Or do you just love the seasonal colors of Dogwood trees? Spot anthracnose on dogwood (Cornus florida) petals.Joey Williamson, ©2009 HGIC, Clemson Extension. Widely cultivated as an ornamental, it is naturalized in New … Upon hatching, the young caterpillar finds a suitable place to enter the tree such as a wound, scar, woody gall, or branch crotch. Scales are unusual insects in appearance. Symptoms Leaves Foliar symptoms initially develop on lower branches and then progress upward. The spots may develop a grayish hue in their center during wet conditions. Begin treatment in early May and repeat four times at three-week intervals. Spot Anthracnose: This disease is caused by the fungus Elsinoe corni, one of the most common leaf diseases of flowering dogwoods. Nancy Doubrava, Former HGIC Horticulture Information Specialist, Clemson UniversityJanet McLeod Scott, Former Horticulture Information Specialist, Clemson UniversityJames H. Blake, EdD, Extension Associate/Adjunct Professor, Dept. Cultural controls should be the first line of defense. The spots are commonly found among the leaf nodes. When powdery mildew persists and sprays are repeated, it is recommended to alternate fungicides to decrease the chance of fungi developing resistance. If it isn't detected early, spotting can spread to the dogwood fruit. Do not grow grass over the root system area. But both of these trees have shown disease symptoms during the past few years (starting about 2004). Dogwood Anthracnose, Discula destructiva, is a damaging disease that attacks various species of Dogwoods. Thoroughly spray the trunk, major branches and any wounds on the bark. The blight spots have a girdle-like shape. Damage on dogwood (Cornus florida) caused by dogwood club-gall midge.Joey Williamson, ©2013 HGIC, Clemson Extension. It is caused by the Discula fungus. Jul 3, 2013 - Explore Rod Wilson's board "Dogwood trees", followed by 392 people on Pinterest. Flowering Cornus (dogwood) trees are grown for their showy coloured bracts in late spring and early summer. Maintain healthy dogwoods by following recommended cultural practices. All recommendations are for South Carolina conditions and may not apply to other areas. All information is provided "AS IS." 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). Three Dogwood Diseases . Ensure that you regularly prune-off dying and bent branches. Blighted gray or drooping leaves hang on the twigs and are often the first symptoms noticed during cool, wet weather. In response to the feeding and growth of the larva, a ½-1 inch long club- or spindle-shaped tubular swelling (gall) forms at the tip or along the stem. The light spotting seen on leaves of dogwood usually has little impact on tree health, but repeated years of early leaf drop can weaken the tree. However, immature forms, called crawlers, are susceptible. However, two dogwood tree diseases are potentially lethal to the trees. Infected petals can then infect the leaves they rest upon spreading the disease. Prevention of Dogwood Tree Bark Disease. Are your dogwoods in decline three dogwood diseases my dogwood tree is exhibiting many learn about issues affecting dogwood trees landscape dogwood anthracnose um common tree diseases. Read and follow all label instructions and precautions. Infected leaves exhibit marginal leaf scorch, dead patches, reddish discoloration, yellowing and premature defoliation. Powdery Mildew: Erysiphe pulchra (formerly Microsphaera pulchra) is the fungus that attacks leaf surfaces and tender shoots and causes powdery mildew. When choosing dogwood for landscaping, be sure the trees are healthy. The first symptoms that appear in the spring are spots on the leaves and flower bracts. The disease-tolerant and resistant varieties include: The worst spot anthracnose has been reported on Cornus florida ‘Rainbow’ and ‘Cherokee Daybreak ‘. Cultivars of the oriental dogwood Cornus kousa (such as ‘Milky Way’, ‘Milky Way Select’, and ‘National’) and many of the Cornus florida x Cornus kousa hybrids (such as ‘Aurora’, ‘Constellation’, ‘Celestial’, and ‘Stellar Pink’) are generally resistant to powdery mildew. Planting species and cultivars with some degree of disease resistance is an excellent option for managing this problem in the landscape. Leaf spotting is common among dogwoods. Cornus florida ꞌAppalachian Spring’ has a high level of resistance to anthracnose. Product labels will provide information on how often to spray. They may be found on leaves or stems and look like small brownish, grayish or blackish bumps. Dogwoods have a very shallow root system, and thus are very susceptible to drought stress, especially newly planted trees in full sun. 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