Larch sawfly, Pristiphora erichsonii (Hymenoptera: Tenthredinidae) and its parasitoids from Alaska

James A. Richmond, Richard A. Werner, Arnold T. Drooz


The larch sawfly and four parasitoids were reared in the laboratory from cocoons collected in Alaska for two consecutive years. Emergence of adult sawflies exceeded thirty percent each year. The number of parasitoids emerging was four times greater from the 1993 collection than from the subsequent year. Twelve Tritneptis klugii (Ratzeburg) emerged from one cocoon of the 1993 collection. The emergence of Delomerista laevis (Gravehorst) from the same collection established a new host record. Mesoleius tenthredinis Morley was the most common parasitoid that emerged from cocoons collected in 1993, and the only one that emerged from cocoons collected in 1994.

Key words: Rearing; sawfly; Tachinidae; Ichneumonidae; Pteromalidae

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