The parasitoid complex of Scolytus rugulosus Muller includes 11 species of six families of Hymenoptera: Doryctes pomarius Reinhard, Dendrosoter protuberans Ness., Spathius brevicaudis Ratzeburg, Ecphylus silesiacus Ratzeburg (Braconidae), Eurytoma morio Boheman (Eurytomidae), Cheiropachus quadrum F., Rhaphitelus maculatus Walker (Pteromalidae), Calosota aestivalis Curtis (Eupelmidae), Tetrastichus ulmi Erdos, Entedon ergias Walker (Eulophidae), Scleroderma domesticus Klug (Bethylidae). Among the abovementioned parasitoids, the species Rhaphitelus maculatus had the greatest influence on S. rugulosus abundance. It was identified in 73.7% of examined samples, its average domination was 53.7%, and average percent of S. rugulosus parasitism was 23.9%. Besides, the species Ecphylus silesiacus, Cheiropachus quadrum, Entedon ergias and Eurytoma morio had a strong effect on S. rugulosus abundance. The significance of other parasitoids was low. Parasitoids have a great influence on the abundance of S. rugulosus because they reduce the abundance of their host 44.5% on average. Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Ecology; Community structure; Population dynamics; Land and freshwater zones; Palaearctic region; Europe Scolytus rugulosus (Curculionidae); Hymenopteran parasites; Parasite species diversity; Population regulation; Serbia and Montenegro; Hymenopteran parasite records, parasite diversity, prevalence & impacts on host populations Hymenoptera; Coleopteran hosts; Scolytus rugulosus; Host records; Species diversity; Parasitoids of coleopteran host; Serbia and Montenegro; Coleopteran host records, parasite species diversity, prevalence & impacts on host populations none