Horsechestnut Leaf Blotch - Horse Chestnut Leaf Blotch

Nancy Pataky

Horsechestnuts are not used widely in the landscape, but we do see this disease fairly frequently. It may be known as horsechestnut leaf blotch or Guignardia leaf blotch, named for the causal fungus, Guignardia aesculi. We see it most commonly on horsechestnuts, but buckeye trees may also serve as hosts. There is some resistance available in Ohio buckeye and in bottlebrush buckeye. Otherwise, the disease is fairly common in the Midwest.

College of Agriculture, Consumer, and Environmental Sciences
University of Illinois, Urbana-Champaign
Illinois Natural History Survey