Stemphylium vesicarium

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Stemphylium vesicarium (= Pleospora herbarium) (click on image to enlarge it) - a) immersed ascomata scattering on host surface; b) ascomata in small groups; c) section of an ascoma; d, e) asci with short pedicels; scale bars: a, b = 0.5 mm, c = 100 μm, d, e = 30 μm, f–j = 20 μm
Authors: Ying Zhang, Pedro W. Crous, Conrad L. Schoch and Kevin D. Hyde
Source: Fungal Diversity (2012) 53, p. 152

Stemphylium vesicarium (Wallr. 1833) E.G. Simmons 1969

The fungus is widely distributed and causes leaf diseases on a variety of crops. These include, among others, brown spot of pear, leaf spot on garlic, leaf blight of onions, and purple spot disease of asparagus.

On pear the spots expand, affecting the leaves, fruits and branches. Infected leaves and fruits drop prematurely and can be the source of new outbreaks in the coming year. Management typically relies on the use of fungicides.

The ascospores are around 33 x 14 µm large, ellipsoidal with rounded ends, yellowish brown, smooth and with thick gelatinous sheath. They typically have 7 transsepta.

Vernacular names
• Deutsch: Schwarzfleckenkrankheit der Birne
• English: brown spot of pear
purple spot of asparagus
leaf spot of garlic
• Français: stemphyliose du poirier

Synonyms:
Pleospora allii
Pleospora herbarum
Stemphylium herbarum