New Ichneumonidae (Hymenoptera) parasitoids of forest insect pests in Bulgaria

1999

S. 57-61

1 Tab., 34 Lit. Ang.

Unselbständiges Werk

200080499

During the period 1989-1998 investigations were carried out on the parasitoids of some forest insect pests in Bulgaria. Twenty-one ichneumonid species are reported for the first time in Bulgaria as parasitoids of different coleopteran, lepidopteran, and hymenopteran hosts. From these, 6 parasitoids are new records for the parasitoid complexes of the hosts: Exochus decoratus Holmgr. on Eudemis profundana (Den. & Schiff.) and Gelechia turpella (Den. & Schiff.); Lissonota culiciformis Grav.-on Paranthrene tabaniformis (Rott.); Lissonota unicincta Holmgr.-on G. turpella; Xorides gracilicornis (Grav.)-on Xylotrechus sp.; and Eriborus terebrator Aubert - on Clostera anastomosis (L.). Most parasitoids deveoped as primary parasitoids in the hosts. Itoplectis alternans (Grav.) is a primary parasitoid of Nycteola asiatica (Krul.) and a hyperparasitoid of E. terebrator. Acropimpla pictipes (Grav.) is secondary parasitoid on Anacampsis populella (Cl.). With the exeption of two species of Olesicampe genus, which destroyed over 50% of Stauronematus compressicornis (F.) and Pristophora conjugata (Dahlm.) Larvae, and E. terebrator which killed 15.4% of C. anastomosis population, the rest of the parasitoids occurred in low densities, and did not play an important role in reducing the number of their hosts.