Episode Summary (English):

 In this Saturday episode of Talking Trees, we examine the devastating impact of Chalara fraxinea (Hymenoscyphus fraxineus), the fungal pathogen behind ash dieback in Europe. We explore the spread, symptoms, and susceptibility factors affecting Fraxinus excelsior and other ash species, including findings from Ukraine, Poland, and Lithuania.

We discuss:

• How the ash dieback pathogen and emerald ash borer are compounding damage in Eastern Europe
• The potential role of bud burst timing in ash resistance, with earlier-bursting clones showing greater survival
• The presence of wood-inhabiting fungi, like Armillaria cepistipes, in weakened trees, and their possible role in secondary decline
• The importance of phenological and genetic traits in breeding programs for resilient ash populations

This episode highlights current scientific insights into ash decline and disease ecology, offering a hopeful look at strategies for future forest resilience.

Background information:

• Davydenko et al. 2022. Invasion of Emerald Ash Borer Agrilus planipennis and Ash Dieback Pathogen Hymenoscyphus fraxineus in Ukraine - A Concerted Action.pdf
• Przybylski et al. 2024. Spring's Signal_ Can Bud Burst Timing Enhance Resistance to Ash Dieback in Europe_.pdf
• Wood-inhabiting_fungi_in_stems_of_Fraxin.pdf

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