Copper Spray / Dormant Oil on a Nectarine
I live in Phoenix (Zone 8b)
I have a nectarine that oozed penny size areas of clear sap likely in response to heat stress from our brutal August. The tree looks fine now and stopped oozing in September. It's even put on some new growth. No sign of borers (no black streaks in the bark or holes).
I'd like to spray the tree with a copper solution when it goes dormant to minimize the chance that tree has bacterial canker. I'm also thinking about giving it about 2 or 3 weeks and then spraying with a dormant oil (volk oil). Does this sound like a good idea?