Valsa ceratosperma. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Valsa ceratosperma. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Valsa ceratosperma is known to be a pathogen, causing Valsa canker of apple trees in Japan (Sawamura et al., 1990). HOSTS: Dead or dying twigs and branches of numerous woody angiosperms. GEOGRAPHICAL DISTRIBUTION: Asia: Azerbaijan, China, Republic of Georgia, Japan, India, Korea, Russia. Australasia: Australia. Europe: Austria, Czech Republic, Germany, Greece, Italy, Lithuania, Portugal, Rumania, Russia, Slovakia, Sweden, Switzerland, UK, Ukraine. North America: USA. South America: Argentina. Spielman (1985) describes distribution as worldwide. TRANSMISSION: By air-borne conidia and ascospores in humid conditions. Conidial and ascospore dispersal of V. ceratosperma was studied in apple tree orchards in Japan (Fujita et al., 1980; Saito et al., 1972).