Die blaue HolzwespeSirex cyaneus F. (Hym., Siricidae) und der TannendüsterkäferSerropalpus barbatus Schall. (Coleoptera,Serropalpidae) als technische Holzschädlinge an Tannen in Südtirol

In the summer of 1983 dead firs were found near Kaltern, South Tyrol, Italy attacked heavily bySirex cyaneus (60%) andSerropalpus barbatus (40%). The slipping holes of both species were identical. The numerous relation between females and males ofS. cynaea was 1∶10. About 26% of this species were parasitized byIbalia leucospoides Hoch. (Cynip., Ibaliidae).Sirex cyaneus andSerropalpus barbatus must be considered as important wood destroyers of silver firs.