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Chalara ash dieback symptoms

Dead or dying tops of trees
Dead or dying tops of trees, most easily seen throughout summer

 Ash dieback disease (Chalara fraxinea) - lesions which girdle the branch or stem can cause wilting of the foliage
Wilting leaves, most visible in spring and early summer

Ash dieback disease (Chalara fraxinea) - developing lesion centred on a dead side
Lesions and cankers on stems/branches/shoot, visible throughout the year

Ash dieback disease (Chalara fraxinea) - necrosis of rachis (arrowed) and associated desiccation of leaflets
Dieback of leaves with brown/black leaf stalks, most easily seen throughout summer

Fruiting bodies on fallen blacked leaf stalks
Fruiting bodies on fallen blacked leaf stalks, visible June to October

Ash dieback disease (Chalara fraxinea) - the wood and pith underlying bark lesions is usually strongly stained
Staining of wood under bark lesions, visible throughout the year

Last updated: 06/17/2013