Ramularia armoraciae. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Ramularia armoraciae. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Pale leaf spot of horseradish (Armoracia rusticana). HOSTS: Alliaria petiolata, Arabis sp., Armoracia rusticana (= A. lapathifolia; Cochlearia armoracia[Armoracia rusticana]; Nasturtium armoracia; Rorippa armoracia), Barbarea orthoceras, B. praecox, B. vulgaris, Brassica vulgaris, B. stricta, B. elongata, B. nigra, B. rapa, Bunias orientalis, Capsella bursa-pastoris, Cochlearia officinalis, Farsetia sp., Hesperis matronalis, H. sibirica, H. tristis, Raphanus raphanistrum, Rorippa palustris, Thlaspi sp. (Brassicaceae). GEOGRAPHICAL DISTRIBUTION: AFRICA: Kenya. NORTH AMERICA: Canada (Alberta, British Colombia, Manitoba, New Brunswick, Ontario, Prince Edward Island, Quebec, Saskatchewan), USA (Alaska, California, Colorado, Connecticut, Delaware, Florida, Iowa, Illinois, Indiana, Massachusetts, Maine, Michigan, Missouri, Mississippi, Montana, North Dakota, Nebraska, New Hampshire, New Jersey, New York, Ohio, Oregon, Pennsylvania, Texas, Utah, Washington, Wisconsin, Wyoming). ASIA: Afghanistan, Armenia, Republic of Georgia, India (Jammu & Kashmir), Japan (www.nt.ars-grin.gov/fungaldatabases), Kabardino-Balkaria, Kazakhstan, Kirghizia, Russia (Far East; Siberia), South Korea (SHIN & BRAUN, 1996), Turkey [= Asia Minor]. EUROPE: Austria, Belgium, Bulgaria, Czech Republic, Denmark, Estonia, Finland, France, Germany, Hungary, Great Britain, Ireland, Italy, Latvia, Lithuania, Netherlands, Norway, Poland, Romania, Russia, Slovak Republic (www.nt.ars-grin.gov/fungaldatabases), Sweden, Switzerland, Ukraine, Yugoslavia. TRANSMISSION: By wind and rain-splash dispersal of conidia. The fungus overwinters as sclerotia in the dead leaves or in leaf material that falls from the leaves resulting in shot-holes. The sclerotia produce new conidiophores and conidia in the spring (CHUPP & SHERF, 1960; DRING, 1961).