The dogwood does not need to be pruned, except in the spring and throughout … Fungi are the main causes of dogwood tree diseases. In Illinois, we may see three foliar diseases of dogwood. Cornus Florida, or Flowering Dogwood, is a small, deciduous, flowering tree that may grow 15 to 25 feet tall and 4 to 6 inches in diameter.Occasionally, it will reach a height of 40 feet with a trunk diameter of 12 to 18 inches. Don't Give Up On Dogwood But that doesn't mean you shouldn't try dogwoods. One of the most common tree diseases, for example, is known as dogwood anthracnose, and it’s caused by a fungal infection. Lookalikes: Do not confuse with dogwood anthracnose canker, which is deadly to the tree. This versatile shrub produces stunning blooms, ornamental berries and stunning fall foliage. Native to eastern North America, the dogwood is also cultivated across the world, wherever the climate may allow. With ornamental value in all seasons, East Tennessee's native flowering dogwood (Cornus florida) is one of the most beautiful small trees in the world. The early symptoms begin in mid to late May as leaf spots with tan or purple borders. The golden canker fungus can live within the branches of pagoda dogwood as an endophyte, a microorganism living within a plant without causing symptoms of disease. From a distance the crisp green leaves of the dogwood trees glisten in the sunlight along the Taconic State Parkway. Though not as severe a threat as it was several years ago, the … All are fungal diseases: Septoria leaf spot, spot anthracnose, and Discula anthracnose. Diseases And Pests Evergreen Trees Informative Tree Care. Symptoms include dieback on the branches in the early summer with dried leaves on twigs. Leaves that show the dogwood anthracnose spots will not fall off in the fall and often remain on the tree until spring. In the woods and in gardens the glory of these trees is an annual event so glorious it… Read More . In extreme infections, branches may dieback and buds won’t open. It starts out with blighted leaves, showing purple margins and tan color around the edges of leaves. In wet weather these spots can rapidly enlarge and kill the entire leaf. "It's a killer in the natural population of dogwoods," said Margery L. Daughtrey, a plant pathologist at the Long Island Horticultural Research Laboratory in Riverhead, in a telephone interview. The fungus causing botrytis blight leads to flower spotting, bud rot, and discolored shoots and leaves that will wilt, die and drop from the branches. Flowering dogwood trees are a major highlight of spring and early summer throughout the east. It was first observed in 1976 affecting a population of Cornus nuttallii in Washington state (Byther and Davidson 1979). Some of these cultivars are 'Aurora', 'Celestial', 'Constellation', Ruth Ellen', 'Stardust', and 'Stellar Pink'. Since its discovery in New York City and southwestern Connecticut in 1979, the disease has spread rapidly in all directions. For landscaped areas, flowering dogwoods: 1. Dogwood trees are versatile growers. This disease has done severe damage to dogwoods in the eastern and northeastern mountains. Prevention of Dogwood Tree Bark Disease. List of Symptoms/Signs Top of page. Lookalikes: Armillaria root rot, sunscald: FDACS-DPI Archive, FDACS, Bugwood.org: Armillaria root rot Armillaria is an aggressive root rot that can attack stressed or otherwise healthy plants. Up close, the leaves are full of small tan circles rimmed by a line of purple -- telltale signs of a deadly disease, dogwood anthracnose. In the wild, trees along highways started to show the same symptoms, and around Seattle the Pacific dogwood was showing them too (in the end the disease did not cause so much of a problem there). These are the upright twigs that develop on armlike limbs of dogwoods. The disease was first discovered in New York and Pennsylvania in the latter part of the 1970s and since then has been found in Maryland, West Virginia, Virginia, and reached western North Carolina. This fungal disease can weaken and even kill a dogwood over time. Dogwood anthracnose is a disease caused by the fungus Discula destructiva. The healthier your trees, the more easily they will be able to ward off this fungus. The female moth lays her eggs on the bark of the tree and is particularly attracted to injured bark, scars, and other rough areas on the trunk. The dogwood tree is one of the most beautiful and popular trees that you can grow on your property. "These are very unhealthy trees we are looking at," said Michael Birmingham, an associate forester for the State Department of Environmental Conservation, standing in a median of the parkway south of Millbrook in Dutchess County. Swollen tissue, cankers and sunken areas may appear on the dogwood trunk and branches. Caused by the fungus Discula destructiva, anthracnose thrives in moist shade. Controlling anthracnose can be difficult but not impossible. 2 . Throughout summer, spots may become numerous … Common flowering dogwood pests and diseases . Timely pruning is required to avoid diseases and insect infestations. Prune out cankers. Showy blossoms of white, pink, or red appear in spring before the leaves. This is a digitized version of an article from The Times’s print archive, before the start of online publication in 1996. Caused by the fungus Discula destructiva, anthracnose thrives in moist shade. R. L. 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