Diseased oak tree. View looking up at an oak tree with dead leaves. This is an early sign that the tree is infected with Phytophthora ramorum oomycetes. Oomycetes are a group of filamentous,unicellular micro-organisms that physically resemble fungi. Phytophthora ramorum causes the disease known as sudden oak death,which has had devastating effects on the oak populations in California and Oregon in the USA | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Greb, Peggy / US Department of Agriculture |
Bildgröße: | 3418 px × 5138 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |