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