tailieunhanh - Báo cáo khoa học: "Blue-stain fungi associated with Tomicus piniperda in Sweden and preliminary observations on their pathogenicity"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Blue-stain fungi associated with Tomicus piniperda in Sweden and preliminary observations on their pathogenicity. | Ann Sá For 1991 48 149-156 Elsevier INRA 149 Original article Blue-Stain fungi associated with Tomicus piniperda in Sweden and preliminary observations on their pathogenicity H Solheim 1 B Lángstrõm 2 1 Norwegian Forest Research Institute Section of Forest Ecology Division of Forest Pathology PO Box 61 N-1432 ẢS-NLH Norway 2 Swedish University of Agricultural Sciences Division of Forest Entomology S-770 73 Garpenberg Sweden Received 9 July 1990 accepted 13 November 1990 Summary Mass attacks by Tomicus piniperda were induced in young Scots pines of varying vitality by baiting the trees with split fresh pine bolts. Trees were felled at different times to determine the development of blue-staining of sapwood Fungi were isolated from samples of inner bark and blue-stained sapwood in connection with galleries of T piniperda. Samples were also taken from beetle-attacked pine timber. In addition 4 stem-pruned trees were inoculated with the 2 most important species isolated from trees attacked by Tpiniperda. Three species of fungi were rather frequently isolated Hormonema dematioides Leptographium wingfieldii and Ophiostoma minus. The latter 2 species were most active in invading the sapwood. Blue-Staining of sapwood occurred rather late in the season 1-2 months after attack. One tree in each pair of trees inoculated with L wingfieldii and o minus were dying when harvested more than 4 months after mass inoculation. Thus these fungi may play a role in overcoming the resistance of trees under beetle attack. blue-stain fungi I Tomicus pinlperda I Plnus sylvestrisl insect-fungus relationship I pathogenicity Résumé Champignons du bleuissement associés à Tomlcus plnìperda en Suède et observations préllmlnaires sur leur pathogénlclté. Des attaques massives de Tomicus piniperda ont étó provoqudes sur desjeunes pins Sylvestres de vitalitd variée en appâtant les insectes avec des fragments de rondins de pin frais. Les arbres ont dtd abattus à diffdrentes dates pour suivre le .