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Anthracnose is fungal infection that usually causes tan or brown spots in leaves It is rarely lethal to your tree Keep dead leaves away from your trees Sometimes fungicide … Cankers may form on small branches, as evidenced by cracking and sunken bark (Figure 6). The sycamore anthracnose fungus, Gnomonia ... Anthracnose is the most serious disease of sycamore. The red weight slides on the metal shaft and assists in tapping the needles into the tree. This anthracnose fungus does not infect other trees, such as ash, oak, dogwood, maple, etc. Sprays are especially not recommended at this point because conditions for infection are no longer present, the thicker, more mature trees are less susceptible, and earlier infections cannot be eradicated anyway. Beech anthracnose symptoms can be confused with leaf scorch, a physiological disease associated with heat and drought. The lower branches tend to show the most severe symptoms. Spores have an extended opportunity to wash from branch and twig cankers to new leaves and shoots. Leaves drop during severe infections. The most common symptom of sycamore anthracnose is the slow development or inability of American sycamore to leaf out in the spring. On landscape trees, the fungi infect developing shoots and expanding leaves. Sycamore Anthracnose is a tree disease that is caused by the fungus Apiognomonia veneta. Symptoms: The leaf symptoms of anthracnose are dead areas of the leaf that develop along main veins, often in a V-shape from the margin of the leaf. They are usually found along main veins of leaves, but can also occur between the veins. Sycamore anthracnose is favored by cool, wet weather (temperatures under 60 F) during budbreak and the few weeks of growth that follow. The anthracnose fungus survives the winter in infected tissue on the tree and in dead twigs and leaves that have fallen to the ground. L’anthracnose du sycomore, l’oïdium et la dentelle du sycomore, ainsi que la pourriture des racines et du bois, le chancre et les champignons de pourriture du bois complètent d’autres menaces qui pèsent sur les sycomores. These diseases are less common in warmer regions that have less rainfall. Symptoms and Diagnosis . William Jacobi, Colorado State University, Bugwood.org. Small tan, brown, black, or tar- like spots appear on infected leaves of hosts such as elm or oak (Fig. Brown areas eventually enlarge to include the whole leaf. Symptoms/signs: Sycamore anthracnose has a range of symptoms corresponding to the three phases of this disease. Like anthracnose diseases of other shade trees, sycamore anthracnose is a very common occurrence in the landscape (Figure 1). However, healthy and vigorous trees will be able to tolerate yearly infections of this disease. What Are the Symptoms of Anthracnose? Pacific dogwoods frequently experience spring leaf drop while both species of dogwood will retain infected leaves in the fall. Fungicides are not recommended for current year symptoms because by the time you see symptoms it is too late to protect against new infections. Anthracnose symptoms vary with the plant host, weather, and the time of year infection occurs. Under conducive conditions these spots expand, killing more leaf tissue and causing premature leaf drop. Sycamore anthracnose symptoms include , blotchyirregular lesions that lead to shoot dieback and blighted areas. The first symptoms appear in early spring as the leaves begin to unfurl from the leaf buds, and at this stage the disease may be mistaken for frost damage. The fungi that cause anthracnose are Kabatiella apocrypta in maple, Apiognomonia veneta in sycamore, A. quercina in oak and A. errabunda in ash. Oblong lesions then develop on the stems often resulting in death of plants. 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