Bretziella fagacearum
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Author(s): C.E. Seliskar
Source: IPM Images
Bretziella fagacearum (Bretz) Z.W. de Beer, Marinc., T.A. Duong & M.J. Wingf. 2017
The fungus causes oak wilt in some parts of North America and is considered a major threat to Europe. It infects the outermost xylem of the trees and restricts the flow of water. Red oak (Quercus rubra) and related oak species are particularly susceptible and the disease often ends in tree death. Symptoms start at the tree top and at the tips of the branches and the leaves. The leaves turn brown (bronzing), drop and the symptoms spread quickly throughout the crown.
Dying oaks produce conidia and ascospores in sporulating mats on the bark. Conidia are 1-celled, cylindrical and about 5-20 µm long. Ascospores are ellipsoid with a size of 3 x 5-10 µm. Sap beetles like Colopterus and other insects are believed to be involved in the spread of the fungus (e.g. Hayslett et al. 2008).
| Vernacular names | |
|---|---|
| • Deutsch: | Nordamerikanische Eichenwelke |
| • English: | oak wilt |
| • Français: | flétrissure du chêne |
Synonyms:
Ceratocystis fagacearum
Chalara quercina
Endoconidiophora fagacearum
Thielaviopsis quercina
- Other images of Bretziella fagacearum (Wikimedia Commons and IPM Images - click to enlarge)
life cycle
symptoms on Quercus leaves
symptoms on Quercus fusiformis
symptoms on Quercus rubra
