Septoria urticae. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Septoria urticae. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Leaf spot, severe foliar necrosis, defoliation. Sometimes spots eventually fall out and leave a round shot-hole (GROVE, 1935). In inoculation experiments the fungus has caused complete wilting of the leaves followed by the intense defoliation. The disease can affect plant growth and can considerably reduce numbers of seeds produced (DAL-BELLO et al., 1993). HOSTS: Laportea canadensis, Parietaria officinalis, Urtica angustifolia, U. cannabina, U. chamaedryoidis, U. dioica, U. gracilenta, U. gracilis, U. lyallii, U. pilulifera, U. urens (Urticaceae). GEOGRAPHICAL DISTRIBUTION: NORTH AMERICA: Canada, USA. SOUTH AMERICA: Argentina. ASIA: Azerbaijan, Republic of Georgia [www.cybertruffle.org.uk/gruzmaps/index.htm], India, Iran, Israel, Kazakhstan. AUSTRALASIA: Australia. EUROPE: Austria, Belgium, Bulgaria, Czech Republic, Denmark, Estonia, France, Germany, Great Britain, Greece, Hungary, Italy, Latvia, Lithuania, Moldova, Netherlands, Norway, Poland, Romania, Spain, Sweden, Ukraine [www.cybertruffle.org.uk/ukramaps/index.htm], former Yugoslavia. TRANSMISSION: Not reported, but almost certainly by airborne or splash-dispersed conidia, also from infected plant debris. Successful application of spore suspensions in water and humid chambers in inoculation experiments with S. urticae confirms the role of moisture in infection transmission.