My girls are almost end 3 weeks of flower. I was on a extended vacation where my grow area reached +60% RH do to my automatic watering and lack of air exchange. I have fixed that issue, but I noticed a penny sized patch of powdery mildew on one leaf. I removed the leaf. Is it too late to spray my plants with hydrogen peroxide or some other remedy? My girls are showing plenty of pre-bud pistols!
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Rule of thumb is to not spray your plants in flowering 😕 I hope that powdery mildew doesn't spread. I wrote a whole article on powdery mildew. See here: https://www.mrgrowit.com/post/powdery-mildew-on-cannabis-plants