The Influence of Parasitoids (Hymenoptera, Eulophidae) on Survival of the Lime Leafminer Phyllonorycter issikii (Lepidoptera, Gracillariidae) in Udmurtia

Abstract

The species structure of parasitoids (Hymenoptera, Eulophidae) of the invasive lime leafminer Phyllonorycter issikii (Kumata, 1963) (Lepidoptera, Gracillariidae) was reexamined ten years after the latest survey. The work was carried out in 2015 in three previously selected test plots within the city of Izhevsk. Extremely high survival rates (61.7 to 89%) of the leafminer were observed while the parasitoid complex had a negligible impact on its mortality (0.6 to 1.6%). A slight structural transformation of the parasitoid complex was noted, namely a decrease in the number of dominants and a change of the dominant species. In addition, the species structure of the parasitoids collected in 22 populated localities in Udmurtia was studied in 2016. Five new parasitoids of the lime leafminer were found: Pnigalio pectinicornis (Linnaeus, 1758), Sympiesis acalle Walker, 1848, Chrysocharis amanus Walker, 1839, Ch. pentheus Walker, 1839, and Ch. polyzo Walker, 1839. Two species of parasitoids of Ph. issikii were recognized as new to Udmurtia: Pnigalio agraules (Walker, 1839) and Pediobius saulius (Walker, 1839).