400 gallon smart pot candidates are sick

heres the deal I think I may have a powdery mildew situation under control but here’s the thing I was keeping these plants in a vegetative state to be used as mothers and to also be put out in spring some even in 100 to 400 gallon smart pots maybe 100 I’m northeast my summers not that crazy long but will this stuff come back if I got it under control like is it innnn the blood of these things lol, they are also under very weak lights if I put them under more intensity and they get vigorous are we good? Or does the mildew still lurk in the shadows?

But if environment is fixed and the spores under control is my plant already pre determined to have botrysis? Or will that completely rely on flowering conditions? I’ll keep treating with green curefor now I threw out the most affected ones seems to be working