ash necrosis is characterized by a very rapid onset of the disease, necrosis increases rapidly and after only a few weeks of infec

angustifolia armillaria ash autumn background blue branch chalara characterized cytospora damage diplodia disease diseased dry environment excelsior few foliage forest fraxinea fraxineus fraxinus fungal fungi fungus garden green horticulture hymenoscyphus illness increases infec infected infection landscape leaf leaves loss mushroom nature necrosis only onset outdoor park phomopsis plant pseudoalbidus rapid rapidly season sickly sky summer top tree trunk twigs unhealthy verticillium very weeks woods