Ascochyta avenae. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Ascochyta avenae. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Avena byzantina (Red or Algerian oat), A. fatua (Spring wild oat), A. sativa (common oat), A. mortoniana, Hordeum vulgare (barley), Loliumperenne (perennial ryegrass) and Triticum (wheat). DISEASE: Leaf spot or blotch of oats. At first lesions start as small purplish or chocolate-brown spots with a distinct margin. With time they enlarge, become elongated, grey brown and finally straw coloured. GEOGRAPHICAL DISTRIBUTION: Australasia & Oceania (New Zealand); Europe (Austria, Czechoslovakia, Germany, UK); North America (Canada, USA, Colorado, Oregon, Washington). TRANSMISSION: No specific studies reported. Presumably spread by air-borne conidia and those carried over in crop residues.