tailieunhanh - Báo cáo lâm nghiệp: "Susceptibility of native French elm clones to Ophiostoma novo-ulmi"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Susceptibility of native French elm clones to Ophiostoma novo-ulmi" | Ann. For. Sci. 62 2005 689-696 INRA EDP Sciences 2005 DOI forest 2005066 689 Original article Susceptibility of native French elm clones to Ophiostoma novo-ulmi Jean PINONa Claude HUSSONa Eric COLLINb a UR Pathologie forestière INRA 54280 Champenoux France b UR Écosystèmes forestiers Cemagref Domaine des Barres 45290 Nogent-sur-Vernisson France Received 7 June 2004 accepted 24 January 2005 Abstract - More than 200 clones from native European elm species U. minor U. glabra and their hybrids and U. laevis were inoculated with Ophiostoma novo-ulmi in comparison with some cultivars on two sites under six inoculation series. Crown wilt and defoliation percentage was assessed in the inoculation year and subsequent recovery and mortality were also recorded. Multiple comparisons indicated that the results were reproducible. Species effect was generally detected U. glabra being more susceptible than the other native species. Clone effect was always very significant with a wide symptom amplitude between clones particularly among U. minor. In the case of U. laevis some clones suffered high mortality rates whereas other showed a strong recovery ability. Clones with a good behaviour could be identified among each species. Some of them showed complete recovery the year following inoculation. No effect of taxa and geographic origin was detected in the frequency of superior clones. Because no native elm clone reached the level of resistance of the best cultivars Sapporo Autumn Gold and LUTECE Nanguen their cultivation in pure stand is not recommended. However the best clones can be introduced in multi-species plantations especially for the reconstruction of countryside hedges they may also contribute to a breeding programme. Ulmus species clone susceptibility Ophiostoma novo-ulmi Résumé - Sensibilité envers Ophiostoma novo-ulmi de clones d orme d origine franẹaise. Plus de 200 clones d ormes indigènes en Europe U. minor U. glabra et leurs hybrides et U. laevis ont été .