Abstract
Abstract A description is provided for Doassansia sagittariae . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Sagittaria species, including S. sagittifolia, S. calycinus, S. cuneata, S. graminea, S. heterophylla, S. lancifolia, S. latifolia, S. montevidensis, S. natans . DISEASE: Leaf spot of Sagittaria species. The round or sometimes vein-limited, angular, spots often cover a large proportion of the leaf surface and are then very conspicuous. The disease usually appears on the plants year after year and is present throughout the vegetative season of the host, athough most obvious in the later part of that season. GEOGRAPHICAL DISTRIBUTION: Widespread in north temperate regions (33, 634). Europe: Austria, Belgium, Czechoslovakia, Denmark, Finland, France, Germany, Hungary, Italy, Latvia, Netherlands, Poland, Romania, Russia (European region), Sweden, Switzerland, UK, Ukraine; Asia: Russia (Republic of Georgia, Kazakhstan, Siberia, Yakutskaya ASSR; Ul'yanishchev, 1952); North America: Canada (British Columbia, Manitoba, Ontario, Saskatchewan; 46, 3383), USA (central states, north east states; Arkansas, Connecticut, Delaware, Florida, Illinois, Indiana, Kansas, ME, Missouri, MT, North Dakota, New York, Ohio, South Dakota, Texas, Vermont, Wiskonsin, Wyoming; 69, 2765); South America: Argentina. TRANSMISSION: From the habitat of the host plants water is assumed to be important in dissemination and infection. Germination of ustilospores either before or after release of spore balls by decay of host leaves inevitably results in presence of basidiospores in water. Liro (1938) suggested the probability of a saprophytic, budding phase in water, followed by early stages of host infection under water, but no detailed studies have been reported.
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