Abstract
In a 10 year period,Exenterus amictorius (Panzer) has become the dominant primary parasite of the introduced pine sawfly,Diprion similis (Hartig), in Wisconsin. During this time (1961–71), eleven secondary parasites have associated themselves withE. amictorius. Nine are endemic to North America and two are exotic but not of recent origin. Of these, four had never been reared previously fromD. similis cocoons; three, previously recorded as primaries, were recorded as hyperparasites; and four, previously recorded as hyperparasites, had broadened their range to includeE. amictorius. All hyperparasites are hymenopterans in the familiesPteromalidae (5),Ichneumonidae (3),Eulophidae (1),Eupelmidae (1), andTorymidae (1).
Résumé
Au cours de la décennie 1961–1971,Exenterus amictorius, est devenu le principal parasite de la TenthrèdeDiprion similis (Hartig), au Wisconsin. Onze parasites secondaires se sont associés àE. amictorius durant la même période: neufs endémiques à l'Amérique du Nord et deux introduits, mais non-récents. De ces parasites, quatre n'avaient jamais été élevés à partir deD. similis auparavant, trois reconnus autrefois comme parasites primaires se sont trouvés être des hyperparasites, et quatre décrits auparavant comme hyperparasites ont étendu leur distribution àE. amictorius. Tous les hyperparasites sont des hyménoptères appartenant aux familles suivantes:Pteromalidae (5),Ichneumonidae (3),Eulophidae (1),Eupelmidae (1), etTorymidae (1).
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Hymenoptera: Ichneumonidae
Research supported by the College of Agricultural and Life Sciences, and by the Wisconsin Department of Natural Resources through the School of Natural Resources, University of Wisconsin, Madison.
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Mertins, J.W., Coppel, H.C. Adaptation of native and exotic hyperparasites to the introduced primary sawfly parasite,Exenterus amictorius (Panzer) in Wisconsin. Entomophaga 18, 19–23 (1973). https://doi.org/10.1007/BF02373010
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DOI: https://doi.org/10.1007/BF02373010