This disease causes a white, powdery coating on upper leaf surfaces. This most often occurs to dogwoods growing under tall trees following a spell of rainy weather in summer. A variety of sizes of leaf spots may be observed on one plant. Asked August 3, 2014, 9:11 PM EDT. is that the leaf edges are brown. Asked July 5, 2015, 2:56 PM EDT. Problem: Within a couple days of planting the leaf tips started turning brown. Throughout summer, spots may become numerous enough to cause early leaf drop. If you see the white coating and cupped leaves on your tree, fungicides cannot cure the disease, which is already established. Colors can range from yellow to yellow-green to orange-red to light tan, brown or black. Some leaves also develop some fairly large brown spots on the leaves. The tree is a Chinese Dogwood (Cornus kous 'Chinensis'), which I believed was not susceptible to … I have lived in my house for six years and every one of those years the Dogwood will bloom beautifully, but when all the leaves come out they are always curled and many of them have brown edges and brown spots on them. The disease is unsightly, but typically not very harmful to the tree. Little by little more leaves are getting brown tips, then the margins turn brown and crumbly. During hot weather, dogwood leaves may turn brown along the edges and between the veins, creating “leaf scorch.” Drooping, reddening, It gets plenty of water. Camden County Missouri. The leaves usually are also droopy, reddish, and curled. Leaf spots may be angular or rounded, raised or sunken, and have smooth or fringed edges. The disease can infect flower bracts, leaves, and fruit. Initial indications include tan spotting along the upper portion of the leaves. How do I treat a dogwood tree displaying brown spots on leaves ? Last year, starting in about July, one of my dogwood trees developed brown crispy leaves. The symptoms first develop in the dogwood tree’s leaves. 1 Response. Some leaves have holes/cracks down the center. On dogwood trees, Mycrosphaeria pulchra is the causal pathogen for powdery mildew. How do I treat a dogwood tree displaying brown spots on leaves ? Hello, Most of the time the brown spots on dogwoods is Spot Anthracnose. Cankers forming on the twigs can … Some spots may have a purple-colored rim to them. Some have turned completely brown and fallen off. Dogwood tree has curled leaves and brown spots. The leaf spot symptoms are similar to dogwood anthracnose, however, Septoria does not infect the twigs or branches so it is a much less damaging disease. Discula destructiva, the fungus that causes dogwood anthracnose, can quickly kill a redosier dogwood and spread to surrounding dogwoods, causing mass destruction. Depending upon the pathogen, leaf spots may occur on the upper, lower or both surfaces of the leaves. Appearing in spring as small dots on foliage, the disease progresses into purple-edged brown spots that spread and cause the leaf to turn gray, gradually withering. The fungus Elsinoë corni causes a spot anthracnose primarily on Cornus florida. As the disease progresses, the leaves may cup or curl upward. Diseased leaves dry and hang on through winter. Then a patch of leaves started turning purple (their autumn color I believe). Dogwood Anthracnose. Some leaves could develop necrosis with a weathered look to the outer edges. This disease should not be mistaken for another more serious dogwood disease called dogwood anthracnose caused by the fungus Discula destructiva. Key Points. It causes angular, brown lesions bordered by a purplish color on the leaf. These are symptoms of leaf scorch of dogwood. Description: Small, brownish purple spots with tan centers dot the leaves. 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