出版社：Forestry Commission of the Hungarian Academy of Sciences
摘要：One of the most serious needle diseases that affect pines (Pinus spp.) is Dothistroma needle blight (DNB). Two species of fungi are responsible for causing this disease (Barnes et al. 2004). These are Dothistroma septosporum (teleomorph: Mycosphaerella pini) that has a worldwide distribution and infects a wide range of Pinus spp. and D. pini (teleomorph unknown), which has thus far been reported only from the North-Central U.S.A. on the non-native Pinus nigra (Barnes et al. 2004). In recent years, there have been increasing numbers of reports of DNB from new hosts and new geographic regions of the Northern Hemisphere (Bradshaw 2004, Bedná.ová et al. 2006). Moreover, there has been an increase in the intensity of this disease in some parts of Europe and North America (Koltay 2001, Aumonier 2002, Brown et al. 2003, Jankovsky et al. 2004, Woods et al. 2005). Since 2004, we have conducted surveys and inspections of trees in Austria, Bhutan, Hungary, Ukraine and South-Western Russia. These have helped to document DNB on several native and non-native pine species, and to unmask its presence in situations where disease symptoms and signs were not obvious or not typical (Barnes et al. 2007). In 2004, non-native Pinus peuce trees in an arboretum in Vienna (Austria) were found to suffer from DNB. In 2005, a non-native Pinus radiata tree in Western Bhutan was found with typical DNB symptoms. Further east in Central Bhutan, native Pinus wallichiana trees in conifer forests at high elevations, had needle blight symptoms atypical of DNB. These, and other pine needle collections from Hungary, Ukraine and South-Western Russia, with typical DNB symptoms formed the basis of this study
