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Ash dieback

Advice about Ash trees - ash dieback / Chalara dieback of ash

Ash tree Chalara dieback of ash is a serious disease of ash trees caused by a fungus called Chalara fraxinea (C. fraxinea). The disease causes leaf loss and crown dieback in affected trees, often leading to tree death, In continental Europe it appears to kill saplings and young trees very quickly, often within one year, however some older and larger trees have shown a tolerance, or resistance, and may only be weakened by the disease, dying because of other factors.

Chalara dieback has been noted in a small number of council sites across the New Forest district. The frequency and timing of our tree monitoring regimes will be modified to reflect this. 

The disease does not cause rapid or catastrophic failure of trees. Any danger from dead or dying trees is likely to be gradual and obvious over a period of year.

Arial deadwood caused by crown dieback can sometimes present a hazard, but it is worth remembering it is also a vital ecological asset, with many species requiring deadwood for the whole or part of their life cycle.

Safety considerations will be at the heart of tree officer decisions regarding the retention or removal of trees infected with ash dieback.

If you think you have found Ash with Chalara dieback please report your sighting to one of the following organisations:

Forestry Commission Plant Health Service
0131 314 6414

Forest Research Tree Health Diagnostic and Advisory Service
01420 23000

Fera Plant Health and Seeds Inspectorate
01904 465625"

Updated: 16 May 2018
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