Parasitoid complex of Stereonychus fraxini (De Geer) (Coleoptera, Curculionidae) in Serbia

Abstract

The parasitoid complex of the ash weevil Stereonychus fraxini (De Geer) (Coleoptera, Curculionidae) from 20 localities in Serbia was studied. Forty-one samples of ash weevil larvae and cocoons were analyzed, and the presence of parasitoids was confirmed in 24 samples. Ten species of hymenopteran parasitoids (Hymenoptera Parasitica) were recorded. The two common eulophid wasps, Entedon zanara Walker and Entedon cionobius Thompson, were the most abundant. Parasitoids had an insignificant influence on the level of ash weevil population, because the level of infestation did not exceed 20% in 83% of the samples; however infestation above 40% was determined in 12.2% of the samples, indicating that in some cases parasitoids may significantly reduce the ash weevil population.