
For instance, Anthracnose might usually harm only a small portion of this London Plane tree, but this year it is almost entirely leafless, with small, stunted growth where there are leaves. You can also see witch's brooming, where the tree is pushing out new twigs around spots that were killed by the fungus.
Trees can come back from these diseases, although they may need extra care and/or fungicide treatments. Everything should really be in full leaf by now, so if it looks like your tree is getting a slow start, it may be because of a disease like this.
- Ken Almstead, Arborist in Westchester and Riverdale