Ash dieback disease. Ash tree affected by ash dieback disease. This ash tree disease is caused by the fungus Chalara fraxinea,also known as Hymenoscyphus pseudoalbidus in its fruiting stage. It causes necrosis (tissue death) in the tree's stems,causing dieback of the leaves and shoots. Here,a lesion (brown,left) is seen on the tree's trunk. The disease can be chronic and can eventually be lethal,especially in young trees. This fungus was first found in the UK in 2012,and it is feared that the spread of the disease may affect millions of ash trees in the country's woodlands. Photographed in the UK by the Food and Environment Research Agency | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / UK Crown Copyright Courtesy of Fera |
Bildgröße: | 5145 px × 3430 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |