The paper analyzes the biocenoses parasitizing the main harmful curculionidae of the Apio and Sitona species on the trefoil species (clover and lucerne/Spanish trefoil) cultivated over the territory of Moldavia. The most important parasite species of the Braconidae and Chalcididae families are presented, along with their spreading in Moldavia, and the average parasitic ratios over long periods of time. The study aims at evidencing the fact the parasitic species from the biocenoses have a continuous dynamics, and that some species restrict their areal while others extend it, thus becoming dominant. Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Land zones; Palaearctic region; Eurasia; Europe Curculionidae; Hymenopteran parasites; Braconidae & Chalcididae; Parasitic prevalence & biocenoses; Plant hosts; Trefoil; Romania; Moldova; Hymenopteran parasite prevalence & biocenoses Braconidae; Chalcididae; Coleopteran hosts; Curculionidae; Romania; Moldova; Parasite prevalence & biocenoses none2004