This Blog covers nature sightings and related news in the Calderdale area.
It includes all groups - Plants, animals and fungi with links to specialist sites.
Anyone wishing to become a member of this Blog and post sightings please contact us.
If you would like to join the Halifax Scientific Society either email me or come along to the next meeting.
All welcome:
Please contact us about any sensitive records before posting on the blog

Wednesday, 5 October 2016

Ash Die-Back (Chalara fraxinea) but name now changed to Hymenoscyphus fraxineus

Ash Die-Back disease seems now to have established over a wide area of Park woodland and other areas in Todmorden.

It is mainly visible on saplings a few years old, where the upper leaves have died and gone black and drooping like an umbrella; the upper stems looking blotchy and either dead or discoloured. On some, just the side branches have died and the fungi then spreads both up and down the stem, creating characteristic diamond shaped lesions on the bark.

The asexual stage attacks the bark and encircles twigs and branches, cutting off sap flow. The sexual stage grows during Summer on the previous years fallen leaves and spreads the spores.

The disease is easy to spot at the moment as it stands out amongst otherwise green and healthy ash saplings. It would be interesting to know if anyone has seen signs of the disease from elsewhere in the valley, although there is little that can be done to prevent the spread.

I have seen mature trees affected the otherside of Whalley so expect more signs next year.

Forestry Commission don't visit to confirm as the disease is now so widespread.

                                  Diamond shaped stem lesions


  1. We have seen it on our rambles in the Ryburn Valley and at Cromwell Bottom Philip.

  2. Thanks Steve; I am now seeing it in many places. Yet I never see any reference to it in the press.