The invasive chestnut gall wasp Dryocosmus kuriphilus Yasumatsu (Hymenoptera: Cynipidae) is a major pest species of Castanea spp. worldwide. It only arrived in Britain in 2015 and the parasitoid community associated with it was studied in 2019. Eight native species of
chalcidoid, previously known to be associated with oak gall wasps, were identified. These results are compared to a similar study (2016–2019) in France where four parasitoids were reared. However, this community included the deliberately introduced Torymus sinensis Kamijo, a specific
biological control agent of D. kuriphilus. The presence of T. sinensis and the differences between the two communities is discussed.
Extreme climatic events affect populations of Asian chestnut gall wasps,
Dryocosmus kuriphilus
, but do not stop the spread
