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DISCRIMINATION BETWEEN PARASITIZED AND NONPARASITIZED HOSTS BY THE GYPSY MOTH LARVAL PARASITOID, APANTELES MELANOSCELUS (HYMENOPTERA: BRACONIDAE)

Published online by Cambridge University Press:  31 May 2012

Ronald M. Weseloh
Ronald M. Weseloh
Affiliation:
Department of Entomology, The Connecticut Agricultural Experiment Station, New Haven
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Abstract

Observations of behavior and dissections of hosts were carried out to investigate the ability of Apanteles melanoscelus Ratzeburg (Hymenoptera: Braconidae) to distinguish between parasitized and nonparasitized gypsy moth larvae, Porthetria dispar (L.) (Lepidoptera: Lymantriidae). Fewer host examinations occurred and fewer eggs were laid in hosts which had been parasitized 0–9 days previously than in those which had never been parasitized. However, superparasitism occurred readily especially when few unparasitized hosts were available. By dissecting hosts which were parasitized more than once it was possible to investigate competition between supernumerary parasitoids. First instars are eliminated by some mechanism (possibly active combat), and older parasitoids eliminate younger ones.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 4 , April 1976 , pp. 395 - 400
Copyright
Copyright © Entomological Society of Canada 1976

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