Leaf Blotch of Horse-Chestnut
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Leaf blotch of horse chestnut is caused by the fungus Guignardia aesculi. This is a common disease which causes browning of the leaves especially during years with wet springs. It is usually not of concern to the health of the tree although young trees and nursery stock may suffer due to complete defoliation.

Cooperative Extension: Insect Pests & Plant Diseases
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