You will see brown staining of the wood in a circle a little below the bark. You can often confirm that you have Verticillium Wilt by taking a branch that is showing these symptoms and cutting it across. Other times a tree may live for a long time, slowly becoming weaker and less attractive, but never dying completely. Sometimes the disease spreads quickly and a tree may die in a few years. Often this is first noticed when a branch starts to show fall colors in late summer, long before other trees begin to color at all.Īfter a few years no more leaves will grow and the branch will die. The lack of water and nutrients flowing through the tree causes branches to die at first small ones high up in the tree and later whole limbs lose their leaves and die. This disease is another fungus that enters through the roots and blocks the water passages inside the tree. This is a much more serious disease that affects all kinds of maples, but Sugar Maple and Silver Maple are the ones most commonly affected. Sprays and chemicals are rarely needed, as your tree will normally never be seriously harmed by these diseases. If you have a severe outbreak, make sure you rake up the leaves and destroy them, as these diseases go through the winter on old leaves and then re-infect the trees next summer. Trees that are well-watered, fertilized and cared for with usually develop fewer leaf diseases. Will These Diseases Harm My Tree?Īlthough these leaf diseases can be unsightly and cause trees to lose a lot of leaves during the summer, they are very rarely harmful and next spring the trees will grow normally, with lots of fresh, healthy leaves. This is another fungus disease, usually caused by an organism called Erysiphe. In hot, humid summers maples can sometimes show a white, powdery coating on the leaves, almost like flour has been thrown onto them. Several fungi can cause this disease, which is often seen suddenly when the weather is suitable, and then not seen much again for several years. The dead areas are often limited by the veins. The leaves will shrivel and then fall from the tree. This leaf disease causes large, irregular dead areas to develop around the edges of the leaves and in their centers. These are hard to accurately identify and are caused by several different fungi.
Maples can show several different leaf-spots that are usually brown, scattered all over the leaf and sometimes join together into larger areas of dead tissue. This disease is caused by a fungus called Rhytisma. There may be one or several spots on each leaf and leaves with a lot of spots may turn yellow and fall prematurely. Each circle is surrounded by a yellow margin. These can be very small or up to ½ an inch across. This is seen as black, roughly circular spots on the leaves. The most common are listed below: Tar Spot They are usually seen in mid to late summer and none of these diseases are life-threatening. These usually show up as different kinds of spots on the leaves. There are a variety of leaf diseases found in maple trees that vary in intensity from year to year and from place to place. The most common – and least important – problems can be seen on the leaves. So what signs might be telling you that your maple tree is in trouble? Maple Tree Leaf Diseases There are a few diseases that can occur and it is helpful to be able to recognize them and even more helpful to know what steps can reduce the chances of them occurring. Maple trees are usually healthy and live for many, many years.
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