Wind and rain carry fungal spores to young leaves. On Japanese maple, lesions occur along primary veins and leaf margins and appear as tan-colored, papery spots. On sugar maple, lesions occur along primary veins and appear as large, brown blotches. Ash anthracnose after early spring infection. Defoliated trees should be watered and properly fertilized. Anthracnose of maple. The first application should be made at or just before bud break to protect new growth from initial infection in spring. Each year, Michigan State University Extension receives questions from the public regarding spots on the leaves of their favorite maple trees. Healthy trees may undergo defoliation in spring shortly after leaf out but are able to flush a new set of foliage and recover. These spots harbor the fungus responsible for anthracnose. However, the weakened trees become more susceptible to other stresses. While it’s usually not truly harmful, it can do serious cosmetic damage to your tree and hamper your curb appeal. Different species of anthracnose impact a variety of tree species, including oak, ash, maple, elm, hickory, walnut, birch, linden, sycamore and dogwood. Common examples are oak anthracnose, maple anthracnose , and sycamore anthracnose. Anthracnose weakens maple trees, and they benefit from a dose of fertilizer after an attack. When not busy learning about homes and appliances she's sharing that knowledge. As the disease and the season progresses, the spots grow and may eventually cover the entire leaf. Infected trees will need to have their dead wood pruned out and infected leaves destroyed. Plan the perfect garden with our interactive tool →, red maple tree image by Giovanni Aquaro from, University of Minnesota: Anthracnose and Other Fungal Leaf Spot Diseases of Maple. Why on the lower leaves? Anthracnose. Symptoms vary by host and by the fungal pathogen present but are characterized by irregularly-shaped, angular spots or blotches that occur primarily along the midrib, primary veins and leaf margins (Figure 1). Anthracnose control begins with practicing good sanitation. This sanitation practice will reduce the amount of spores present to infect new leaves and shoots the following spring and throughout the next growing season. Anthracnose can cause stress to the trees, making them more susceptible to insects or more diseases, so it is best to have a professional tree health expert manage the disease. The fungus overwinters in fallen leaves and in cankers on the twigs. Information on host(s) Main host(s) Maple Photos Maple, Oak and a few other tree varieties can get Anthracnose. These can include diseases, such as tar spot, verticillium wilt, anthracnose, leaf scorch, powdery mildew, and lichen, to name a few. All native and non-native maples commonly planted as woody ornamentals are susceptible to infection, such as: sugar (A. saccharum), red (A. rubrum), Norway (A. platanoides), silver (A. saccharinum) and Japanese (A. palmatum) maples. Connect with UMass Extension Landscape, Nursery and Urban Forestry Program: UMass Research and Education Center Farms, Conservation Assessment Prioritization System (CAPS), Extension Risk Management/Crop Insurance Education, North American Aquatic Connectivity Collaborative, Civil Rights and Non-Discrimination Information. Based in Houston, Texas, Meg Butler is a professional farmer, house flipper and landscaper. The fungus overwinters in these leaves. The wetter the Spring, the more issues there will be with all varieties of fungus and we all know just how wet this Spring has been in the Chicago suburbs. Maple anthracnose on red maple in early June in 2016 At most, probably 1% of the leaves or less will have fallen and maybe 5% of leaves show symptoms of maple anthracnose - though it seems like more. This publication discusses anthracnose on the shade tree hosts most commonly affected in Kentucky: ash, Picking up and disposing of all diseased plant parts, including twigs and leaves, from the ground or from around the plant is important. The anthracnose fungus that infects one type of tree (e.g., ash) is not the same one that infects another type of tree (e.g., maple). Maple anthracnose is not the same disease as oak anthracnose, although the symptoms of these diseases may be quite similar. The most commonly affected trees are ash, white oak, maple, and sycamore. Anthracnose is a common spring disease on maple trees common in the landscape including red (Acer rubrum), silver (Acer saccharinum), sugar (Acer saccharum) and Japanese (Acer palmatum) maples. Sterilize the rake by wiping it down with alcohol after you use it. Prune affected leaves by hand as soon as they begin to develop spots. Small branches can be pruned with lopping shears, but larger ones should be sawed off. Anthracnose. When we talk about shade tree anthracnose, we are referring to diseases caused by several different, but related fungi. But you should wait until fall when the fungus is dormant. ANTHRACNOSE DISEASES OF TREES Anthracnose diseases occur on many important shade and ornamental tree species throughout Connecticut every year, although the prevalence and severity of disease can vary with each season, site, and species. Anthracnose is not a significant threat to the health of the tree … Anthracnose is a term applied to an array of fungal diseases that affect shade trees. The fungi that cause it, mostly from the family Gnomoniaceae, vary depending on the tree species. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Anthracnose in maple trees is quite common. Both anthracnose and maple leaf blister can be the cause of late spring and early summer damage to leaves of these popular landscape trees. Anthracnose needs high levels of moisture to infect new tree buds. However, when anthracnose occurs on one tree, then weather conditions (typically cool and moist conditions) are favorable for development of the disease on many types of trees. Anthracnose needs high levels of moisture to infect new tree buds. Anthracnose is a common fungal disease of shade trees that results in leaf spots, cupping or curling of leaves and early leaf drop. Acervuli can be found on the upper or lower leaf surface and along veins or midribs (Figure 2). Wait until late fall, when anthracnose is dormant, to prune. Anthracnose on Deciduous Trees . Healthy trees may undergo defoliation in spring shortly after leaf out but are able to flush a new set of foliage and recover. 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