How do I stop powdery mold & mildew on my girl organically
First; increase airflow. Second; understand that in your climate it may be necessary to reduce the relative humidity. A dehumidifier will be a necessity in that case.
Treating: I use a 50/50 mix of distilled water and 3% peroxide. Spray on an hour before lights out and make sure there’s a LOT of air movement. Selective defoliation is likely necessary too. You will never eliminate it but you can control it until harvest.
Be sure to do a bud wash at harvest unless you like smoking mildew.
Check out The Watchmen’s First Grow Journal. He is battling this right now. I hope that this helps