Abstract
Abstract A description is provided for Peronospora knautiae . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Cephalaria transylvanica, Knautia arvensis, K. carpatica, K. caucasica, K. drymeia subsp. drymeia, K . integrifolia, K. godeti, K. montana, K. silvatica, Pterocephalus plumosus, Scabiosa columbaria, S. lucida, S . ochroleuca, Succisa pratensis . DISEASE: Downy mildew of Knautia and Scabiosa species. Leaf spots are violet or brown and sparse. GEOGRAPHICAL DISTRIBUTION: Asia-Temperate: Azerbaijan, Stavropol, Turkmenistan. Europe: Austria, Czechoslovakia, Denmark, Estonia, France, Germany, Italy, Latvia, Lithuania, Norway, Poland, Romania, Russia (Novgorod, Pskov, St. Petersburg, Yaroslavl), Sweden, Switzerland, Ukraine. TRANSMISSION: By conidia which are dispersed by wind or rain-splash.
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