Anthracnose on Deciduous Trees Shade trees commonly affected by anthracnose are ash, dogwood, elm, hickory, maple, oak, sycamore, and walnut. All the reddish spots on these flower bracts are due to anthracnose. Unfortunately, there is no cure but you can help the tree survive bouts of the disease through cultural methods. Dogwood anthracnose can affect all flowering dogwood species. The disease can infect flower bracts, leaves, and fruit. It was first observed in 1976 affecting a population of Cornus nuttallii in Washington state (Byther and Davidson 1979). The early symptoms begin in mid to late May as leaf spots with tan or purple borders. Dogwood anthracnose on dogwood (Cornus) Cornus species are riddled with leaf diseases. The following list is presented in most susceptible to least susceptible: Pacific dogwood (Cornus nuttalii), flowering dogwood (Cornus florida). 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. Control: Spot anthracnose is much worse on flowering dogwoods growing in full sun than in shade. Anthracnose is a fungal disease that tends to attack plants in the spring when the weather is cool and wet, primarily on leaves and twigs. Spores are spread by wind to surrounding dogwoo… Since disease severity is sporadic depending on how wet the spring season is routine fungicide applications are not recommended. Hi, I’m James Blake, Director of the Clemson Extension Home & Garden Information Center. COVID-19 Extension Updates and Resources ... More Information ». Control of this disease is really hard to accomplish. If this document didn’t answer your questions, please contact HGIC at hgic@clemson.edu or 1-888-656-9988. The shoots are also killed in this disease. Unlike Spot anthracnose, Dogwood anthracnose can lead to tree death under certain environmen­ tal conditions. Anthracnose can also cause basal rot in grass, causing the roots to rot away and die off. These spots can be numerous and often fall out producing a ragged leaf appearance. The infection is manifested in the form of leaf spots and stem cankers. It causes dieback or even death of infected trees. Your dogwood bloomed beautifully this spring and the flower petals picked up the disease. The spot anthracnose fungus infects leaves, young shoots, and fruit, causing small spots with purple borders. This is fairly common on flowering dogwood trees in Maryland and tends to be more severe in years when we have very wet spring weather. Reddish-purple spots on flower bracts are up to 1/10 inch in diameter. Dogwood anthracnose causes various leaf symptoms, including blight, blotch and leafspot. Dogwood Anthracnose Dogwood anthracnose can be prevalent in native dogwood populations in Kentucky forests, as well as in landscapes where dogwoods grow in shaded locations. Spot anthracnose. It has been confirmed in northern Georgia. The following article should help you determine whether your tree does in fact have anthracnose … The disease is most severe when we have high rainfall amounts as the flower buds are opening and as the leaf buds are opening. For control of this disease with fungicides, you would have to spray every 7-14 days from the beginning of the flower bud break until the leaves completely expand. REC, Western Maryland REC, Lower Eastern Shore If spot anthracnose is severe on young trees, they can be protected with a registered fungicide applied in the spring at bud break followed by additional sprays every 7 - 14 days until leaves are fully expanded. 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