Kuehneola uredinis. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Kuehneola uredinis. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On numerous Rubus species including American dewberries, blackberries, loganberries, ornamental and wild species. In Europe on R. fruticosus agg. (European blackberries). There are a few unconfirmed records on R. caesius (European dewberry) and on R. idaeus (red raspberry). DISEASE: Rust on canes and leaves of blackberries, loganberries, dewberries, ornamental and wild Rubus species. GEOGRAPHICAL DISTRIBUTION: Africa (S. Africa); Australasia (Australia, New Zealand); Europe (widespread); N. America (Eastern Canada, Eastern U.S.A.); South America (Argentina). TRANSMISSION: Teliospores germinate in late summer and autumn; pycnia and uredial aecia occur on leaves and stems shortly after (Fischer & Johnson, 1950; Wilson & Henderson, 1966). In spring the first true uredia appear on the fruiting canes and their spores infect the newly formed leaves. Thus the fungus overwinters either as aecial urediospores or mycelium in the canes. In less severe climates the true urediospores overwinter and the other stages of the life cycle are omitted.