Lawrence's picture

Diseased ash tree

Observed: 1st November 2012 By: Lawrence

No identification made yet.

Species interactions

No interactions present.


lavateraguy's picture

Chalara fraxinea

The (fungal) pathogen currently causing problems with ash in Europe is Chalara fraxinea (aka Hymenoscyphus pseudoalbidus).

But, apart from imported trees, this has only as yet been recorded from two sites in Britain (in East Anglia).

Other diseases of ash include a host race of the bacterium Pseudomonas syringae and a second fungus, Nectria galligena, snd so on ...

Lawrence's picture

Chalara fraxinea

Thanks. I am anxious to know that this is not Chalara fraxinea. I haven't been able to find any definitive details of what Chalara fraxinea looks like. This doesn't look like a normal canker which doesn't seem usually to kill the crown of the tree and cause splits down the bark.


lavateraguy's picture


It seems the number of identified sites has gone up recently. Now about 20 sites in East Anglia. For what it's worth, nothing near you.

Unless you can identify the disease as something else perhaps you should contact the Forestry Commission.

Godsold House's picture

Chalara fraxinea

If you have a "smartphone" you can download the app "ASHTAG". This allows you to send your photos to a number of experts, along with a "pin in a map".

If no fancy phone then this link should get you more info:

Like you, I'm concerned about my trees locally; I DO live in East Anglia...

Rachy Ramone's picture

Fingers crossed...

...that this is merely a damaged tree, not an infected one, as Woolacombe is about as far west as you can get (in relation to East Anglia, that is!).

Lawrence, sorry to be picky but when uploading photos, could you possibly "rotate" them, save them, and then upload them?

Apparently my brain can't cope with looking at trees presented sideways..

Rachy Ramone

How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:

cabbageleek's picture

It doesn't look like Chalara

It doesn't look like Chalara to me. You should really see the most impact on the young shoots, only in the later stages will the trunk die.