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Distribution, species composition, and incidence of egg parasitoids of the forest tent caterpillar (Lepidoptera: Lasiocampidae), during a widespread outbreak in the Canadian prairies

Published online by Cambridge University Press:  03 January 2012

Daryl J. Williams  and
David W. Langor
Daryl J. Williams*
Affiliation:
Northern Forestry Centre, Canadian Forest Service, Natural Resources Canada 5320-122 Street NW, Edmonton, Alberta, Canada T6H 4S7
David W. Langor
Affiliation:
Northern Forestry Centre, Canadian Forest Service, Natural Resources Canada 5320-122 Street NW, Edmonton, Alberta, Canada T6H 4S7
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Egg bands of the forest tent caterpillar, Malacosoma disstria Hübner, were sampled across a wide area of the Canadian prairie provinces during a large-scale outbreak in 1989 and 1990 to examine the incidence and distribution of egg parasitoids (Hymenoptera). Data on the parasitoid species found and the incidence and frequency of parasitism in three habitat types is presented. Three species of egg parasitoids were recovered, Telenomus clisiocampae Riley (Scelionidae), Ooencyrtus clisiocampae (Ashmead) (Encyrtidae), and Baryscapus malacosomae (Girault) (Eulophidae). Differences in the number of species occurring per egg band and the percent of parasitism were found among habitat types. These differences are correlated to the amount of spumaline cover on egg bands, which also varied among habitat types.

Résumé

Des échantillons de bandes d'œufs de la livrée des forêts, Malacosoma disstria Hübner, prélevés sur un large territoire dans les provinces canadiennes des Prairies durant une épidémie de grande envergure en 1989 et 1990 ont servi à déterminer l'incidence et la répartition des parasitoïdes (Hymenoptera) des œufs. Nous présentons les données sur les espèces de parasitoïdes retrouvées et sur l'incidence et la répartition du parasitisme dans trois types d'habitats. Trois espèces de parasitoïdes des œufs sont présentes, Telenomus clisiocampae Riley (Scelionidae), Ooencyrtus clisiocampae (Ashmead) (Encyrtidae) et Baryscapus malacosomae (Girault) (Eulophidae). Il existe des différences dans le nombre d'espèces par bande d'œufs et le % de parasitisme en fonction des types d'habitats. Ces différences sont en corrélation avec la quantité de spumaline qui recouvre les bandes d'œufs, qui varie aussi selon les types d'habitats.

[Traduit par la Rédaction]

Type
Biodiversity & Evolution
Information
The Canadian Entomologist , Volume 143 , Issue 3 , June 2011 , pp. 272 - 278
Copyright
Copyright © Entomological Society of Canada 2011

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