The article communicates about the role of the entomological-practical collection in the truthful diagnosis of the species of parasites and predators noted in the cultures of nectariferous and sidereal plants, cultivated in mix or solitary, in the plum culture. Cultivation between plum rows of more than 6 solitary nectariferous plant cultures and 3 mixes (of which 2 standard) revealed a rather varied complex of parasites of harmful carpophagous moths. Two crops Lobullaria maritima L. and Gypsofila paniculata L. demonstrated long flowering periods from May until the first frost (November-December).