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Sooty-Bark disease of Maples - Cryptostroma corticale
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Symptoms / species
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Impact / measures
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Pictures
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Occurrence map
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 | | Maples (Acer sp., mostly Acer pseudoplatanus) with wilting crowns or dieback. Detachment of the stem bark initially in form of rectangular areas, later on long and broad black stripes. The stripes consist of thick layers of microscopic fungal spores, which are dispersed by wind. In case of rain they are washed down from the stem to produce a blackish stained area around the stem base. In cross section the wood of the stem show a greenish, yellowish or brownish stain, which is, however, not specific for Cryptostroma. Where the discolored area reaches the bark, the spore bearing structures develop. Dead trees loose their stain in the wood, or it is replaced by rot-stain. If the spores are present, there are hardly possibilites for errors in diagnosis.
| | | Affected tree species | Birch; Maple; | | Affected parts | Stem; Shoot/Twig/Branch; |
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| Sooty bark disease of maples is a characteristic consequence of long and extraordinary warm summers. Only after a long period with permanently warm temperatures the fungus, which is often present in the wood without causing symptoms there, is able to start its growth from the heart-wood towards the bark. the disease is common in Northern America and in Europe in mild climates in the West, as well as locally in the Mediterranean area. Because of the extreme high number of spores there is a medical risk for people working in the forest close to diseased trees ("bark strippers lung").
Curative measures
Diseased trees can not be saved. They should be removed for the medical reasons mentioned above.
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| Sooty-Bark disease of Maples (Cryptostroma corticale) crown decline | | Sooty-Bark disease of Maples (Cryptostroma corticale) spore layers on the stem | | Sooty-Bark disease of Maples (Cryptostroma corticale) spore layers on the stem | | Sooty-Bark disease of Maples (Cryptostroma corticale) spore-dust cover the herbs near the stem base | | Sooty-Bark disease of Maples (Cryptostroma corticale) spores | | Sooty-Bark disease of Maples (Cryptostroma corticale) stain of the wood in cross section |
| 2021
Gnadendorf | 2020
Mistelbach | | Mistelbach | | Dornbirn | 2019
Wien | 2018
Matzen-Raggendorf | 2016
Wien 13. Hietzing | | Wien 13. Hietzing | 2005
Braunau am Inn | 2004
Wien 2. Leopoldstadt | | Hofkirchen im Traunkreis | | Wien 13. Hietzing |
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