Context : Considered as one of the most important pest of Castanea species worldwide, the chestnut gall wasp Dryocosmus kuriphilus (Hymenoptera,Cynipidae) can induced fruit production losses from 60 to 80% (EFSA, 2010). Reported for the first time in Europe in 2002 in Italy (Brussino et al., 2002), this pest was detected in France in 2007 and is now widespread in all the main regions of chestnut production (Aquitaine, Corse, Languedoc-Roussillon, Limousin, Midi-Pyrénées, Provence-Alpes-Côte-d’Azur, Rhône-Alpes). The study : A classical biological control using the parasitoid Torymussinensis (Hymenoptera, Torymidae) has thus been implemented in France since 2010 with three main objectives : - to durably control the chestnut gall wasp populations, both in commercial orchards and in forests ; - to document the early dynamics of the introduced parasitoids ; - to document the impact of D. kuriphilusand T. sinensis on native communities. We present here some methodological aspects of this project as well as first evidences of the establishment of T. sinensis in France. Key words : chestnut tree, chestnut gall wasp Dryocosmus kuriphilus, classical biological control, parasitoid Torymus sinensis.