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Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: Variations clonales de l’aptitude du pin sylvestre à assurer le développement de Diprion pini L (Hym, Diprionidae) en milieu naturel. | 705 Ann Sci For 1997 54 705-713 Elsevier Inra Article original Variations clonales de 1 aptitude du pin Sylvestre à assurer le développement de Diprion pini L Hym Diprionidae en milieu naturel MA Auger-Rozenberg c Géri F Goussard Station de zoologie forestiere Inra 45160 Ardon France Reụu le 23 septembre 1996 accepté le 25 juin 1997 Summary - Influence of some Scots pine clones on Diprion pint L Hym Diprionidae development. Noxious effect in field. The study attempts to confirm in nature the noxious effect of some Scots pine clones from Polish origin on Diprion pint. Up to now this noxiousness has only been proved in standard laboratory conditions by feeding the insects with cut pine shoots. Because significant natural populations were lacking during recent years the first experiments were carried out in 1991 1992 and 1993 with larvae issued from a permanent rearing strain of D pint. These larvae were transferred to tree collections of Orleans and Cadouin in Dordogne France and put on several vegetative copies of different Scots pine clones. These tests encountered many difficulties due to the weakness of the laboratory strain in natural climatic conditions the lack of synchronization between reared insect and natural insect generations the natural parasites and the distance between the lab and Cadouin. On the other hand the real aptitudes of the clones in situ may only be proved during a real outbreak of the sawfly. However an earlier mortality and a slower development are clearly shown when the insects develop on clones previously noted as unfavorable to D pint in laboratory bioassays. Scots pine Diprion pint pine sawfly noxious clones natural conditions Resume - L etude tend à confirmer sur le terrain la nocivité pour Diprion pint de clones de pin Sylvestre de provenance polonaise jusqu a present testée seulement en conditions standard au laboratoire en nourrissant finsecte avec des rameaux coupes. Du fait de 1 absence de populations naturelies importantes au .
