First Detection of Deformed Wing Virus (DWV) and Acute Bee Paralysis Virus (ABPV) in Central Hungary in European Hornet (Vespa crabro Linnaeus, 1758)

This study aimed to investigate the presence of known bee viruses in the European hornet (<i>Vespa crabro</i>, Linnaeus, 1758), a species recognized as a bee predator in Hungary. Several viruses affecting honeybees (<i>Apis mellifera</i>, Linnaeus, 1758), such as deformed wing virus (DWV), sacbrood virus (SBV), chronic bee paralysis virus (CBPV), and acute bee paralysis virus (ABPV), have been documented in various wasp species. For instance, DWV has been frequently isolated in <i>Vespa orientalis</i> (Linnaeus, 1761), and ABPV has been detected in <i>V. orientalis</i>. Additionally, viruses like Kashmir bee virus (KBV) and Black queen cell virus (BQCV) have been confirmed in other wasp species such as <i>Vespula germanica</i> and <i>Vespa velutina</i>. Despite this, data on virus presence in <i>V. crabro</i> remain limited. Between August and October 2023, we tested 40 adult <i>V. crabro</i> workers, collected from Kiskunlacháza and Vácduka, for viral infections using polymerase chain reaction (PCR). Our results confirmed the presence of genetic material from DWV and ABPV infection in adult workers of the European hornet, which showed no morphological alterations. This study provides the first detection of DWV (in Hungary) and ABPV in <i>V. crabro</i>, contributing to our understanding of virus transmission pathways in wasp species and their potential impact on bee populations.