I. NIKOLOVA, N. GEORGIEVA
Abstract. In 2007-2010 period was studiedthe quantitativeand qualitative composition of sucking pests from Homoptera–AuchenorrhynchaandThysanopterainwinter vetch agrocenosis in the conditions of Pleven region as well as the numerical dynamics of the most economicallyimportantspecies of them. For Pleven region in winter vetch from Homopteraorder, Auchenorrhynchawere established cicadas belonging to 5 families, 14 genera и 14 species. Economic importance for winter vetch had Empoasca pteridiswhich was found from the beginning of May to the harvesting of culture as its density increased in the reproductive stages of vetch flowering and beginning seed fillwith maximum in the beginning of July. FromThysanopteraorder was foundtripswhichbelonged to 3 families with 6 species. Asimportantpestswere outlined Thrips tabaci (53.6%), Taeniothrips atratus (15.6%) andOdontothrips confusus (15.0%).The density of Thrips tabaci increased in May and reached the highest values in the first decade of June as Taeniothrips atratus andOdontothrips confususwerein higher density from the second half of May to the middle of June. To useful species relatedAeolothrips intermedius which because of its high consumptive ability of predatory might control the density of harmful trips in determinate numbers and to contribute for decrease of their density.