©2020 University of Illinois at Urbana-Champaign | College of ACES |  Web Privacy Notice | EEO | Accessibility | Staff Login | myExtension, College of Agricultural Consumer & Environmental Sciences, Serving Champaign, Ford, Iroquois and Vermilion Counties, University of Illinois at Urbana-Champaign. While rarely fatal, the disease negatively affects the look of the tree and, with repeated years of infection, can affect its overall health. Sycamore is a fast-growing deciduous tree reaching 30 to 40 feet tall. Sycamore anthracnose is a disfiguring disease of sycamore and plane trees (Platanus sp.) It develops into a large, majestic shade tree with beautiful, creamy white inner bark that contrasts nicely with darker chunks of older, exfoliating bark over time to create a wonderful ornamental display of year-round interest. Sycamore trees may lose all of their leaves several times during the growing season. All of this results in the very bare-looking sycamore trees that Michigan residents have noticed. However, dogwood (Cornus florida) is one major exception with anthracnose infection causing widespread death of this species across its native range. Trees and shrubs that are prone to anthracnose include maple, camellia, walnut, ash, azalea, oak and sycamore. For … If left untreated, the tree may die from repeated defoliation. However, repeated years of severe infections can work to lower tree health over time. The perfect conditions are created when temperatures are in the 50’s during initial leaf out and bud break with frequent rain and wind helping to disperse spores and increase infection rates. Bacterial leaf scorch can also be a problem. Anthracnose on Deciduous Trees Shade trees commonly affected by anthracnose are ash, dogwood, elm, hickory, maple, oak, sycamore, and walnut. Labels may be updated yearly or more often. Although not a fatal disease by itself, sycamore anthracnose often weakens a tree making it more … It can infect a variety of tree species other than sycamore, making it one of the most widespread and unsightly diseases of shade trees in the Midwest. Sycamore adapts to a wide range of soils which makes it a hearty urban tree. Although a large, bare sycamore is unsightly this time of year, have faith that your tree will recover and leaf out in the coming weeks as rainfall lessens and anthracnose infection rates dwindle. This fungal disease turns the leaves brown along the veins. Although a large, bare sycamore is unsightly this time of year, have faith that your tree will recover and leaf out in the coming weeks as rainfall lessens and anthracnose infection rates dwindle. Because it’s more of a cosmetic issue than a serious tree … Each spring, anthracnose spores infect newly forming sycamore leaves causing brown or black blotches along leaf veins. To confirm, I was expecting to see damaged leaves as shown by Iowa State and re-growth of newer leaves that would be unaffected as the temperatures had risen enough to supress anthracnose. Always read label directions. Where possible, consider pruning out stem cankers as well to reduce spring spore production. How Do You Treat Anthracnose? Sycamore anthracnose is common and, at times, a serious disease for American sycamore (Platanus occidentalis). Larger, more mature leaves develop a brown growth along the main veins. Spores can infect new shoots and buds often killing them before leaves can even develop, creating the alarmingly bare tree canopies we can see now. Optimum conditions for growth. Anthracnose fungi need water to spread and infect, so the disease is more prevalent during wet, cold springs. This rapid wilting is frequently misidentified as frost damage. You’ll find that there are quite a few diseases of sycamore trees. It’s all caused by naturally occurring fungi that tends to ebb and flow with our spring weather over the years. In the meantime, enjoy the beautiful, contrasting bark that remains more visible in the absence of leaves with the hope that sycamores will fare well next spring and bark will be concealed by a thick canopy in June. Injections are performed in late summer (early September) when trees are in full leaf, and protection can last up to 3 years. The Pacific dogwood tree is susceptible to a form of anthracnose. We recommend looking into some treatment plans. Under conducive conditions these spots expand, killing more leaf tissue and causing premature leaf drop. It has been another difficult spring for sycamore trees across central Illinois as near bare canopies of this tree stick out among the fully developed leaves of neighboring trees. To lower infection rates, clean up and destroy dead leaves and twigs as they can be a source of reinfection next year. are deciduous trees prized as shade trees for their fast growth rate, attractive, unusual bark and large, lobed leaves. London planetree (P. × acerifolia) exhibits varying degrees of resistance while Oriental planetree (P. orientalis) is considered resistant. caused by the fungus Apiognomonia veneta. Anthracnose is a common fungal disease of shade trees that results in leaf spots, cupping or curling of leaves and early leaf drop. Disinfect your pruning shears between each cut with rubbing alcohol. You can