Chalara fraxinea

To all,

Has the death of Fraxinus caused by the anamorph Chalara fraxinea of Hymenoscyphus pseudoalbidus already reached the U.K. ? Coming from Germany, since 2010 it has invaded the north-eastern parts of The Netherlands with lots of young and some older ashes dying as a consequence. On Rügen (Germany), in 2009 it has killed hundreds of old ashes.

The symptoms are :

- development of yellowish to copper canker spots or necroses without slimy base on the bark of trunks and branches, causing the transport of water and nutrients locally to be blocked,

- followed by dying of one to two year old shoots or twigs,

- especially during summer, withering of the foliage occurs,

- in young ashes the process develops much quicker then in old trees and underneath the died twigs and branches sometimes a fasciate shooting of clusters of new twigs is documented.

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no it hasnt IME, but the last symptom you describe do you actualy mean fasciate as in the flat deformed stem growths many plants sometimes have? as in the new shoots are fasciated?

but the last symptom you describe do you actualy mean fasciate as in the flat deformed stem growths many plants sometimes have? as in the new shoots are fasciated?

Yes, fasciated from the Latin fascis, meaning bundle or cluster, shaped like the top of a witch's broomstick, or f.i. looking like the cluster of stems of Collybia confluens.

Dont take this the wrong way! im just trying to image the meaning? so can picture it, as witches brooms and "fasciations" are different

here fasciation presents as a flattening stem like this, are we thinking alike?

Dont take this the wrong way! im just trying to image the meaning? so can picture it, as witches brooms and "fasciations" are different ... here fasciation presents as a flattening stem like this, are we thinking alike?

No problem, keep asking until you have a clear picture. I don't mean witch's broomsticks as grow on birches (Taphrina betulina), in my country (witch's) broomsticks, used for sweeping floors with, have a tied together bundle of twigs and branches on top and that is what is called a fascis (from the symbol of the fascists), so no, not like that band fasciation you show.

Has the death of Fraxinus caused by the anamorph Chalara fraxinea of Hymenoscyphus pseudoalbidus already reached the U.K. ? Coming from Germany, since 2010 it has invaded the north-eastern parts of The Netherlands with lots of young and some older ashes dying as a consequence. On Rügen (Germany), in 2009 it has killed hundreds of old ashes.

The symptoms are :

- development of yellowish to copper canker spots or necroses without slimy base on the bark of trunks and branches, causing the transport of water and nutrients locally to be blocked,

- followed by dying of one to two year old shoots or twigs,

- especially during summer, withering of the foliage occurs,

- in young ashes the process develops much quicker then in old trees and underneath the died twigs and branches sometimes a fasciate shooting of clusters of new twigs is documented.

Last weekend, I found several partially or completely dead ashes on the Danish island Falster near the light tower of Gedser. I for the first time was able to extensively document the anamorphs (photo 1/2/3), the bark necrosis (photo 4) on the trunk and the died branches or defoliated crowns (photo 5/6) myself.

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never seen anything like that oop north

I will go and have a look on the Forest research site but thats nothing ive seen here yet and I do look at absolutely anything peculiar on any trees i work on.

Gerrit, it wasnt clear from the images what sort of region these anamorphs and peeling barks come from on the tree itself.

so my question is, is there a diameter limit to the symptoms?

Some good links to further reading

http://caps.ceris.purdue.edu/webfm_send/626

First Report of the Ash Dieback Pathogen Hymenoscyphus pseudoalbidus (Anamorph Chalara fraxinea) on Fraxinus excelsior in Belgium

Ash dieback: pathogen spread and diurnal patterns of ascospore dispersal, with special emphasis on Norway* - Timmermann - 2011 - EPPO Bulletin - Wiley Online Library

New host species for Chalara fraxinea

http://www.google.co.uk/url?sa=t&source=web&cd=15&ved=0CDYQFjAEOAo&url=http%3A%2F%2Fascofrance.fr%2Fuploads%2Fforum_file%2F15327.pdf&ei=QXcYTsuLLJHBtAaysaDKDw&usg=AFQjCNGlEM_1ZXbCG-Xs5aESlPhYkYykMQ&sig2=gn64YDCRgjTyRxACV-yVoA

Forestry commission says!

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