The signs of root rot are wilting leaves and branches and leaf scorch, a condition marked by the browning of the edges and tips of a plant's leaves. Avoid high applications of nitrogen fertilizer, since this can promote very succulent (susceptible) new shoots. Infected leaves exhibit marginal leaf scorch, dead patches, reddish discoloration, yellowing and premature defoliation. WARNING: Some websites to which these materials provide links for the convenience of users are not managed by the University of Kentucky. ‘Spring Time' - Large flowers and good winter bud hardiness. Symptoms are small (⅛ inch), tan spots with reddish-purple borders. Tea made from dogwood bark was used to induce sweating to break a fever. Infected petals can then infect the leaves they rest upon spreading the disease. The pink dogwood (Cornus florida var. The use of the horticultural oil is a safer alternative to insecticides for spraying upward into a large tree (see Table 1 for specific products). The flower bracts are usually attacked first and then the leaves, young shoots, and fruit of dogwoods, primarily during wet spring weather. During autumn the leaves turn red-purple in color. For severe infections, fungicides containing chlorothalonil, thiophanate-methyl, or mancozeb can be sprayed (see Table 1 for specific products). As further infections occur, individual spots eventually merge to form larger spots. In the Washington, D.C. area, the Wild Flower Preservation Society placed posters on city streetcars, urging people not to cut or buy dogwood sprays. Crosses between Cornus kousa and Cornus florida (Rutger’s Hybrids) have greater disease resistance to dogwood anthracnose and include: ‘Aurora’, ‘Celestial’, ‘Galaxy’, ‘Ruth Ellen’, ‘Star Dust’, ‘Stellar Pink’, and ‘Constellation’. Insecticides labeled for use by homeowners against scale crawlers on dogwood include bifenthrin,  cyfluthrin, permethrin, lambda cyhalothrin, and malathion (see Table 1 for specific products). Dogwood Borer: The dogwood borer (Synanthedon scitula) is the larva (immature form) of a clearwing moth that resembles a wasp. Flowering Dogwoods (Cornus florida) One of the most popular of all flowering trees is the flowering … They also used the onset of flowering to time the planting of their crops.Pioneers would steep dogwood bark in whiskey, then drink this to treat "the shakes." In addition, protect the trees from unnecessary wounding, such as from lawn mowers and string trimmers, as this will reduce the chances of infestation. Upright and spreading in form, it matures in a rounded shape. For undergraduate student information regarding the Sustainable Agriculture program, contact Dr. Krista Jacobsen at (859) 257-3921, or krista.jacobsen@uky.edu. Powdery mildew is most common in dense, shady areas where the air circulation is poor. Leaf scorch is a common problem in dogwood tress, and a sign that your tree is under water stress. Warm, dry days and cool, damp nights favor disease development. Click here, then click on your county either on the map or from the list of counties below it. ‘Cherokee Brave’, ‘Springtime’, and ‘Pygmy’ have partial resistance. Do not grow grass over the root system area. Flowering dogwood grows fine in full sun if planted in deep, fertile soil that retains moisture. Fungicides for spot anthracnose will also help to control dogwood anthracnose. Like other dogwoods, the pink variation is a very good landscape tree for the rest of the year, with green foliage that turns purplish in fall, and reddish berries that draw butterflies and birds. Of course, flowering dogwood is not native to the area where Christ was crucified. Very effective fungicides for dogwood powdery mildew control include myclobutanil and propiconazole. Fungicides available for use include chlorothalonil, mancozeb, propiconazole, thiophanate-methyl, or copper fungicides (see Table 1 for specific products). 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