H Rowan-Mountain Ash Diseases
Healthy Mountain Ash trees are gorgeous specimens that can help brighten up even the most unattractive yards. However, the species is not immune to diseases that can rob it of its beauty and charm.
Among the most common infections that afflict the Mountain Ash tree include:
- Cytospora Canker: This fungal disease targets the tree's trunk and branches by peppering it with brown, irregular shaped cankers. The ugly pimple-like masses can ooze and spread throughout the Mountain Ash. In severe case, the disease can kill the tree.
- Fire Blight: This infection kills the tree's flowers and leaves. Symptoms include black leaves, brown flower clusters and spores that ooze slime and infect the tree's branches.
- Leaf Spot: This shows as irregular, brown spots on leaves. If left untreated, tiny, black spores will form as well. Advance cases also cause leaves to drop prematurely.
Mountain Ash is also susceptible to sawflies which can defoliate the tree within a few days.
Found the above while surfing and thought it might help you with a diagnosis!