How to Control Anthracnose. Dogwood anthracnose is most severe only in areas of the state that are higher than 2000 feet. It can affect plants in all of its growth stages and the results of infestation can be as simple as cosmetic damage to as worse as economic loss. As detailed in the May issue of GCM (7), anthracnose development on greens is closely tied to cultural practices. In the winter months when the air begins to chill, prune the shrub or tree to allow for better air circulation through the foliage. The shoots are also killed in this disease. Tan-coloured leaf spots, which often develop a purple border between the dead and healthy leaf tissue, coalesce into large blotches. Under Attack. Powdery Mildew: Erysiphe pulchra (formerly Microsphaera pulchra) is the fungus that attacks leaf surfaces and tender shoots and causes powdery mildew. Dogwood anthracnose is a relatively new disease to North America. New growth is covered with a fine, white, powdery coating, typically on the upper surfaces of the leaves. Dogwood anthracnose is a foliar disease caused by the Discula destructiva fungus. Tartarian dogwood (Cornus alba), redosier dogwood (C. sericea), and Cornelian cherry (C. mas) also are resistant to this disease. Host Plants: Dogwood anthracnose infects flowering (Cornus florida) and Pacific dogwoods (C. nuttallii). Initial symptoms develop on the lower leaves especially on the leaf margins and flower bracts. Kousa dogwood (C. kousa) is also susceptible to infection but is highly resistant to the disease and typically suffers only minor leaf spotting. "Don't confuse dogwood anthracnose with powdery mildew, which is really bad this year. 3 August 2005. Keep your dogwoods healthy with these tips. is a potentially fatal disease of dogwood. Used to prevent wood decay caused by fungus, propiconazole is a systemic foliar fungicide that helps to treat dogwood anthracnose. Unfortunately, chemical control of dogwood anthracnose can be difficult -- but not impossible -- and it is best to keep the fungus at bay before it has a chance to harm your plants. BioAdvanced 3-in-1 – Best Fungicide for Dogwood Anthracnose This particular product actively wards off insect pests and cures fungal diseases. Anthracnose is caused by a fungus, and among vegetables, it attacks cucurbits. Dogwood anthracnose symptoms Clemson University - USDA Cooperative Extension Slide Series. The disease can infect flower bracts, leaves, and fruit. Amanda Flanigan began writing professionally in 2007. Sycamore, white oak and dogwood are particularly susceptible to anthracnose. This protectant fungicide should be applied before the fungus occurs by spraying the foliage with the liquid until well covered. Cool wet weather promotes its development, and the optimum temperature for continued growth of the spores is between 75-85˚F. Davey uses cookies to make your experience a great one by providing us analytics so we can offer you the most relevant content. Anthracnose is a term used to loosely describe a group of related fungal diseases that typically cause dark lesions on leaves. However with the appropriate preventative measures, and proper treatment if necessary, the flowering dogwood can continue to offer the beauty and satisfaction to owners that has earned its place as the State Tree of Missouri. Pacific dogwoods frequently experience spring leaf drop while both species of dogwood will retain infected leaves in the fall. Flanigan completed two writing courses at Pierpont Community and Technical College. The fungus Discula destructiva causes dogwood anthracnose leaf blight and canker. Treatment Strategy. Cornus anthracnose is a fungal disease caused by Discula destructiva, which arrived in the UK from North America in the late 1990s. Discula destructiva. We have a young red dogwood tree that is sick, perhaps with anthracnose. Dogwood anthracnose joins a long list of threats to our native trees. Anthracnose caused by the fungus. Mulching dogwoods is vital, particularly during the winters. Dogwood anthracnose was first reported as a disease of flowering dogwood in the United States in 1978. 2001) Date of U.S. Introduction: First detected in the late 1970s (Daughtrey et al. Your arborist may recommend foliar fungicide treatments to help control dogwood anthracnose. Apiognomonia Veneta – Attacks london planes and sycamores. The fungus has caused extensive mortality of dogwoods in portions along the East Coast into the Southeastern United States since it was first discovered in the early 1970s. Infected leaves exhibit marginal leaf scorch, dead patches, reddish discoloration, yellowing and premature defoliation. 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