Hi all - got a mystery for you. About a month back, my b. schlechtendalii, having gone great guns all spring, stopped leafing out. Tiny white dots then started appearing on the leaves, both established and young. The older leaves started to toughen and wrinkle a bit, and the newer ones yellowed and fell off. Having established that this is definitely not mites (I've dealt with those little monsters before), I'm at a loss. I've sprayed it down with an alcohol solution and wiped the leaves, thinking maybe some kind of micro-scale. This gets rid of the dots, but they keep slowly reappearing. Any thoughts?