I do the copper sprays 2-3 times each season. I have a big problem with
peach leaf curl. So I start 1st spray in December. 2nd spray Jan/Feb and
then if I have time and the weather cooperates I will spray again using
the poly/sulfur and then an oil spray too, sometimes these last 2
combined but they work better and can be mixed stronger by them selves.
They must be separated by at least 2 weeks; the sulfur and oil.
Do not spray the sulfur on the apricot It is not listed and could
cause troubles. I do not know why.
This is for the N. Idaho Lewiston area. Zone 6 or warmer.
jcooper