Ustilago trichophora. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Ustilago trichophora. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Echinochloa spp. including E. colonum, E. crus-galli, E. crus-galli var. frumentacea, E. crus-galli var. zelayensis, E. holubii, E. turneriana, E. walteri; occasional records on Panicum spectabile, Paspalidium geminatum, Sacciolopis striata, Tricholaene teneriffae. DISEASE: Loose smut or node smut of Echinochloa. Field symptoms vary from relatively inconspicuous infection of a few ovaries in an inflorescence, through node and culm infection with normal inflorescence production, to infections that result in production of rosettes of short leafy axillary shoots and no inflorescence or distortion of the entire shoot system. GEOGRAPHICAL DISTRIBUTION: Africa: Egypt, Malawi, Morocco, Nigeria, South Africa, Sudan, Tanzania, 'French Congo'; Asia: Azerbaijan, Burma, China, Republic of Georgia, India, Japan, Kazakhstan, Turkestan, Turkey, Uzbeckistan, 'Far East'; Australasia: Australia (NSW, NT, Qld.), New Zealand; Europe: Bulgaria, Czechoslovakia, Hungary, Italy, Lithuania, Moldova, Romania, Russia, Spain, Switzerland, Ukraine, Yugoslavia; North America: Canada (Quebec), Mexico, USA (range of E. crus-galli, Arkansas, California, Colorado, Connecticut, Washington DC, Delaware, Florida, IA, Idaho, Illinois, Indiana, Kansas, Louisiana, Maine, MD, Manitoba, Montana, North Carolina, Nebraska, New Hampshire, New Mexico, Nevada, New York, Ohio, Oklahoma, Oregon, Pennsylvania, South Dakota, Texas, Utah, Washington State, Wisconsin, Wyoming; 69, 2765); Central America and West Indies: Cuba; South America: Argentina, Venezuela. TRANSMISSION: The dusty spore mass is readily disseminated by wind or rain, enabling infection at various times in the host vegetative cycle. Infection is also sometimes seedborne.