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