In this episode of Talking Trees, we examine Pseudomonas syringae pv. aesculi, the bacterial pathogen responsible for horse chestnut bleeding canker—a serious disease affecting Aesculus hippocastanum across Europe.

Topics discussed:

• Identification and symptoms – How to recognize bleeding canker through bark lesions, dark exudates, and declining tree health.
• Disease progression – How the bacterium spreads through vascular tissues, disrupting nutrient flow and weakening trees.
• Epidemiology and spread – The role of environmental factors, human activity, and climatic conditions in the disease’s expansion.
• Current research findings – Studies from the UK, Germany, and the Czech Republic on pathogen identification, genetic analysis, and disease management.
• Best management practices – Sanitation, pruning strategies, and potential biological control measures for infected trees.

Bleeding canker has had a devastating impact on horse chestnut populations. However, early detection and proper management can help slow its spread. Join us as we explore scientific insights and practical solutions to combat this aggressive tree disease.

Background information:

• Mertelik et al. 2013. Occurrence of horse chestnut bleeding canker caused byPseudomonas syringae pv. aesculi in the Czech Republic.pdf
• Schmidt et al. 2008. Pseudomonas syringae pv. aesculi associated with horse chestnut bleeding canker in Germany.pdf
• Steele et al. 2010. Analysis of the natural infection of European horse chestnut (Aesculus hippocastanum) by Pseudomonas syringae pv. aesculi.pdf
• Webber et al. 2008. Isolation and identification of Pseudomonas syringae pv. aesculi causing bleeding canker of horse chestnut in the UK.pdf

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