BIOLOGIE ET PHYLOGEOGRAPHIE DE MONOCHAMUS GALLOPROVINCIALIS (COLEOPTERA, CERAMBYCIDAE) VECTEUR DU NEMATODE DU PIN EN EUROPE

Abstract : In Portugal where he has recently been introduced accidentally, the phytopathogenic invasive nematode Bursaphelenhus xylophilus is transported and transmitted to host trees (Pinus pinaster) by his indigenous vector Monochamus galloprovincialis. In order to evaluate the risks of invasion and propagation in France and in the rest of Europe, a detailed study on the biology and ecology of the vector M. galloprovincialis, was conducted in this country, in parallel with a study on the genetic and morphological variability of his populations and those of his sister species M. sutor. It was shown that M. galloprovincialis, present in every French forest land, has four larval instars that were described. Fecundity, larval instars' duration and longevity were measured. The existence of a diapause in the fourth larval instar was observed and had as result a synchronisation of the adults' emergence; a prolonged diapause seems to exist for a small section of the population. The larval development can be affected by various factors, as the breeding log dimensions. M. galloprovincialis showed a preference for Pinus sylvestris, but it can develop on other Pinus species as well namely P. pinaster, major host in the South West regions. It seems that climatic conditions have more important role in the distribution of this insect than the host tree. This was confirmed by the molecular study. Genetic and morphological proximity was evident by twelve polymorphic sites of the cytochrome oxydase I and four morphological characters, three of which correspond to male genitalia characters. The totality of the results demonstrated that a great number of factors favourable to the propagation of the nematode are gathered in France.
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Koutroumpa Fotini. BIOLOGIE ET PHYLOGEOGRAPHIE DE MONOCHAMUS GALLOPROVINCIALIS (COLEOPTERA, CERAMBYCIDAE) VECTEUR DU NEMATODE DU PIN EN EUROPE. Interactions entre organismes. Université d'Orléans, 2007. Français. ⟨tel-00288604⟩

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