To all temperate growers indoor and out, how do you deal with powdery mildew during flower?
i am outside on Long Island where we have been experiencing unusually wet and humid conditions
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50/50 mix of water/peroxide in a spray bottle. Spray plant down just before lights out/sun down.
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Along with the peroxide be sure your plants have airflow. Stagnant air and humidity will cause PM. 
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A weekly IPM of biological insecticide and fungicide. Outside an oil based spray like green cleaner keeps mildew at bay.
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