White on fan leaves

[jthamule7]

My plants have white stuff growing on the fan leaves. They are 4 weeks into flowering. They are in soil outside.

[gbauto]

Powdery mildew-the scourge of my outdoor grows.
Cool, damp conditions create this.
Removing excess foliage to promote airflow and keep wet leaves from touching.
Raising the leaf surface pH with a baking soda solution sprayed on the leaves will knock it down, but if the environmental conditions persist it'll be back.

[Canuck147]

Yup - WPM - at the first sign I spray my plants - manufactured by Safer's - Defender Garden Fungicide - works great and I have sprayed my autoflowers well into flowering.

[Rwise]

I am using peroxide and water 1 to 8, 1 part peroxide and 8 parts water, spry it on the affected areas. Seems to be working.
Air flow, fan/s.
Edit I used "Trifecta Crop Control" last year, pricey but it worked.

[crucialbunny]

You do not want to fuck with that stuff. Spray it and maybe remove the most heavily affected leaves. Powdery mildew wiped out my cucumber and zucchini grow last year.