Leucostoma niveum. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Leucostoma niveum. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Leucostoma niveum, especially its anamorph, is a quite common pathogen of Populus, colonizing bark of trees weakened by other factors and causing necrosis (poplar canker) of twigs and branches. Another pathogen, Valsa sordida, can be also found in the same tree. Both species may be involved in pathogenesis (Wang, 1988). HOSTS: On dead or dying, attached or fallen twigs of Populus, also on similar substrata of Alnus, Betula, Carpinus, Salix and Sorbus. GEOGRAPHICAL DISTRIBUTION: Asia: Armenia, China, Republic of Georgia, Japan, Kazakhstan, Russia. Europe: Austria, Bulgaria, Czech Republic, Estonia, Germany, Ireland, Italy, Lithuania, Norway, Rumania, Russia, Slovakia, Sweden, Switzerland, UK, Ukraine, former Yugoslavia. North America: USA. TRANSMISSION: Both conidia and ascospores are air-borne, especially in humid conditions.