powdery mildew

A very friendly neighbor graciously let me harvest their grape vine since they weren't using it, which is awesome. However, since they weren't taking care of it, the grapes have some pretty widespread powdery white mildew on them. I washed them with water before freezing them but it's difficult...

I'm planning out my spray schedule this year and am looking for a 0 PHI solution for PM and DM, so I can control these diseases throughout the harvest season. Looks individually the 0.5% phosphorous acid (Rampart) sprays are good for DM and 1% JMS stylet oil is good for PM but is there risk of...