Horse chestnut bleeding canker is caused by the bacterium Pseudomonas syringae and causes rust-brown spots on the trunk.
See also:
Bacterial canker
Horse chestnut bleeding canker is caused by the bacterium Pseudomonas syringae. The bark of the horse chestnut shows bark infections: damp spots oozing rusty brown moisture. The moisture dry to rust-brown crusts. The affected bark is easily removed. Below it, the trunk dies. The infection can be deadly to the tree.
The disease was not found in Europe until 2002.
Where to find
Control
Cut away affected areas and disinfect.
Prevention
Keep the horse chestnut healthy by actively controlling the Horse chestnut leaf-mining moth and by watering it during prolonged drought and fertilizing it once every few years.
