Ash Die Back

In recent years, extensive mortality of ash (Fraxinus excelsior) has occurred, as a result of infection by the pathogen Hymenoscyphus pseudoalbidus. Here, at Forest Research, we are investigating the genetics and biology of the causal pathogen, but this task would be helped if we could compare it to other Hymenoscyphus sp. that occur on species other than ash.

Therefore, if anyone were to come across any Hymenoscyphus specimens (white fruiting bodies, formed late spring / summer on stems, see below), we would be most grateful to receive any samples.

Please could samples be sent dry and the following information (where possible) provided: 

  • Host species
  • Sample location
  • Sample date
  • Name of collector 
  • Any other information (e.g. suspected Hymenoscyphus sp., presence / absence of crosiers, spore sizes etc.). 

Please send samples to: Joan Webber / Kevin King, Centre for Ecosystems Society and Biosecurity, Forest Research, Alice Holt Lodge, Gravel Hill Road, Farnham, GU10 4LH.

Many thanks for your help.

Hymenoscyphus sp. on rachis material (please note that fruiting bodies are often larger than this).