic natural rate of increase of the parasitoid (rm) was 0.213. The fecundity observed in E. lopezi in this study was much higher than the figures previously reported. The rm of the parasitoid appeared to be higher than that determined by other authors for the mealybug. The limits of such a comparison are discussed.

Résumé

Une étude au laboratoire a été réalisée sur Epidinocarsis lopezi (De Santis) (Hym. Encyrtidae) à la température de 26 °C, moyenne des températures qu’il rencontre au Congo durant la phase de pullulation de son hôte Phenacoccus manihoti Mat.-Ferr. (Horn. Pseudococcidae). En présence de 30 cochenilles par femelle et par jour, le parasitoïde vit en moyenne 41,4 jours et pond 558,5 oeufs. Le taux net de reproduction (R0) a été évalué à 269,9 femelles par femelle et par génération, la durée moyenne d’une génération (T) à 33,9 jours et le taux intrinsèque d’accroissement naturel du parasitoïde (rm) à 0,213. Il apparaît que la fécondité trouvée pour E. lopezi dans notre étude est très supérieure aux valeurs rapportées jusqu’ici, et que plusieurs facteurs peuvent l’expliquer. Par ailleurs, le rm du parasitoïde est semble-t-il plus élevé que celui de la cochenille déterminé par d’autres auteurs. On discute des limites d’une telle comparaison.

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 6 , December 1992 , pp. 1115 - 1121
Copyright
Copyright © Entomological Society of Canada 1992

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