Stemphylium vesicarium
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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
This 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 on pear and other crops involves the use of fungicides and certified seeds, crop rotation and removing or burying plant debris at the end of the growing season.
Leaf blight of onion has become an important disease in north-eastern North America. It can defoliate the plant and result in yield and quality losses of up to 90%. The fungus persists in plant debris or weeds and can re-emerge in volunteer onions or through the production of ascospores in spring. For a review of this disease see Hay et al. (2021).
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
- Other images of Stemphylium vesicarium (IPM Images and Wikimedia Commons - click to enlarge)
symptoms on pear
symptoms on onion
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