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INTRINSIC RATE OF INCREASE AND TEMPERATURE COEFFICIENTS OF THE APHID PARASITE EPHEDRUS CALIFORNICUS BAKER (HYMENOPTERA: APHIDIDAE)

Published online by Cambridge University Press:  31 May 2012

M.B. Cohen  and
M. Mackauer
M.B. Cohen
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
M. Mackauer
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
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Abstract

The demographic statistics and the temperature requirements for development of Ephedrus californicus Baker were determined under constant laboratory conditions. At 23 °C, females provided each day with forty 2nd-instar pea aphids, Acyrthosiphon pisum (Harris), lived for 13.4 days and laid 1193 eggs on average; the highest fecundity of any female was 1762 eggs. For an assumed population sex ratio of 1:1 males to females, the intrinsic rate of increase, r, was 0.371 females·female−1·day−1 when all eggs laid were counted. The lower temperature threshold for development, t, was estimated as 6.83 °C, and the time-to-adult, K, as 228.9 degree-days. The potential use of E. californicus in the biological control of the lupine aphid, Macrosiphum albifrons Essig, in England is considered.

Résumé

On a déterminé les statistiques démographiques et les besoins thermiques pour le développement chez Ephedrus californicus Baker, maintenu sous des conditions constantes de laboratoire. A 23 °C, des femelles ayant eu journalièrement accès à 40 larves de stade 2 du puceron du pois, Acyrthosiphon pisum, ont survécu pendant 13,4 jours et ont pondu 1193 oeufs, en moyenne; la fécondité maximale observée pour une femelle est de 1762 oeufs. Si on suppose que le rapport mâles:femelles est 1:1, le taux intrinsèque d’accroissement naturel est de 0,371 femelles femelle−1 jour−1 lorsque tous les oeufs pondus sont comptés. On a estimé le seuil thermique du développement t, à 6,83 °C, et la constante thermique du développement de l’adulte, K, à 228,9 degrés-jours. On discute de la possibilité d’utiliser E. californicus pour la lutte biologique contre le puceron Macrosiphum albifrons Essig en Angleterre.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 3 , March 1987 , pp. 231 - 237
Copyright
Copyright © Entomological Society of Canada 1987

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