Horse Chestnut Leaf Problem

Discussion in 'Woody Plants' started by Maritime Gardener, Aug 27, 2005.

  1. Maritime Gardener

    Maritime Gardener Member

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    The leaves on our Horse Chestnut are turning brown and withering; however. new growth is still progressing. Can't see any sign of insects with the exception of a group of tiny white dots on one leaf; but it resembles the damage done to birches by the birch leafminer - and there is a birch tree about 20 feet away. See photos.
    Any explanations or suggested treatment?
     

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  2. Michael F

    Michael F Paragon of Plants Forums Moderator 10 Years

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    Check out the minor leaf disease fungus Guignardia aesculi.

    You're lucky it is not the Horse-chestnut leaf miner (Cameraria ohridella) which is currently ravaging the species across most of Europe
     
  3. Maritime Gardener

    Maritime Gardener Member

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    I know it's supposed to be only in Europe; but the photos and descriptions are a perfect match for Cameraria Ohridella.
     
  4. Michael F

    Michael F Paragon of Plants Forums Moderator 10 Years

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    It (fortunately!) isn't right for Cameraria - that has more evenly-sized rounded blotches with paler edges; the irregular-shaped uniformly brown blotches on yours match Guignardia much better. This is (at least over here) a very common minor fungal disease which shows up about this time of year
     
  5. BigG

    BigG Member

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    FYI. My Chestnuts do the same when we have a very dry Summer.

    Dave
     

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