I usually spray copper early in veg, and neem on occasion. This year I've been doing EM1 spray once a week, and I've been spraying AgSil roughly once a week as well. I used to use Serenade... but I think the bottle I have must be at least 4 years old... maybe not that useful at this point.
ETA: I haven't noticed any PM on my pot plants yet, but there's some kind of tall weedy flower that grows in the bed in front of the house and year after year you can always count on that to start showing PM first. Sure enough, PM. I tried spraying it with Serenade figuring what the heck, but I need to use a better sprayer, tried using some cast-off cleaning spray bottle which didn't work all that well.