Help! We have a well-established 'Omurayama' japanese maple in a shady location. It has been there 8 or more years, growing steadily. This year the leaves came out, but never really fully expanded, and now they're starting to brown and drop.
We've had an extremely wet spring (with moderate temperatures), and I'll warrant that this tree is not planted in well-drained soil, but why would it go south so fast? It was spectacular last fall.
Edit: looking at pictures of verticillium wilt in maples, but this doesn't look like that. The leaves are limp on the entire tree, not just from some branch tips.