Alternaria tenuissima

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Alternaria tenuissima symptoms on Pittosporum tobira (click on image to enlarge it)
Source: Florida Department of Agriculture and Consumer Services - IPM Images

Alternaria tenuissima (Nees) Wiltshire 1933

conidia and conidiophores of Alternaria sect. Alternata - F, K: Alternaria tenuissima (click on image to enlarge it)
Authors: J.H.C. Woudenberg, J.Z. Groenewald, M. Binder and P.W. Crous
Source: Studies in Mycology, 2013, 75, p. 186

The fungus infects various crops, e.g. it causes dry core rot on apple during storage, with yield losses of 6-8%. Conidia are 10-70 μm long (mean 28 μm) and 5-15 μm wide (mean 5 μm) with 1 to 6 transverse and 0 to 2 longitudinal septa. Conidial beaks, when present, are short (5 μm or less) and tapered.