Go get a burner now! Sprays mostly make the problem disappear for a week or two. PM eventually comes back because it is in your plant's system.
Take it from me. 98% of my SFV OG was infected on my last run. I thought I could get away with having 2 infected plants out of 6 in my 3x3 tray. The other 4 looked pretty good until harvest. Puff...every bud was covered with a dusting of PM!!!
I put 40 plus hours of painstaking leaf wiping with seranade, cutting infected leaves, tried other sprays, more fans (just helped to spread the problem) and got screwed by the shit in the end just the same.
Throw down $130 now on the burner or pay later with worthless moldy bud.
Einstein oil in veg to prevent it from forming. Don't sulfer burn within 3 weeks of applying oil. Can burn leaves. Burn 2 times per week for 3 hours lights off, ventilation and fans off during burn.
Get it Now!