Abstract
In 2020, five eurytomid species were found for first time on bark beetles in Pinus sylvestris plantations in Ihtimanska Sredna Gora Mountains in Bulgaria: Eurytoma afra Boheman, 1836, Eurytoma arctica Thomson, 1875, Eurytoma morio Boheman, 1836, Eurytoma sp.1 and Eurytoma sp.2. One of them, E. arctica is a new species for the Bulgarian fauna. The parasitoids were reared from stem and branch samples infested by Ips acuminatus, Pityogenes bistridentatus, Pityophthorus pityographus, Tomicus piniperda and T. minor. All host-parasitoid associations are new for Bulgaria. In parasitoid complex, the most abundant species was E. morio (75.9%), followed by E. arctica (13.8%), Eurytoma sp. (6.9%) and E. afra (3.4%). The parasitism of the hosts varied between 2.6% (E. afra on I. acuminatus, P. bistridentatus and P. pityographus) and 33.3% (E. morio on I. acuminatus).
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