It's a little early for deciduous trees to be losing their leaves but a field maple I know has begun to do so. I suspect that it is suffering distress because not on all the branches have the leaves taken on a yellow tinge rather than the usual deep green of summer. Field maples are popular hedging plants in some parts of Britain. Elsewhere thay are usually single, taller trees. In autumn they naturally turn a fine, golden yellow, matched only by the lime tree. This leaf had caught itself on the arris rail of a fence and, havng no camera to hand, I snapped it with my phone.
photo © T. Boughen Camera: Phone