Spraying for Peach Leaf Curl
I used to spray Daconil for PLC, roughly timing the sprays for Thanksgiving, New Years and Valentine's Day. After reading up, I switched to using MicroCop, basically copper.
For the most part I have kept the PLC pretty much under control.
This year, I missed the last spraying and my trees are inundated with PLC - my Nectarine, the earliest bloomer, got hit about 20% of the leaves. I have one Peach, the next to bloom, is around 40% and my last Peach to bloom is about 90% infected.
Would missing one spray, especially the last one make such a difference?
Or does PLC build resistance to copper?
Thanks. I'm in the SF Bay Area and we have a very dry spring.