Horse chestnut leaf blotch - Horse Chestnut Leaf Blotch

Horse chestnut leaf blotch is an unsightly, but not seriously damaging, disease of white- and red-flowered horse chestnuts. It causes irregular brown blotches on leaves.

What is horse chestnut leaf blotch?
Leaf blotch is an infection of the leaves of horse chestnuts by the fungus Guignardia aesculi, which causes irregular brown blotches, often with yellow margins. You're most likely to see attacks in summer.

It is specific to horse chestnuts and both the white- and red-flowered are affected.

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