Bleeding canker on tree bark

Numéro d’image : 11526173
Bleeding canker on tree bark
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
Licence : Droits gérés
Crédit: Science Photo Library / Douwma, Georgette
Taille de l’image : 3401 px × 5120 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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