First Molecular Evidence of Ixodiphagus hookeri (Hymenoptera: Encyrtidae) in Ixodes ricinus and Haemaphysalis concinna (Acari: Ixodida) Ticks from Inland and Coastal Areas of the Balkan Peninsula
2025
Veronika Blažeková | Michal Stanko | Dana Zubriková | Lucia Vargová | Klaudia Mária Švirlochová | Bronislava Víchová
Ixodiphagus hookeri (Howard, 1907) (Hymenoptera: Encyrtidae), a hyperparasitic wasp that parasitizes hard ticks, has been documented in various parts of Europe: however, data on its presence in southeastern regions has been lacking. This study provides the first molecular evidence of I. hookeri in ticks from the coastal areas of the Balkan Peninsula, specifically Croatia and Bulgaria. A total of 1043 questing ticks were collected between 2011 and 2013 across 15 locations. Molecular screening revealed I. hookeri DNA in Ixodes ricinus (Linnaeus, 1758) (Acari: Ixodidae) nymphs from inland Croatia (overall prevalence: 18.72%) and in Haemaphysalis concinna (Koch, 1844) (Acari: Ixodidae) nymphs and larvae from coastal Bulgaria (prevalence: 17.2%). All I. hookeri-positive samples were co-infected with Wolbachia spp. (Rickettsiales: Anaplasmataceae). This detection marks the southernmost record of I. hookeri in Central Europe, expanding its known range to the Balkan Peninsula and supporting its relevance as a potential natural enemy in integrated tick management strategies.
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