Shamel ash trees (Fraxinus uhdei), also known as evergreen ash trees, originate in near-tropical areas of Mexico. It shows signs of ash anthracnose caused by a fungus disease (Gloeosporium aridum). Symptoms often don't show up until several weeks later. The leaf tissue develops a characteristic twisted or wrinkled appearance. Premature, unseasonal leaf shedding is common among such trees. During the early spring season, infected ashes might show brown patches developing on the underside of leaves. It is more severe in cool, wet weather. The nursery told me to water every day when the brown leaves started, that there was no chance of over watering due to the sandy condition. How often and how much should I water my Shamel Ash trees? The earliest symptoms include purple or brown spots with a cream-colored center on new leaves. I have tried five tree experts, but no one will visit the tree and offer help. They were 15 gallon transplants and have been in the ground for approx 2 months. I would be very grateful for any assistance as I would like to save the tree if possible. Some areas of the tree didn't progress past budding. The stately ash tree (Fraxinus spp.) Ash yellows affects both white and green ash trees. Shamel Ash Tree Care. Most Anthracnose-affected ash trees show small cankers, present on the middle and basal-level foliage. This disease attacks white ash (Fraxinus americana) and green ash (F. pennsylvanica) just after bud break in spring. As the disease progresses, the spots create a brown mass on leaves. Ash > Leaves > Leaves partially or completely brown. The fungus causes large, irregular brown patches on young leaflets, usually following the veins. I have a tree- 12 years old, I think it may be an Ash. Ash anthracnose is another common ash-tree disease. Infection is most common after cool, rainy weather, as these conditions favor fungal growth. Anthracnose Discula fraxinea . A fungus causes anthracnose. 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