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Bleeding canker on tree bark

Bleeding canker on tree bark

B260/0079

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Credit

GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY

Caption

Bleeding canker on a horse chestnut tree (Aesculus hippocastanum). Where this pathogen has been active, bark, cambial tissue and the phloem (sugar conducting tissue) are destroyed. If this damage spreads round the trunk then more general effects will be seen, namely yellowing of leaves, early leaf fall, failure to fruit and damage to the crown of the tree. Research suggests that a bacterium may be responsible. The disease affects trees ranging in age from young saplings to mature trees. It is estimated that some 35,000 to 50,000 trees are already infected over a widespread area. Photographed in Regent's Park, London, UK.

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