Your maple might be suffering from a petiole borers infestation.
Aug 12, If trees are dropping their leaves in the heart of summer, it's a sign that something's wrong. For a number of reasons, it’s not good that your street tree is dropping leaves.
First, it makes a mess, but you already know that. Second, the tree is showing you that it is under stress, which is unhealthy for the tree and makes it more susceptible to insects and stumpchopping.barted Reading Time: 4 mins. When the leaves are falling off your tree during the summer another problem that could cause this would be if your tree is suffering from a fungal or bacterial infection and your tree could be putting all of its energy into fighting the infection rather than keeping its leaves green and stumpchopping.barted Reading Time: 6 mins.
Jul 20, It's lost 90% of it's leaves. An older cherry-it has still dropped leaves, but proportionately fewer.
If your tree has struggled through a drought period, it is important to know that recovery will take some time, even if you start watering immediately.
Another reason for leaf drop is disease, and the same ‘wet spring followed by hot summer’ scenario is also a perfect set-up for leaf diseases. In this case the leaves Estimated Reading Time: 3 mins.