Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

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

Abstract

Pristiphora erichsonii, a pest of Larix, and 4 parasitoids were reared in the laboratory from cocoons collected in Alaska for two consecutive years. Emergence of adults exceeded 30% each year. The number of parasitoids emerging was 4 times greater from the 1993 collection than from the subsequent year. Twelve individuals of Tritneptis klugii emerged from one cocoon of the 1993 collection. The emergence of Delomerista laevis from the same collection established a new host record. Mesoleius tenthredinis was the most common parasitoid that emerged from cocoons collected in 1993, and the only one that emerged from cocoons collected in 1994.