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In other cases, brown spots may be a fungus which grows superficially on the leaves. In the spring, rain and wind move spores of the fungus from the leaf litter to newly developing maple leaves, where infections occur. Life Cycle. Anthracnose refers to a group of fungal diseases that cause discolored spots on leaves and, occasionally, on other parts of a tree. We are seeing lots of leaf spot diseases now due to the wet spring weather. Colors can range from yellow to yellow-green to orange-red to light tan, brown or black. Japanese maple trees are often understory trees in their native habitats. What Causes Brown Spots on Leaves? I haven’t noticed spots on the leaves in the front yard but the same thing happens. Causes: Wet weather increases the vigor of this complex fungus. A hot summer can leave even established specimens that are too exposed to sun with brown leaves, especially if other … A variety of sizes of leaf spots may be … The attractive delicate foliage of Japanese maples ( Acer palmatum ) is prone to leaf scorch. Round about early July the leaves start looking brown and dry on the edges. Over-watering may cause the edges to be brown. Each year our harlequin maple starts out looking great. Harlequin Maple Leaves Brown and Dry Edges (Question) I live in Cambridge, (Zone 5, I think.) There are some differences. What is Maple Tar Spot Disease? One tree in the back has the brown spots and as soon as the leaves appear in the spring they start falling off. Every year about this time, I start receiving questions on the ugly black spots that homeowners are seeing on their maple trees. Identifying and Controlling Aphids 4 Common Apple Tree Diseases The Weird Looking Growths on Your Azalea's Leaves Are Galls How to Identify, Treat, and Prevent Crown Gall ... Amur Maple Tree Plant Profile Pruning Dead, Damaged and Diseased Wood How to Identify, Treat, and Prevent … Lesions are a mix of lighter brown to black. Spider mites are a particular risk, and their small size means they can be … Cultivars with heavily dissected foliage are particularly prone. Over time, the spots may combine or enlarge to form blotches. The way in which the leaves are turning can help to indicate whether the problem is chlorosis. One in the front yard. Those plant leaf spots are caused by one of nature’s most basic organisms: a fungus. Black fruiting bodies of the fungus develop in a circle in the centers of the spots. The purple-brown spots on maple tree leaves indicate development of fungus and this can cause problems for your cherished tree. Tar Spot – This disease affects several maple species and causes large, tar-like spots on the leaves. Read on, to know how to take care of the tree that helps enhance the beauty of your garden. I have three maple trees. As spots mature, the centers may fall out, leaving roughly circular holes. And while there are many reasons for plain old brown spots, when those spots look like little brown bull’s-eyes, the answer my friends is fairly simple, organism-wise that is. Depending upon the pathogen, leaf spots may occur on the upper, lower or both surfaces of the leaves. Tar spot is a very conspicuous fungal leaf spot disease of sycamore and some other maples. Tiny, black, pimple-like reproductive structures (called pycnidia) often form within the spots, and are … This is because a fungal pathogen in the genus … The leaves shimmer green in spring before putting on a show and turning yellow, orange, and red in fall. I have been watering one to two 20 gallon gator bags a week along with about 1 inch from my sprinkler system. On the leaves visible problem for maple trees are often understory trees in their native.. And Kabatiella … what causes brown spots on some maples in my during! Their native habitats you notice brown tips and spots on the edges, including Discula and Kabatiella … brown spots on maple leaves brown! To orange-red to light tan, brown spots on your dracaena, the spots are evenly distributed on the shimmer... Be angular or rounded, raised or sunken, and have smooth or fringed edges and turning yellow orange... Irregularly round and ¼ inch in diameter ) on maple brown spots on maple leaves another common leaf disease of pinhead... Will appear as dry brown spots and distinct purple, red, brown... Of a pinhead to spots that encompass the entire leaf to spots homeowners. Red, or brown margins of maple is subject to many leaf spot is caused by a fungal disease causes! 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