Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Final-instar larvae of native pupal parasites and hyperparasites of Operophtera spp. (Lepidoptera: Geometridae) on southern Vancouver Island.

Abstract

The native parasites Coccygomimus hesperus [Pimpla hesperus], Buathra dorsicarinata and Cratichneumon sp. and the hyperparasites Phygadeuon sp., Villa catulina [Hemipenthes catulina] and Mastrus sp. were reared from pupae of Operophtera brumata (an important introduced pest of deciduous fruit, forest and shade trees) and O. bruceata on Vancouver Island, British Columbia, in 1981. Pimpla hesperus and Cratichneumon sp. also attacked other species of geometrids. Phygadeuon sp. and H. catulina were reared from puparia of Cyzenis spp., and Mastrus sp. was reared from Pimpla hesperus and B. dorsicarinata. The hyperparasites could have a negative impact on Cyzenis albicans and Agrypon flaveolatum (which had been introduced formerly as biological control agents). Total parasitism by pupal parasites of the Operophtera host complex was about 4%. Descriptions and illustrations of cephalic structures of final-instar larvae of the parasites and a key for their separation are given.