Powdery Mildew

Powdery Mildew by Jeff Kubina

Powdery mildew (Blumeria graminis) is a fungal disease that is common to indoor plants, especially during fall when temperatures begin to drop. Powdery mildew prefers temperatures between 60-70 ºF and humidity exceeding 40%. Pay close attention to your grow room environment during the night since this is when these conditions become most favorable.


The stems and leaves of infected plants show white powdery patches. As the fungus matures, the white spores will turn...

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