Alan,
Recently I began using a new product called Immunox. It is a combination contact insecticide & fungicide. I've sprayed several of my buttonwoods that had a scale infestation along with the usual black sooty mold. Neither tree reacted to the spray, and it really stopped the insect/mold problem. The only other chemical that will not harm buttonwoods that I've used is Sevin. I'd tred very lightly using Kelthane on a buttonwood.
Best wishes,
Ed Trout zone 10, 44 degrees this morning!!
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