shriveled leaves on Grace Cotinus
I have a Grace Cotinus (which I believe is a hybrid between the smoke bush and the smoke tree). It started off beautifully this year, after a spring pruning.
In the past couple of weeks, however, leaves have started shriveling up and falling off. Some branches are all brown, some still look healthy.
I don't see any fungus spots, or any bugs. I did have trouble with some sort of small white mite on this bush a couple of years ago, but if there are any insects on there now, they are invisible to the naked eye.
I'd be grateful for any help you can give.