Rhynchosphaeria cupressi. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Rhynchosphaeria cupressi. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Cupressus macrocarpa, C. lusitanica, C. arizonica, C. torulosa, Cupressocyparis lawsoniana, Juniperus procera, Thuja orientalis. DISEASE: Stem and branch canker of young trees. Cankers are associated with profuse resin flow and in advanced states, a flattened, winged condition of the tissue may be produced. Cankers may girdle and kill young trees. GEOGRAPHICAL DISTRIBUTION: North America (USA); Africa (Kenya, Uganda, Tanzania, Malawi, Rhodesia, South Africa); Australia and Oceania (New South Wales, Queensland, Victoria, Tasmania, South Australia, New Zealand); Asia (India (Bakshi et al., 1970)). TRANSMISSION: Conidia and ascospores are released under moist conditions and dispersed by a splash take-off mechanism, after which they have a limited air-borne range (33: 191). Long distance spread is probably effected by human agencies.