// Definition
Strategies for preventing and eliminating powdery mildew (PM) in cannabis cultivation. PM is an obligate parasite that hooks into plant tissue but is not truly systemic. Prevention through clean clones and environmental isolation is far more effective than treatment.
// From the Episode
Extended panel discussion. SPEAKER_02 stressed that the idea of PM being systemic is 'bro science' — it uses a hook into plant tissue but can be cleaned from plant surfaces. Fletch (SPEAKER_12) stated he has never visited a single commercial California facility without persistent PM issues, and shared that growers who never accept outside clones and never visit contaminated gardens have zero PM. SPEAKER_02 noted temperature swings matter more than humidity alone. Multiple panelists discussed contamination vectors including clothes, shoes, hair, phones, brooms, and mop buckets.