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POSTERIOR DISPERSAL OF EGGS AND LARVAE OF MICROCTONUS VITTATAE (HYMENOPTERA: BRACONIDAE) IN CRUCIFER-INFESTING FLEA BEETLES (COLEOPTERA: CHRYSOMELIDAE)1

Published online by Cambridge University Press:  31 May 2012

H.G. Wylie
H.G. Wylie
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba R3T 2M9
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Abstract

Microctonus vittatae Mues. oviposit in the hemolymph of flea beetles, Phyllotreta striolata (F.) and Phyllotreta cruciferae (Goeze), by inserting the ovipositor into the host's mouth and occasionally, membranous areas between body segments. Some of the eggs are transported in the hemolymph posteriorly from the head to the thorax or abdomen, and some laid in the thorax are carried into the abdomen, but eggs hatch in all 3 body regions of the hosts. First-instar larvae that eclose in the head and thorax disperse into the abdomen where they develop. Egg and larval dispersal into the abdomen increase the probability that the parasite has adequate space for development.

Résumé

Microctonus vittatae Mues. pond dans l'hémolymphe des altises Phyllotreta striolata (F.) et Phyllotreta cruciferae (Goeze), en insérant son ovipositeur dans la bouche de son hôte ou parfois dans les parties membraneuses situées entre les segments du corps. Certains oeufs pondus dans la tête sont transportés postérieurement dans l'hémolymphe vers le thorax et l'abdomen, et certains parmi ceux pondus dans le thorax sont transportés vers l'abdomen, mais des oeufs éclosent dans les 3 parties du corps. Les larves de premier stade écloses dans la tête et le thorax migrent vers l'abdomen où elles se développent. Le déplacement des oeufs et des larves vers l'abdomen augmente la probabilité que le parasite ait suffisamment d'espace pour son développement.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 5 , May 1985 , pp. 541 - 545
Copyright
Copyright © Entomological Society of Canada 1985

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