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Published online by Cambridge University Press:  31 May 2012

Christine G. Niwa
Pacific Northwest Research Station, Forestry Sciences Laboratory, Corvallis, Oregon, USA97331


Sixteen hymenopteran and one dipteran species of parasites were recovered from Rhyacionia zozana (Kearfott) larvae and pupae collected in California and Oregon. Total percentage parasitism was high, averaging 47.2% in quantitative studies. The ichneumonid wasp, Glypta zozanae Walley and Barron, was the most abundant parasite, attacking over 30% of the hosts collected. Parasitization rates were presented for each parasite species recovered. Two suspected predators, Phyllobaenus binotatus (Chapin) (Coleoptera: Cleridae) and Leptothorax sp. (Hymenoptera: Formicidae), were found in association with R. zozana cocoons. A single Aegilips sp. (Hymenoptera: Figitidae) was recovered from a host cocoon; the relation between this parasite and R. zozana is as yet undetermined. Parasite biologies were discussed.


On a recouvré 16 espèces de parasites hyménoptères et une de diptère dans des larves et des pupes de Rhyacionia zozana (Kearfott) collectées en Californie et en Oregon. Le pourcentage total de parasitisme était élevé, soit 47,2% en moyenne. La guêpe ichneumonide Glypta zozanae Walley et Barron était le parasite le plus abondant, attaquant plus de 30% des hôtes collectés. Les incidences de parasitisme sont données pour chaque espèce recouvrée. Deux présumés prédateurs, Phyllobaenus binotatus (Chapin) (Coleoptera : Cleridae) et Leptothorax sp. (Hymenoptera : Formicidae) ont été trouvés avec les cocons de R. zozana. Une seule Aegilips sp. (Hymenoptera : Figitidae) a été recouvrée d’un cocon de l’hôte; la relation entre ce parasite et R. zozana n’est pas encore établie. On discute de la biologie des parasites.

Copyright © Entomological Society of Canada 1988

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