What are the symptoms?
Common ash (Fraxinus excelsior) is susceptible to Chalara ash dieback disease as are a number of other species of ash. The disease can affect ash trees of any age and in any setting. Deaths can occur with younger trees (less than 10 years old) suffering mortality more rapidly, while the infection can be chronic in older trees. The wide range of symptoms associated with Chalara ash dieback disease includes:
The wide range of symptoms associated with Chalara ash dieback disease includes:
- Necrotic lesions and cankers along the bark of branches or main stem
- Foliage wilt
- Foliage discolouration (brown / black discolouration at the base and midrib of leaves)
- Dieback of shoots, twigs or main stem resulting in crown dieback
- Epicormic branching or excessive side shoots along the main stem
- Brown / orange discolouration of bark
Note: The symptoms described above are not exclusive to Chalara fraxinea and may be attributable to a number of other causal agents or factors, e.g. frost.