help to prevent this disease if you do not water them overhead. It also affects shrubs such as privet. The severity of infection is directly related to weather conditions as leaves emerge. In Minnesota, anthracnose is most common in cool, wet spring weather. The fungus spreads from infected to healthy trees as spores carried by the wind or rain. Since leaf out typically isn’t completed until the very hot part of the year, anything that can be done to preserve moisture, such as mulching, is a huge help. Older leaves turn brown, and dead areas occur along the leaf veins. Spraying must begin at bud break and be repeated on a weekly or biweekly schedule until the weather warms, daily temperatures averaging above 60°F. It has large lobed maple-like leaves. ‹QÈy”ú¹Èɉlx_PüÈ "äÛùˆû ¿Î �$ï9ü/Rïj!¾lÎ_áÊè&%àJhĞEñV‚gŒ—.-¶Ún•œĞnÙ}@¸�# Î($2 å8ª}âıA�¥è”s”_àÍHŠy@[ úºÂmäí(@Œ#Şu¢š¸Ô£Ï”ä. One thing to note, however, is that while anthracnose isn’t often deadly for your tree, it can and likely will cause some aesthetic damage. Sycamore Anthracnose: A Nasty Tree Fungus. The most dangerous of the diseases of sycamore trees is anthracnose, also called leaf and twig blight. Managing Sycamore Anthracnose. In the average central Illinois river bottom environment, you won’t have to go far to find this tree. Anthracnose diseases are characterized by discrete lesions that are usually found along leaf veins. While there is no practical treatment for anthracnose, we can do a lot to help out sycamores during the growing season. However, this doesn’t necessarily spell doom for your sickly looking sycamore. Temperature and rainfall significantly impact the overall severity of this disease. The fungi that cause it, mostly from the family Gnomoniaceae, vary depending on the tree species. Your sycamore tree is particularly susceptible to anthracnose —a fungus that turns leaves black and brown in summer. Anthracnose becomes especially severe on species with susceptible twigs, such as sycamore and dogwood. The recommended fungicides usually are readily available to homeowners at local nurseries and garden centers. Sycamores can also develop stem cankers, which kill twigs and create a “witches broom” appearance on branch tips. Another common disease of sycamore trees include powdery mildew fungus. This can cause leaves to fall off the tree too early. Dogwood, birch, elm, walnut, butternut, hickory, and other trees may also be damaged. Cool and wet spring weather promote this pathogen by creating ideal conditions for it to thrive. Sycamore antracnose is more serious. Brown areas eventually enlarge to include the whole leaf. Although trees lose significant energy in spring while attempting to leaf out, once the canopy finally emerges, the energy produced during the rest of the growing season can supplement the loss. Sycamore anthracnose is rarely deadly, but can make the trees unsightly and cause areas of the tree to die back. Sycamore’s can be harder hit with anthracnose, and if it is a really bad infection, you can have enough damaged leaves to significantly harm your trees, but rarely does anthracnose kill a tree. Also, keep trees pruned to allow good air circulation. Anthracnose control begins with practicing good sanitation. The most commonly affected trees are ash, white oak, maple, and sycamore. Sycamore Leaves – April Sycamore Tree – May. In order to really get a handle on this disease to make sure it does not spread to a healthy tree. Prune out and destroy dead branches and twigs. May 2013 Brought to you by: It thrives on the deep fertile soils present in our bottomlands, occupying various locations in the floodplain from streambanks to occasionally flooded terraces and side slopes of the floodplain. Symptoms of sycamore anthracnose normally develop as small spots or dead areas centered along the veins of leaves or along leaf margins (Figure 2). Anthracnose. The most dangerous of the diseases of sycamore trees is anthracnose, also called leaf and twig blight.It can kill American sycamore, although it does only minor damage to other varieties. Fungicide protects your sycamore from anthracnose. Dispose of fallen foliage to prevent the spread of the disease and prune back any diseased branches. There are some … This is an early-season disease and many tree species like sycamore will develop new foliage to replace diseased leaves. Rake and destroy fallen leaves around susceptible trees that have branches close to the ground. This disease affects sycamore trees, but there are some varieties that are resistant (namely the London planetree). It also kills twigs and, if severe, entire branches. Sycamores (Platanus sp.) Diseases of Sycamore Trees. Like anthracnose diseases of other shade trees, sycamore anthracnose is a very common occurrence in the landscape (Figure 1). These active cankers also serve as reinfection sources during subsequent years. The potential pesticide exposure to the applicator that was spraying was huge, and the drift from spraying large sycamores could go way off target and … It is versatile enough to also occur in uplands and commonly invades abandoned fields with its light and fluffy, wind-dispersed seeds. 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