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Horse chestnut leaf-mining moth has spread rapidly across since it was first identified as present in Britain from Wimbledon in 2002. The effect on the appearance of horse chestnut trees in late summer can be profound.
Cameraria ohridella (horse chestnut leaf miner). Credit: RHS/Entomology.
Horse chestnut leaf-miner is a small moth with caterpillars that feed inside horse chestnut leaves, causing brown or white blotch mines to develop between the leaf veins.
It is usually easy to spot trees affected by the leaf-mining moth, especially as the season progresses.
Horse chestnut trees appear to tolerate the moth and so control is not necessary or in most cases practical.
New to Britain in 2002, this moth has become widespread in England and is spreading in Wales. It may spread throughout most of Britain.
Monitoring the long term impact of horse chestnut leaf mining moth on the health of trees is key to understanding this pest. Through citizen science, gardeners can help with this work. Conker Tree Science is monitoring horse chestnut (Aesculus) trees for the presence of leaf-miner damage and are inviting members of the public to help by sending in their reports.
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