Bacterial leaf scorch can also be a problem. Other species are affected less frequently. Anthracnose becomes especially severe on species with susceptible twigs, such as sycamore and dogwood. This rapid wilting is frequently misidentified as frost damage. Dispose of fallen foliage to prevent the spread of the disease and prune back any diseased branches. For … Injections are performed in late summer (early September) when trees are in full leaf, and protection can last up to 3 years. My best guess was anthracnose. Anthracnose on Deciduous Trees Shade trees commonly affected by anthracnose are ash, dogwood, elm, hickory, maple, oak, sycamore, and walnut. Optimum conditions for growth. Anthracnose is a common name used to refer to a group of fungi that case damage to shade trees. The sycamore anthracnose fungal organism attacks sycamore trees early in the spring causing a rapid wilt of newly emerging leaves. Trees are adapted to a wide range of climate zones. There are some … Believed to be native to the United States, it is found throughout the range of sycamores. The recommended fungicides usually are readily available to homeowners at local nurseries and garden centers. Temperature and rainfall significantly impact the overall severity of this disease. Timing was critical, and repeated sprays were needed to have any effect at all. ‹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. To lower infection rates, clean up and destroy dead leaves and twigs as they can be a source of reinfection next year. Among ash trees, the cultivars Moraine, Raywood, and the Evergreen Ash (Shamel) are more resistant to anthracnose than others. A fungal disease that infects sycamore trees in the United States, sycamore anthracnose (Gnomonia leptostyla) is seldom fatal but disfigures and weakens the tree, making it a likely target for other deadly diseases or damaging pests. Leaf symptoms are typically along veins.The fungus overwinters on twigs and then splashes onto new growth, attacking the new buds and twigs in the spring. 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. You’ll find that there are quite a few diseases of sycamore trees. Although it does present somewhat of a maintenance issue in the form of dropped leaves and twigs, I have been impressed with its performance in urban environments. From what we see these trees should re-foliate this year. Management Of Anthracnose. Platanus occidentalis, also known as American sycamore, American planetree, western plane, occidental plane, buttonwood, and water beech, is a species of Platanus native to the eastern and central United States, the mountains of northeastern Mexico, extreme southern Ontario, and possibly extreme southern Quebec. Anthracnose is a common disease among deciduous trees, especially sycamore, ash and oak. Each spring, we see spotting and blighting of the leaves, buds, and sometimes stems of these trees. Always read label directions. Rake and destroy fallen leaves around susceptible trees that have branches close to the ground. 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. Sycamores can also develop stem cankers, which kill twigs and create a “witches broom” appearance on branch tips. 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. Watering during times of low rainfall can help maintain production and boost energy reserves for next year. In Minnesota, anthracnose is most common in cool, wet spring weather. This fungal disease turns the leaves brown along the veins. Fungicides registered for the control of sycamore anthracnose include chlorothalonil, thiophantemethyl, and copper fungicides. Anthracnose diseases are characterized by discrete lesions that are usually found along leaf veins. Prune out and destroy dead branches and twigs. Twigs can develop cankers, which are sunken areas of dead tissue (fig 4). This can cause leaves to fall off the tree too early. ©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. Sycamore anthracnose is a fungal disease that can cause leaf drop, twig dieback, cankers and the sudden death of more than 90% of a tree’s new shoot growth. 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 is rarely deadly, but can make the trees unsightly and cause areas of the tree to die back. Another common disease of sycamore trees include powdery mildew fungus. In severe cases, these lesions may run together and kill the entire leaf. 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. Each spring, anthracnose spores infect newly forming sycamore leaves causing brown or black blotches along leaf veins. The severity of infection is directly related to weather conditions as leaves emerge. Although anthracnose does not typically kill sycamores, according to Iowa State University horticulturists, it deforms the trees and occasionally proves fatal. 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. The good news is that sycamores have coexisted with anthracnose for eons and typically recover with a canopy of full leaves by mid-summer. This is an early-season disease and many tree species like sycamore will develop new foliage to replace diseased leaves. Larger, more mature leaves develop a brown growth along the main veins. Seed pods in the form of fuzzy ball-like clusters hang from the branches in winter. Trees usually survive these attacks but may lose apical control temporarily, resulting in increased lateral growth and decreased height. It is versatile enough to also occur in uplands and commonly invades abandoned fields with its light and fluffy, wind-dispersed seeds. Although it detracts from ornamental appeal, it rarely causes tree fatality and most species are able to coexist with the fungi. In order to really get a handle on this disease to make sure it does not spread to a healthy tree. Trees and shrubs that are prone to anthracnose include maple, camellia, walnut, ash, azalea, oak and sycamore. Cool and wet spring weather promote this pathogen by creating ideal conditions for it to thrive. 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. srN÷Ñ.Ğlõ,²ÏLJ¿,80^fNÂ\N¥{Ó›>RÖ¸´ö! These fungi are referred to as host specific. This disease affects sycamore trees, but there are some varieties that are resistant (namely the London planetree). Perhaps it’s one major downfall is susceptibility to a leaf and twig infecting fungus, referred to as anthracnose, which has plagued the species for the past few springs. Your sycamore tree is particularly susceptible to anthracnose —a fungus that turns leaves black and brown in summer. While there is no practical treatment for anthracnose, we can do a lot to help out sycamores during the growing season. In the average central Illinois river bottom environment, you won’t have to go far to find this tree. London planetree (P. × acerifolia) exhibits varying degrees of resistance while Oriental planetree (P. orientalis) is considered resistant. How Do You Treat Anthracnose? 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. 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