Identify Maple Tree Disease
Thank you for your question. Here is an Extension article suggesting two possibilities: https://www.canr.msu.edu/news/maple_leaf_blister_and_anthracnose_two_foliar_diseases_that_can_appear_on_s I suggest you contact your Extension office for advice: https://www.canr.msu.edu/washtenaw/county-extension-office Good luck!
- Prune out and destroy dead branches and twigs.
- Rake and destroy fallen leaves around susceptible trees that have branches close to the ground.
- When a specimen tree must be protected, fungicides can be applied. 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. There are some cases where a fungicide can be injected into a tree in order to protect it for more than one year.
- Most hardwoods develop new leaves quickly enough to prevent serious damage when defoliated early in the summer. If defoliation is not severe and twig death is has not occurred or if defoliation does not occur frequently or if the tree is not of very great value, spraying is not recommended.