Fending off White Powdery Mildew

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

1 Like

Post some pics Growmie, your RH looks spot on :love_you_gesture:

2 Likes

You should do a bud wash at harvest.

2 Likes

I run my exhaust fan 24/7 most times and definitely during flowering. Good to keep the air exchanging constantly.

3 Likes

Constantly airflow is needed.

2 Likes

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




1 Like

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 :love_you_gesture:

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.

1 Like

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 :love_you_gesture:

1 Like

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

2 Likes

@SteveSS396 how much epsom salts were you using?

I mix 1/2 teaspoon of Epsom salt in a 1/2 gallon of water and give them about 8 ounces every few weeks