How to Grow: Most ash tree varieties grow best in moist, rich soil; require full sun and plenty of space. If you’d like to establish ash tree varieties in your landscape, we can connect you with one of our reputable and qualified landscape experts that can help you purchase and plant new ash trees. Leaves may start to yellow and develop early fall color. The larvae of the emerald ash borer do most of the damage. Like various plants, the Arizona ash tree is open to many pests and diseases, including mildew, cankering, and different fungal infections. Often confused with frost damage, signs of anthracnose include brown areas on ash tree leaves, canker on the trunk and main branches, and purplish-brown areas along the veins of the leaves. Pruning can reduce specific defects or structural problems in an ash tree to greatly lessen the risk of failure. By following these steps, you can help prevent ash tree problems from starting. There are several damaging ash tree diseases and pests. I was back east visiting friends and everyone was talking about it.”. Some of the most common are: Emerald Ash Borer – This invasive wood-boring beetle has killed millions of ash trees in the United States by attacking the tree’s nutrient carrying vessels. To help make him feel better I told him to look at all the other ash trees in his neighborhood and he would see that all the other Modesto ash trees looked just like his. Mature and established ash trees benefit from ash tree fertilizer feedings of organic-based macro and micronutrients for the nutrition necessary to sustain their health. An interesting fact about the ash tree is its characteristic agile wood is used to make baseball bats. Puzzled I asked him, “Where did you hear about this disease?” As he paused to think about its origin, I tried to help prod his memory by saying “Maybe you heard it at a cocktail party?” Don’t ask me what inspired me to ask that, but the description was so far-fetched it just sounded like something he would have heard at that type of gathering. I explained to him that ash trees, and especially Modesto ashes are very susceptible to a foliar fungus called Anthracnose. It is especially harsh on trees when we have a very wet spring. by traverso | Jun 21, 2018 | News | 0 comments, I had a client call the other day and say: “I think my tree has that Sudden Ash Disease.”. There are over 60 ash tree species— the white ash being the largest of the family. This assists in reduction of certain ash tree diseases. To be more specific, the fungus that attacks ash trees is called Gnomoniella fraxini. Ash trees have an opposite branching structure, with multiple leaflets. “Could they have been talking about the Emerald Ash Borer?” The Emerald ash borer is a non-native pest that had been devastating the ash trees along the east coast and was slowly making its way west. It is caused by an invasive wood-boring beetle named emerald ash borer. I explained to him that ash trees, and especially Modesto ashes are very susceptible to a foliar fungus called Anthracnose. This beetle attacks the nutrient-carrying vessels of the tree, and has infested millions of trees in the United States alone. Ash Yellows – This disease affects mostly white and green ash trees. Lo and behold he answered back “Yes, that is where I heard about it! Newly planted ash trees can benefit from ArborKelp®, SavATree’s exclusive seaweed biostimulant which aids in tree establishment, promotes root growth and heightens stress tolerance. The disease is rarely fatal and that his tree would survive. It is especially harsh on trees when we have a very wet spring. The city of Modesto, California, is the home of “Old Grandad,” the original Modesto Ash tree (Fraxinus velutina). It was springtime when I received this phone call from a client. Anthracnose disease in ash trees is caused by a fungus that affects many other plants too. There are other problems that can occur, such as rust diseases, leaf scorch, webworms, mites, borers, and carpenter worms. Read more about the emerald ash borer. Pruning is recommended to preserve or improve tree structure, vigor and life-span. The ash tree has a lovely rounded crown and gray diamond-shaped furrowed trunk when mature. However, specific plants, such as Modesto ash trees, are pathogen-specific hosts for individual anthracnose fungal strains. His concern was that even though it was mid-May his ash tree had very few leaves and all the other trees were lush with new foliage. We also advocate the removal of branch stubs to promote successful and proper healing of wounds. I told him that I his ash tree didn’t have Sudden Ash Disease, though that label was a pretty good description of what he was probably seeing on his tree. The emerald ash borer (... Ash Yellows Is a Slow Killer. The ash tree may lose leaves and cankers may start to form on the trunk and branches, causing dieback. It made sense that he would meld these two devastating diseases together to explain why his Modesto ash looked so poor. Our tree care experts can help protect your ash trees and keep your landscape beautiful. The ash tree is a strong, medium to very large tree, depending on type, and a relative of the olive tree. If you suspect a problem with your ash trees, call a SavATree certified arborist right away for an evaluation and treatment options. 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