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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