Alternaria japonica

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conidia and conidiophores of Alternaria sect. Japonicae - A-B: A. japonica, C-E: A. nepalensis. Scale bars = 10 µm (click on image to enlarge it)
Author(s): J.H.C. Woudenberg, J.Z. Groenewald, M. Binder and P.W. Crous
Source: Studies in Mycology, 2013, 75, p. 197

Alternaria japonica Yoshii 1941

This fungus is widely distributed and infects mainly plants from the family Brassicaceae, causing leaf spot and damping-off diseases. The lesions are typically dark brown (black spot disease) and the disease incidence can exceed 20% in young plants. The conidia are beakless, around 40-60 x 15 µm in size, with longitudinal and constricted transverse septa. In addition, knots of dark, thick-walled micro-chlamydospores are produced (Tidwell et al., 2014).

Synonyms:
Alternaria raphani