Parasitoid wasps and their influence on forest pest populations

Abstract

Parasitoid wasps are very important in reducingpopulations of little spruce sawfly (Pristiphora abietina Christ.), yearly percent of affected cocoons being between 23 and 35,2%. In laboratory conditions, 23% from the monitoredcocoons was affected by parasitoidwasps, the largest sharebeing owned byichneumonids (19%).Was identified 2 new species of ichneumonids forRomania fauna (Mesoleius ruficollis Holmgren and Ctenochira flavicauda Roman).It is necessary to be made researches in this domain, to know better the parasitoid complex and the significant importancein pest controland the protective measureswhich must be adopted by the forest management.