Anisogramma anomala
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Author(s): Joseph O'Brien, USDA Forest Service
Source: Wikimedia Commons
Anisogramma anomala (Peck) E. Miller 1962 - (eastern filbert blight)
This fungus infects hazelnut trees in North America, resulting in branch dieback and even death of the trees in severe cases. Some outbreaks have infected entire orchards with the death of many trees. The disease was first discovered around 1970 on European hazelnut trees (Corylus avellana) and the pathogen appears to have originated from native American hazelnuts (C. americana).
The symptoms consist of perennial branch cankers which can become large, girdling the branches. From autumn to spring, the cankers release ascospores which infect young emerging shoots in the spring. Infections have a latent period of 1-2 years. Management options include scouting, pruning out infected branches, and fungicide applications.
| Vernacular names | |
|---|---|
| • Deutsch: | Haselnusskrebs |
| • English: | eastern filbert blight |
| • Français: | brûlure orientale du noisetier |
- Other images of Anisogramma anomala (Wikimedia Commons, IPM Images and PaDIL - click to enlarge)
asci with ascospores
perithecial stromata in cankers on hazelnut
vertical section of ascal stroma showing embedded perithecia
hyphae (stained blue) growing in the outer xylem of a hazelnut branch
stained cross-section of stroma showing flask-shaped perithecia containing blue masses of spores
ascus with sexual spores
