Die Eiparasitierung von Fichtengespinstblattwespen (Cephalcia Panzer) im Erzgebirge 1981-1983.

Abstract

During a mass increase of spruce sawflies (Cephalcia Panzer) in the Erzgebirge from 1981 to 1983, Trichogramma cephalciae Hochmut & Martinek, T. zeirapherae Walter and T. embryophagum (Hartig) were found as egg parasites. Both the degree of parasitization and the shares of the various species differed from year to year. Problems of the biology of T. cephalcia and T. zeirapherae are discussed in connection with their efficacy as parasites of Cephalcia.