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DISCRIMINATION BY HYSSOPUS THYMUS (HYMENOPTERA: EULOPHIDAE) AGAINST ORGILUS OBSCURATOR (HYMENOPTERA: BRACONIDAE), AN INTERNAL PARASITE OF THE EUROPEAN PINE SHOOT MOTH, RHYACIONIA BUOLIANA (LEPIDOPTERA: OLETHREUTIDAE)

Published online by Cambridge University Press:  31 May 2012

Paul D. Syme
Paul D. Syme
Affiliation:
Forest Research Laboratory, Canadian Forestry Service, Sault Ste. Marie, Ontario
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Abstract

When given a choice of large, unparasitised sixth-instar larvae of the European pine shoot moth, Rhyacionia buoliana, and small sixth instars containing developing Orgilus obscurator, Hyssopus thymus selected the former. This discrimination does not exist when the host larvae are in the third or fourth instars. The size of the contained O. obscurator larva is related to this change in behaviour. H. thymus shows no cleptoparasitic tendencies and is recommended as a safe candidate for introduction where O. obscurator exists.

Type
Articles
Information
The Canadian Entomologist , Volume 102 , Issue 12 , December 1970 , pp. 1523 - 1527
Copyright
Copyright © Entomological Society of Canada 1970

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