Evolutionary Applications (2012) 5, 256-269

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Antonio Hernández-López, Rodolphe Rougerie, Sylvie Augustin, David C. Lees, Rumen Tomov, Marc Kenis, Ejup Çota, Endrit Kullaj, Christer Hansson, Giselher Grabenweger, Alain Roques and Carlos López-Vaamonde (2012)
Host tracking or cryptic adaptation? Phylogeography of Pediobius saulius (Hymenoptera, Eulophidae), a parasitoid of the highly invasive horse-chestnut leafminer
Evolutionary Applications 5 (3), 256-269
Abstract: Classical biological control is often advocated as a tool for managing invasive species. However, accurate evaluations of parasitoid species complexes and assessment of host specificity are impeded by the lack of morphological variation. Here, we study the possibility of host races/species within the eulophid wasp Pediobius saulius, a pupal generalist parasitoid that parasitize the highly invasive horse-chestnut leaf-mining moth Cameraria ohridella. We analysed the population genetic structure, host associations and phylogeographic patterns of P. saulius in Europe using the COI mitochondrial gene. This marker strongly supports a division into at least five highly differentiated parasitoid complexes, within two of which clades with differing degrees of host specialization were found: a Balkan clade that mainly (but not only) attacks C. ohridella and a more generalist European group that attacks many hosts, including C. ohridella. The divergence in COI (up to 7.6%) suggests the existence of cryptic species, although this is neither confirmed by nuclear divergence nor morphology. We do not find evidence of host tracking. The higher parasitism rates observed in the Balkans and the scarcity of the Balkan-Cameraria haplotypes out of the Balkans open the possibility of using these Balkan haplotypes as biological control agents of C. ohridella elsewhere in Europe.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: English)
Full text of article
Database assignments for author(s): Marc Kenis, Giselher Grabenweger, Alain Roques, Carlos Lopez-Vaamonde, Ejup Çota

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
molecular biology - genes

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Cameraria ohridella Horse-chestnut/buckeye (Aesculus)
Phyllonorycter quercifoliella Oak (Quercus)
Phyllonorycter platani Plane tree/sycamore (Platanus)
Pediobius saulius (parasitoid) Albania
Pediobius saulius (parasitoid) Austria
Pediobius saulius (parasitoid) Bulgaria
Pediobius saulius (parasitoid) Czech Republic
Pediobius saulius (parasitoid) Greece
Pediobius saulius (parasitoid) North Macedonia
Pediobius saulius (parasitoid) Spain (continental)
Pediobius saulius (parasitoid) Switzerland
Pediobius saulius (parasitoid) Cameraria ohridella Horse-chestnut/buckeye (Aesculus) France
Pediobius saulius (parasitoid) Phyllonorycter quercifoliella Oak (Quercus)
Pediobius saulius (parasitoid) Phyllonorycter platani Plane tree/sycamore (Platanus)