Eur. J. Entomol. 112 (4): 698-704, 2015 | 10.14411/eje.2015.091

Invasive chestnut gall wasp Dryocosmus kuriphilus (Hymenoptera: Cynipidae), its native parasitoid community and association with oak gall wasps in Slovenia

Katarina KOS1, Eva KRISTON2, George MELIKA2
1 Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia; e-mail: katarina.kos@bf.uni-lj.si
2 Plant Health and Molecular Biology Laboratory, National Food Chain Safety Office, Budapest, Hungary; e-mails: kristone@nebih.gov.hu; melikageorge@gmail.com

The Asian chestnut gall wasp (ACGW), Dryocosmus kuriphilus Yasumatsu (Hymenoptera: Cynipidae), is a global pest of chestnut trees. This pest was first recorded in Slovenia in 2005. Despite strict phytosanitary measures it was present throughout the country in native chestnut stands by 2013. We provide here the first overview of the parasitoids of ACGW in Slovenia recorded over a 4-year period and the direct interactions between parasitoid communities attacking hosts on chestnut and oaks at the same sites. A total of 27 species of native parasitoids that normally parasitize oak cynipids emerged from ACGW galls. The most abundant species were Torymus flavipes and Eupelmus urozonus. Seven species appear to be geographically well distributed in Slovenia. Twelve species of oak gall wasp were parasitized by 19 species of parasitoids. All native parasitoids have broad host ranges, so a large parasitoid diversity within this community can be expected. This is a novel study comparing the parasitoid communities associated with chestnut and oak galls.

Keywords: Hymenoptera, Cynipidae, Dryocosmus kuriphilus, ACGW - Asian chestnut galls wasp, oak cynipids, parasitoid recruitment, native fauna, Slovenia

Received: May 21, 2015; Accepted: July 24, 2015; Prepublished online: August 27, 2015; Published: November 21, 2015

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