Healthy magnolia trees tend to resist leaf spot, so the best preventive measure you can take is to care for your magnolia properly. To be effective, though, the fungicide must be sprayed at the right moment. Read on to learn how to keep your tree at its best. Leaf blight is a common garden disease caused by the fungus anthracnose. There’s something so welcoming about a big, waxy-leafed magnolia planted in the center of a front lawn. … syringae. Since the green fungus is often unsightly, many gardeners seek to prevent and remove it from their magnolia tree. As the University of Connecticut (UConn) Extension observes, in the presence of the fungal spores, all it takes is "a film of water" on the leaf for the spores to germinate and penetrate the leaf. If you catch the fungus at the very start of infection or before it has appeared on your tree, you stand a good chance of halting its spread. When it is on the branch, it forms a canker which may girdle the branch and cause dieback. It is in these situations that chemical control is warranted. Consider using chemica… Like many ornamental trees and shrubs, magnolias may develop black or brown leaf spots. Because fungicides work as a protectant and not a cure, the right application time is before the fungus attacks the leaves. Do not dispose of diseased leaves by composting them, since the fungal spores can linger in the compost and spread to other plants. Step 1. It is at that point that foliage becomes diseased. Asked July 21, 2019, 1:29 PM EDT. Magnolias are so tough that many tree owners will never notice any real problems throughout their tree’s life, but when a sick magnolia tree is identified, the causal agent may be serious. Generally, diseases of magnolia trees aren’t serious or common, but a few are worth noting so you can act in an appropriate manner. These same or related fungi may affect a wide range of other plants as well. This requires that you be very vigilant and spray the tree immediately upon seeing the first signs of leaf spot. Since moisture promotes the spread of fungus, it is a good idea to enhance air circulation to the degree possible. In some plants, it doesn't cause widespread damage, but it can be extremely damaging to young magnolias. Fungi thrive in moist conditions. Sign up for our newsletter. Fungal diseases account for many of the problems with deciduous trees. In most cases, though, leaf spots on magnolia are caused by one of four common fungi: The actual spots are not always black, by the way. This requires that you be very vigilant and spray the tree immediately upon seeing the first signs of leaf spot. If applied too late, treatment won't be effective. Their advice typically is to remove the diseased brown leaves that have dropped and then dispose of them properly. Are Coffee Grounds Good for Magnolia Trees? It is dripping a blackish liquid onto the plants below and their leaves are blackish. Because fungicides work as a protectant and not a cure, the right application time is before the fungus attacks the leaves. In many cases, proper cultural practices will prevent and sometimes even treat … Inspect your magnolia tree for sooty mold. Magnolia tree disease treatment will always depend on both the age of the tree and the severity of the symptoms. According to the Pacific Northwest Plant Disease Management Handbook, a bacterium can also be the culprit: namely, Pseudomonas syringae pv. Pruning off branches of any surrounding trees or shrubs that may be invading the magnolias' space. To remove moss from the trunk, gently scrape downward until the entire plant is removed. When you choose to battle leaf spot on magnolia leaves, the best option is a copper-based fungicide. But, as the UConn Extension also notes, leaf spot can be a serious disease for trees under stress, which includes young, newly planted trees. To prevent it, do not allow the tree to become too damp, and cover the base of the tree with a plastic covering found in gardening centers during extremely wet weather. Magnolia tree disease/fungus. My magnolia tree has white fuzzy looking spots on the branches and the leaves are turning black. 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The first symptoms include the appearance of thread-like formation on the underside of leaves. To discourage creeping moss from overtaking the tree, cover the base of the trunk with fresh, new mulch each season. Learn how to keep your tree at its best in this article. When the problem is severe, it may cause the leaves to fall off and can lead to a tree that is virtually empty of foliage. By removing the insect infestation, you can control the fungus and get rid of the black mold that is ruining the look of your magnolia tree. Sooty mold causes a velvety growth on leaves and bark. How to Treat Fungus on a Tree. In warm, humid climates, mature healthy trees may experience an annual appearance of some leaf spot, and it is rarely a cause for serious worry. The idea is to prevent the fungus from spreading. 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