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INFLUENCE OF TEMPERATURE ON SURVIVAL AND RATE OF DEVELOPMENT OF PTEROMALUS VENUSTUS (HYMENOPTERA: PTEROMALIDAE), A PARASITE OF THE ALFALFA LEAFCUTTER BEE (HYMENOPTERA: MEGACHILIDAE)

Published online by Cambridge University Press:  31 May 2012

G.H. Whitfield  and
K.W. Richards
G.H. Whitfield
Affiliation:
Agriculture Canada Research Station, Lethbridge, Alberta, Canada T1J 4B1
K.W. Richards
Affiliation:
Agriculture Canada Research Station, Lethbridge, Alberta, Canada T1J 4B1
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Abstract

Incidence of parasitism by Pteromalus venustus Walker in populations of the alfalfa leafcutter bee, Megachile rotundata (F.), in western Canada from 1976 to 1983 was found to average ca. 1%. An average of 17.4 parasite adults emerged from each host cocoon and the ratio of males to females was 1:1. Temperature-dependent development and survival at 8 constant temperatures are described. The range of temperatures for greatest survival of the parasite (30–32 °C) coincided with the recommended incubation temperatures for cocoons of the leafcutter bee. Development data fitted a 4-parameter development model. Linear regression of development rate versus temperature provided estimates of base temperature and development time in degree-days for the egg, larval, pupal, and combined stages.

Résumé

On a trouvé que l'incidence du parasitisme des populations de l'abeille découpeuse de la luzerne, Megachile rotundata (F.), par Pteromalus venustus Walker dans l'ouest canadien de 1976 à 1983 était de 1% en moyenne. En moyenne, 17,4 parasites adultes ont émergé de chaque cocon de l'hôte, dans un rapport mâle : femelle de 1 : 1. On décrit la réponse du développement et la survie à 8 température constantes. L'écart des températures les plus favorables à la survie du parasite (30–32 °C) coïncide avec les températures recommandées pour l'incubation des oeufs de l'abeille découpeuse. Les données de la réponse du développement ont été ajustées à un modèle à 4 paramètres. Une régression linéaire du taux de développement en fonction de la température a fourni des estimés du seuil thermique et du temps physiologique de développement en degrés-jours pour les stades oeuf, larve, pupe et pour leur ensemble.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 7 , July 1985 , pp. 811 - 818
Copyright
Copyright © Entomological Society of Canada 1985

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