Abstract: [Objective]Rhodococcus turanicus (Archangelskaya) (Hemiptera:Coccidae) attacks many fruit tree species in Xinjiang and Ningxia areas, including almond, apricot, peach, apple, and pear. In order to develop non-pollution control techniques to manage the severe insect pest, a biocontrol study was carried out and the insect natural enemies were for the first time investigated.[Method] Twigs of the host tree, Cydonia oblonga (Rosaceae), with nymph and adults of the scale pest were collected, and then put in glass tube for rearing parasitic wasps. The natural enemies were gathered for taxonomic study when they emerged.[Result]A new parasitoid species, Eunotus turanicusi Yang et Kereman (Hymenoptera:Pteromalidae), was found during the survey through taxonomic study. The morphological characteristics of the new species of the parasitoid are described in detail in this paper, and the clear morphological features and color photos are provided. The basic information of its biology and distribution is also described. Meanwhile, a key to distinguish the new species from the closed species Eunotus strenus Xiao et Huang 2001 is provided. The characters below are different from the latter species:Male antenna with scape and pedicel yellow brown, but ventral half of scape luteous, flagellum dark brown. Female antenna with funicle 2 as long as broad; malar space as long as eye height; POL 3.5 times OOL; posterior ocelli attached occipital carina; fore wing with postmarginal vein 1.3 times as long as stigmal vein; metasoma with seven visible tergites and 1st tergite 0.5 times as long as gaster.[Conclusion]The present investigation has found a new parasitoid species and provides a new natural enemy for biocontrol of the pest.

Key words: Rhodococcus turanicus, insect natural enemy, parasitic wasp, Eunotus turanicusi Yang et Kereman, new species, biocontrol