First Record of Biocontrol Agent Torymus sinensis (Hymenoptera; Torymidae) in Bosnia and Herzegovina

Matošević, Dinka; Mujezinović, Osman; Dautbašić, Mirza

doi:10.15177/seefor.17-14

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(1 citation statement)

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“…Consequently, T. sinensis is now widespread in Europe, as a consequence of both the national release programmes and natural dispersal. For instance, in Switzerland (Gehring et al, 2018) and in Bosnia and Herzegovina (Matošević et al, 2017) the parasitoid has been recorded without being officially released. In the Asian area of origin, T. sinensis is considered a host‐specific parasitoid, and although occasional feeding on European native oak‐cynipid gall‐inducers has been recorded in Italy (Ferracini et al, 2015, 2017), the direct impact on non‐target species is considered low.…”

Section: Introductionmentioning

confidence: 99%

No loss of genetic divergence in Torymus sinensis following its release for Dryocosmus kuriphilus control in Europe

Avtzis¹,

Eleftheriadou²,

Matošević

et al. 2023

Agri and Forest Entomology

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Arrival, establishment, and further dispersal of non‐native natural enemies are considered essential for a successful biological control programme, while among the factors that may determine the success of such a programme, genetic diversity of the introduced population plays an important role in the establishment of a non‐native species. The Chinese parasitoid wasp Torymus sinensis Kamijo (Hymenoptera: Torymidae) was initially released in Europe in Italy to control biologically the Asian chestnut gall wasp Dryocosmus kuriphilus Yasumatsu (Hymenoptera: Cynipidae), and reduce the damage induced on sweet chestnut (Castanea sativa Miller). In the following years, T. sinensis was then released in numerous other European countries as a biological control agent of D. kuriphilus. Its presence has also been reported beyond the countries of release due to rapid natural dispersal. To assess the post‐release genetic diversity of D. kuriphilus, we screened T. sinensis populations from six European countries and tested the possibility of these populations suffering from frequently observed genetic effects that could threaten its successful establishment in Europe. Our results exhibit that T. sinensis populations have suffered neither from the Allee effect nor from genetic bottleneck after their release and establishment in Europe, something that increases the possibility to effectively control D. kuriphilus in Europe.

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