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Alternaria solani
''Alternaria solani'' is a fungal pathogen, that produces a disease in tomato and potato plants called early blight. The pathogen produces distinctive "bullseye" patterned leaf spots and can also cause stem lesions and fruit rot on tomato and tuber blight on potato. Despite the name "early," foliar symptoms usually occur on older leaves.〔(Early Blight of Potato and Tomato, HYG-3101-95 )〕 If uncontrolled, early blight can cause significant yield reductions.〔 Primary methods of controlling this disease include preventing long periods of wetness on leaf surfaces〔http://www.apsnet.org/edcenter/intropp/lessons/fungi/ascomycetes/Pages/PotatoTomato.aspx〕 and applying fungicides.〔http://www.apsnet.org/edcenter/intropp/lessons/fungi/ascomycetes/Pages/PotatoTomato.aspx.〕
Geographically, ''A. solani'' is problematic in tomato production areas east of the Rocky Mountains and is generally not an issue in the less humid Pacific or inter-mountain regions. ''A. solani'' is also present in most potato production regions every year but has a significant effect on yield only when frequent wetting of foliage favors symptom development.〔
==Hosts and symptoms==
''Alternaria solani'' infects stems, leaves and fruits of tomato (''Solanum lycopersicum'' L.), potato (''S. tuberosum''), eggplant (''S. melongena'' L.), bell pepper and hot pepper (''Capsicum'' spp.), and other members of the ''Solanum'' family.〔http://web.entomology.cornell.edu/shelton/veg-insects-global/english/eblight.html.〕 Distinguishing symptoms of ''A. solani'' include leaf spot and (defoliation ), which are most pronounced in the lower canopy. In some cases, ''A. solani'' may also cause damping off.〔http://pubs.ext.vt.edu/450/450-708/450-708.html〕〔http://www.infonet-biovision.org/default/ct/86/pests〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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