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Doncaster Nats Forum    General Boards    Interesting Non-Local Sightings  ›  Bleeding Canker of Horse Chestnut Moderators: Forum Administrator

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Nora Boyle
May 10, 2013, 8:30am Report to Moderator Report to Moderator
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This photograph of Bleeding canker of Horse Chestnut was taken at Angler's Country Park on May 7th 2013. The canker is caused by the bacterium Pseudomonas syringae pathovar aesculi, which appeared in this country in the early 2000s. An infected tree will show characteristic rust coloured spots typically at the bottom of the tree where it kills the bark. The host produces a toxin in response to the attack and this manifests as a thick sticky gum which dries to a black crust at the point of exit. At these places the outer bark is easily peeled away. The tree will typically produce side branches lower than the canker.Severely affected trees have thinning crowns with dead branches and can die if the infection is severe, otherwise they can still be growing 10 years hence.

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