Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Predispositions and symptoms of Agrilus borer attack in declining oak trees. | Ann. For. Sci. 61 2004 815-823 INRA EDP Sciences 2005 DOI forest 2004076 815 Original article Predispositions and symptoms of Agrilus borer attack in declining oak trees Dries VANSTEENKISTEa Luc TIRRYb Joris Van AcKERa Marc STEVENSa a Laboratory of Wood Biology and Technology Faculty of Agricultural and Applied Biological Sciences Ghent University Coupure Links 653 9000 Gent Belgium b Laboratory of Agrozoology Faculty of Agricultural and Applied Biological Sciences Ghent University Coupure Links 653 9000 Gent Belgium Received 13 August 2003 accepted 6 April 2004 Abstract - This paper presents results of a semi-quantitative study on the role of Agrilus biguttatus F. in oak decline in Belgium. Larvae of this insect breed in living subcortical tissues of European oak. Several factors favouring attacks are discussed among which the overall health condition and the local physical and biochemical status of the host tree. Larvae feeding galleries pupae imago and D-shaped emergence-holes of A. biguttatus were observed exclusively in declining and recently dead oaks. Attacks start in the south-facing sun-exposed parts of the subcrown stem with a preference for thicker-barked trees or similar areas within declining trees. The feeding of early larval stages induces subcortical necrosis and longitudinal bark cracking. The more destructive tunnelling of advanced larval stages cuts functional vessels and phloem elements which enhances the decline. In conclusion effects on wood quality and suitable control options are discussed. decline Quercus spp. Agrilus biguttatus F. symptoms predisposition Résumé - Predispositions et symptômes d attaques d Agrilus dans des chênes dépérissants. Nous présentons les résultats d une étude semi-quantitative portant sur le rôle du Coléoptère Agrilus biguttatus F. dans le dépérissement de chênes en Belgique. Les larves de cet insecte s attaquent au xylème et au phloème vivants. Plusieurs facteurs favorisant les attaques sont discutés. Parmi
