Sphaerulina betulae

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Sphaerulina betulae asexual spores (click on image to enlarge it)
Author(s): Paul Bachi, University of Kentucky Research and Education Center
Source: IPM Images

Sphaerulina betulae (Passerini 1867) W. Quaedvlieg, G.J.M. Verkley & P.W. Crous 2013

The fungus causes leaf spot on birch. The pycnidia have a diameter of around 50-100 µm. The conidia are 30-60 µm long, 1.5-3 µm wide and have up to 6 septa.

Synonyms
Septoria betulae