TAILIEUCHUNG - Báo cáo lâm nghiệp: "Observations on Armillaria occurrence in declining oak woods of southern Italy"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài:"Observations on Armillaria occurrence in declining oak woods of southern Italy. | Ann Sci For 1996 53 389-394 Elsevier INRA 389 Original article Observations on Armillaria occurrence in declining oak woods of southern Italy N Luisi G Sicoli p Lerario Dipartimento di Patologia vegetale Università degli Studi via G Amendola 165 A 70126 Bari Italy Received 6 September 1994 accepted 18 July 1995 Summary The fungi of Armillaria genus have generally been recognized as being among the most important biotic causes of oak decline in the world. In order to assess which Armillaria species predominates on declining oaks in southern Italy further surveys were carried out in numerous oak woods and additional Armillaria isolates were collected. Their identification was based on the characteristics of the diploid cultures obtained from infected roots and woody tissues on haploid-haploid pairings with tester isolates and on the main features of the basidiomes. Most of the collected isolates were found to belong to A gallica while A mellea and A tabescens were observed to occur less frequently. These observations conflict with previous surveys which considered A mellea as the most frequent Armillaria species in southern Italy. The fact that A gallica was found to be particularly widespread in the most seriously declining oak woods could confirm the opportunistic behaviour of Armillaria and suggest that it may depend on the remarkable weakness of the oak trees in very unfavourable site conditions. Armillaria root disease oak decline Quercus southern Italy Resume Observations sur la presence d armillaire dans les chênaies dépérissantes du sud de ritalie. Les champignons du genre Armillaria sont généralement consldérés comme figurant parmi les plus importantes causes biotiques du dépérissement des chênes dans le monde. Dans le but d etablir I importance relative des differentes espèces d Armillaria dans les chênaies du sud de I ltalie on a procédé à la récolte d isolats de ces champignons dans de nombreuses chênaies fig 1 . L iden-tification des isolats a été basée

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