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Diplocarpon rosae
''Diplocarpon rosae'' is a fungus that causes the rose black spot disease.〔McMaugh, J. ''What plants pest or disease is that?'', New Holland Publishing, Sydney, 2006, ISBN 1-86436-699-0, page 231〕
Because it was observed by people of various countries around the same time (around 1830), the nomenclature for the fungus varied with about 25 different names. The asexual stage is now known to be ''Marssonina rosae'', while the sexual and most common stage is known as ''Diplocarpon rosae''.
''Diplocarpon rosae'' over seasons as mycelia, ascospores, and conidia in infected leaves and canes. In the spring during moist, humid conditions, ascospores and conidia are wind-borne and rain-splashed to newly emerging leaf tissue. Upon infection, disease progresses from the lowest leaves upward, causing defoliation and black spots on leaves.
==Diagnosis==
The black spots are circular with a perforated edge, and reach a diameter of 14 mm. Badly affected plants, however, will not show the circular patterning, as they combine to cause a large, black mass. The common treatment of the disease is to remove the affected leaves and spray with antifungal solutions. Some stems of the roses may become affected if untreated, and will cause progressive weakening of the rose.
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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