# Fending off White Powdery Mildew **URL:** \ **Category:** Diseases\ **Created:** [May 16, 2023, 3:06pm UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992 "2023-05-16T15:06:11Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![SteveSS396](https://avatars.discourse-cdn.com/v4/letter/s/4af34b/32.png) [@SteveSS396](https://ilgmforum.com/u/SteveSS396)\ **Post date:** [May 16, 2023, 3:06pm UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/1 "2023-05-16T15:06:11Z")
I have (3) plants in my 3x3x6’ tent. (1) auto that should be chopped in a week or so and (2) photos that I will be flipping any day now. Over the last few weeks I have see small spots of WPM here or there on a handful of leaves on each plant. I’ve been spraying the auto once a week with 50/50 mix of distilled water and hydrogen peroxide and it seems to be fending it off of the buds. I thoroughly inspect the photos and remove any leaves that I find it on. Should I spray them with the mix periodically as a preventative measure? Daytime temps are 70-72 Night time temps are 63ish RH mid 50’’s Running an 18” box fan 24 hours a day at the top of the tent Running a 6” exhaust for 30 minutes on and 1 hour off throughout the day Will be adding a small fan at ground level tomorrow Sorry for the long winded response What else can I do or should I do to combat it? Thanks ---
**Author:** ![OGIncognito](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/ogincognito/32/475294_2.png) [@OGIncognito](https://ilgmforum.com/u/OGIncognito)\ **Post date:** [May 16, 2023, 3:38pm UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/2 "2023-05-16T15:38:42Z")
Post some pics Growmie, your RH looks spot on 🤟 ---
**Author:** ![Newt](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/newt/32/688722_2.png) [@Newt](https://ilgmforum.com/u/Newt)\ **Post date:** [May 16, 2023, 3:53pm UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/3 "2023-05-16T15:53:37Z")
You should do a bud wash at harvest. [![](https://global.discourse-cdn.com/growingmarijuana/original/4X/d/7/c/d7caf82caf7709be5d46cbb27992faef977954b5.jpeg "Washing the Contaminants Off of Hemp") ](https://www.youtube.com/watch?v=EgUKtq8-NZQ) ---
**Author:** ![Outlaw](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/outlaw/32/726558_2.png) [@Outlaw](https://ilgmforum.com/u/Outlaw)\ **Post date:** [May 16, 2023, 7:19pm UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/4 "2023-05-16T19:19:59Z")
I run my exhaust fan 24/7 most times and definitely during flowering. Good to keep the air exchanging constantly. ---
**Author:** ![ChittyChittyBangin](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/chittychittybangin/32/1095484_2.png) [@ChittyChittyBangin](https://ilgmforum.com/u/ChittyChittyBangin)\ **Post date:** [May 16, 2023, 7:44pm UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/5 "2023-05-16T19:44:50Z")
Constantly airflow is needed. ---
**Author:** ![SteveSS396](https://avatars.discourse-cdn.com/v4/letter/s/4af34b/32.png) [@SteveSS396](https://ilgmforum.com/u/SteveSS396)\ **Post date:** [May 31, 2023, 9:24pm UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/6 "2023-05-31T21:24:22Z")
Been clipping off any leaves that show the WPM. Below are pictures of one of the photos that I filled about 1 week ago. No WPM but just some spots that I am unsure if they are it ![IMG_1441](https://global.discourse-cdn.com/growingmarijuana/original/4X/3/d/8/3d8e12abd9c0bd04afebce39c5377643a36f28ef.jpeg) ![IMG_1442](https://global.discourse-cdn.com/growingmarijuana/original/4X/7/7/f/77f6753d238661cb72c5b5f33121724d343c739e.jpeg) ![IMG_1444](https://global.discourse-cdn.com/growingmarijuana/original/4X/9/f/e/9fe3ef619b75424ecc40dae61e138fc004709a76.jpeg) ![IMG_1440](https://global.discourse-cdn.com/growingmarijuana/original/4X/5/2/4/5242c3497df9222b223c383323a8bb569cbbcc8f.jpeg) ---
**Author:** ![OGIncognito](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/ogincognito/32/475294_2.png) [@OGIncognito](https://ilgmforum.com/u/OGIncognito)\ **Post date:** [May 31, 2023, 10:20pm UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/7 "2023-05-31T22:20:15Z")
Does it rub off? Can you zoom in on those tiny white specs in the 2nd pic? What’s your input and run off PH and PPMs? Remind me of the medium you’re using and the plants age Grow Bro 🤟 ---
**Author:** ![SteveSS396](https://avatars.discourse-cdn.com/v4/letter/s/4af34b/32.png) [@SteveSS396](https://ilgmforum.com/u/SteveSS396)\ **Post date:** [May 31, 2023, 10:31pm UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/8 "2023-05-31T22:31:59Z")
It doesn’t rub off. FFOF PH 6.3 to 6.5 going in. Not much difference coming out Runoff was 1100 the other day when I watered, did not feed Plants sprouted on 2/19. Flipped just over 1 week ago. Started testing PH and runoff about 3 weeks ago, prior to that I was using tap water that had been out for a week or so each time and the PH was way high. ---
**Author:** ![OGIncognito](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/ogincognito/32/475294_2.png) [@OGIncognito](https://ilgmforum.com/u/OGIncognito)\ **Post date:** [May 31, 2023, 11:51pm UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/9 "2023-05-31T23:51:04Z")
What are you using for nutrients? Something funky going on with the leaf edges and color. Resembles Magnesium deficiency but not 100% of what a typical mag deficiency looks like 🤟 ---
**Author:** ![SteveSS396](https://avatars.discourse-cdn.com/v4/letter/s/4af34b/32.png) [@SteveSS396](https://ilgmforum.com/u/SteveSS396)\ **Post date:** [May 31, 2023, 11:58pm UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/10 "2023-05-31T23:58:33Z")
Still have some nutes left in my soil as I wasn’t watering to a decent runoff. Have used a little Botanicare Bloom over the last few weeks and have given a cup full of Epsom salt/ water during a few of the waterings ---
**Author:** ![ChittyChittyBangin](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/chittychittybangin/32/1095484_2.png) [@ChittyChittyBangin](https://ilgmforum.com/u/ChittyChittyBangin)\ **Post date:** [June 1, 2023, 12:45am UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/11 "2023-06-01T00:45:11Z")
@SteveSS396 how much epsom salts were you using? ---
**Author:** ![SteveSS396](https://avatars.discourse-cdn.com/v4/letter/s/4af34b/32.png) [@SteveSS396](https://ilgmforum.com/u/SteveSS396)\ **Post date:** [June 1, 2023, 9:38am UTC](https://ilgmforum.com/t/fending-off-white-powdery-mildew/100992/12 "2023-06-01T09:38:33Z")
I mix 1/2 teaspoon of Epsom salt in a 1/2 gallon of water and give them about 8 ounces every few weeks