Phyllosticta ampelicida
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Source: Clemson University - USDA Cooperative Extension Slide Series - Wikimedia Commons
Phyllosticta ampelicida (Engelm. 1863) Aa 1973
The fungus causes black rot of grapevine, a serious disease in warm and humid regions. Both yield and wine quality are affected and it may lead to complete crop losses. It is native to North America and has been introduced into Europe with planting material (first record in France in 1885). It is also found in South America and Asia. In Europe outbreaks have become more frequent since 2002.
| Vernacular names | |
|---|---|
| • Deutsch: | Schwarzfäule des Weins |
| • English: | black rot of grapevine |
| • Español: | podredumbre negra de la vid |
| • Français: | pourriture noire de la vigne |
The fungus overwinters in fruit mummies and forms perithecia in spring which release ascospores. These infect the shoots and young leaves initially. After an incubation period of about 2 weeks brown lesions with pycnidia and conidia develop. The latter cause secondary infections on all parts of the vines. On berries, infections spread in circles until the berries are completely shrivelled and black.
Synonyms:
Guignardia bidwellii
For details see the respective page in Wikipedia.
- Other images of Phyllosticta ampelicida (Wikimedia Commons, IPM Images and PaDIL - click to enlarge)
initial symptoms on grapes
on grapevine branch
symptoms on grapevine leaf
cross-section of pycnidium
cross-section of pycnidium
conidia
asexual spore
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