Effect of nutrition of parasites with nectar of melliferous plants on parasitism of the elm bark beetles (Col., Scolytidae)

In the forest of Kljestevica. the elm is attacked by four species of elm ba rk beetles: Scolytus multistriatus (Marsh.), Scolytus scolytus (Fab.), Scol ytus pygmaeus (Fab.) and Scolytus ensifer (Rich.) (Col., Scolytidae). Scoly tus multistriatus and S. pygmaeus are the most numerous species. Elm bark b eetle is parasitized by four species of parasites: Dendrosoter protuberans (Nees), Ecphylus silesiacus (Ratz.), Coeloides scolyticida (Wesm.) (Hym., B raconidae) and Entedon leucogramma (Ratz.) (Hym., Eulophidae). Ecphylus sil esiacus and D. protuberans are the most numerous species. The nectar of mus tard (Sinapis alba L., Brassicaceae) flowers, sweet basil (Stachys recta L. , Lamiaceae) flowers and of wild carrot (Daucus carota L., Umbelliferae), h as an important effect on the number of parasites and on the parasitism of the elm bark beetles. Wild carrot is the most attractive plant to the paras ites for additional nutrition, especially for D. protuberans. Mustard and s weet basil Bowers are suitable for additional nutrition of E. silesiacus im ages. On meadow flowers growing spontaneously in forest clearings, the lowe st number of parasite images was collected by an entomological catcher, and the lowest percentage of parasitized larvae and eggs of the elm bark beetl e was recorded in elm control catch trunks that were not near the cultivate d melliferous plants.