Cool, moist early spring weather is ideal for many types of fungi growth, which is exactly what the Chicago area experienced this year. Many commonly used shade trees in Illinois are affected by anthracnose diseases, when weather conditions are ripe for fungi development. Maple, ash, oak, sycamore and walnut trees are especially impacted, but many other frequently used landscape trees will also develop anthracnose diseases.
Small, tan to black spots on the leaves, distorted leaf growth and early season leaf drop are all common symptoms of anthracnose. Most anthracnose diseases are confined to the leaves, but oak and sycamore trees may also see stem and branch infection.
What can be done? Anthracnose diseases do not usually kill trees. The tree may shed diseased leaves, but new leaves emerge as weather warms. There are good cultural practices to follow that will promote tree health and the ability for the tree to ward off future fungi diseases. Prune the tree to allow for better air movement throughout the canopy. Water the tree during drought periods and fertilize trees to provide much needed nutrients. While most anthracnose diseases will not kill the tree, repeated infections can weaken the tree which makes it more susceptible to other diseases and pest problems.
Kramer Tree Specialists provides all the services needed to keep your trees healthy and happy. Call us today to have your trees evaluated by a Certified Arborist!