Bleeding on the trunk and branches of horse chestnut in the UK is not a new phenomenon. This type of symptom was first reported in the 1970s, when the cause was found to be a fungal pathogen known as READ MORE http://www.forestry.gov.uk/fr/INFD-6KYBGV
What is a canker?
Canker: Localized necrosis of the bark and cambium on stems, branches or twigs. They are often sunken because the stem continues to get bigger elsewhere. Also, callus may be produ READ MORE http://www.forestpathology.org/canker.html