Just a quick reminder about the 66-day PHI for mancozeb products. If you are thinking about harvest at the end of August or early September, we are getting very close to the limit.
You can switch to captan or copper, but these two cannot control black rot, thus, you may need to add a DMI or QoI fungicide for black rot. At least in our area, it has been dry (relatively speaking) so, depends on where you are, you may or may not need to be concerned about black rot. I see black rot on leaves sporadically in my vineyards, but not in the level I need to be greatly concerned.