tailieunhanh - Báo cáo lâm nghiệp: " Modelling the influence of winter frosts the development of the stem canker of red oak, caused by Phytophthora cinnamomi"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: " Modelling the influence of winter frosts the development of the stem canker of red oak, caused by Phytophthora cinnamomi. | Ann Sci For 1996 53 369-382 Elsevier INRA 369 Original article Modelling the influence of winter frosts on the development of the stem canker of red oak caused by Phytophthora cinnamomi B Marẹais 1 F Dupuis 2 ML Desprez-Loustau 2 1 Laboratoire de pathologie forestiere Centre de Nancy Inra 54280 Champenoux 2 Laboratoire de pathologic forestiere Centre de Bordeaux Inra 71 av É-Bourleaux BP 81 33883 Villenave-d Ornon cedex France Received 14 November 1994 accepted 21 June 1995 Summary The evolution of trunk cankers induced by Phytophthora cinnamomi over a period of about 25-30 years was studied by a dendrochronological method on 20 Quercus rubra trees located in four plots in southwest France. In plots as far from each other as 150 km AEị the annual evolution of the cankers presented similar trends with enlargement or reduction of the cankers occurring in the same years. This suggests a strong influence of climatic conditions on the disease development. A model describing the influence of winter frost on the evolution of the cankers was developed. This model predicted the AEị well. No trace of p cinnamomi lesions could be found in the growth ring of an individual tree in years for which the model predicted total elimination of the fungus. Moreover the amount of lesions induced by p cinnamomi on the trees studied usually decreased in years for which the model predicted poor survival of the fungus. Quercus rubra I Phytophthora cinnamomi frost model canker winter survival Resume Modélisation de I influence des gelées hivernales sur le développement de I encre de chêne rouge causée par Phytophthora cinnamomi. Phytophthora cinnamomi esf I agent de I encre du chêne rouge Quercus rubra. La maladie se manifesto parun chancre surla partie basse du tronc. Par methode dendrochronologique nous avons étudié le développement du chancre sur 20 arbres situés dans le sud-ouest de la France sur une période de 25-30 ans. Dans des sites éloignés les uns des autres Pyrénées-Atlantiques .