Abstract
During the period 2019-2020, parasitoids of invasive oak lace bug (Corythucha arcuata) were studied in Bulgaria. Biological material (larvae of C. arcuata) was collected from European oak (Quercus robur) or Austrian oak (Quercus cerris) in five localities of the country. Five eulophid specimens (Hymenoptera: Eulophidae) were reared from the host larvae: Tamarixia pubescens, Elasmus sp., Minotetrastichus sp., Pnigalio sp. and Sympiesis sp. The impact of the parasitoids on the host number was very low (0.1-0.3%). The present records in Bulgaria are the first documented case of adaptation of native parasitoids to the host in the newly occupied areas in Europe and Asia.  
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