please help! powder mildew ...

hello everyone,
this is the first time i have experienced this indoors, ill add all the info below:

the max humidity got up to 50percent, it hasnt recently and i believe i have solved that problem, its been in the 30s for the last two days

i have scowerd all over and found only one plant that had very slight spots of mildew on a total of four leafs, im honesly suprized i even found them because the spots were not that bad

im only in week 3 ..

so my questions ... now that humidity is down and should not bounce back up, should i spray or something ?

what should i spray if so ? ive read peroxide and baking soda, there are no buds yet just the bunches of hairs

baking soda is supposed to be more preventative and peroxide as i understand will kill any existing spores, anyone tried mixing and using both ?

should i even worry now that humidity is down to the30s will that alone prevent any future mold issues ?

Haven't tried mixing both in a spray. I have used (during watering) the peroxide at 150 ppm to get rid of pythium and it wouldn't hurt to do that once. For cleaning up any existing PM mix 1 tsp. of baking soda, a few drops of vegetable oil and a few drops of dish soap per gallon. It'll last about 2 weeks so if your environment is in better shape it should keep it from coming back.

Note: Spray with your main lights off (I usually leave a T5 on, just turn off my main lights), turn your fans up and let them dry for a couple of hours before turning your primary lights back on. This avoids burning any developing buds or existing buds.

i appreciate the response, i will give that a go, i know ive been kind of freaking out it since i have herd horror storys about havi.g this issue in a greenhouse, ill be moving so this is the last run i can do till i get in the new house so id be really sad if i didnt have anything to hold me over for that long process of moving ... thanks again

alwayslearning777 said:

i appreciate the response, i will give that a go, i know ive been kind of freaking out it since i have herd horror storys about havi.g this issue in a greenhouse, ill be moving so this is the last run i can do till i get in the new house so id be really sad if i didnt have anything to hold me over for that long process of moving ... thanks again

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No problem, I do this regularly. My area has terrible PM outdoor so it gets inside pretty easy (even without pulling outside air, spores can get in on your clothes, shoes etc.). I spray them preventatively in veg and if I can maintain RH below 50% they get through flowering, for the most part. Problem is some strains and even phenos of the same strain can resist it, or get it easily so strain/pheno selection in an area that has PM is important, good luck and hope where you move there's no PM!

I've had good results on light case of PM using in rotation 3-7 days apart in the bloom room with greencure, azamax or einstein oil, milk and water, sulfur or copper early in bloom.

Most importantly remove leaves that show PM before it has a chance to spread..also lower ur RH if possible and clean up the shady areas under the canopy, any old dead
Leaves and branches etc

Early on I have used baking soda with good effect, but in later stages I have used SM 90, which is also a preventative in the sense once it is on the leaves and stalk, the PM cannot spread. It is expensive though. Cut off all affected leaves.and lower buds, as when it starts, it is almost always at the bottom of the plant, where the humidity is highest. Defoliation is not a bad idea if you do it, as air movement is imperative to prevent it. If you use one set of scissors for pruning, I would dunk them in H2O2 to kill any possible spores on the blades after you trim. When you start to do it, if possible move the plant away from other plants, even better to another area (complete isolation even better). as the spores will travel. PM is not the kiss of death, but if it is not controlled early, your plant will be fucked.
Good luck

Shit is horrible... Going to build a sulfur burner soon. Soo tired of dealing with this.

thanks everyone, i was reading about milk and water mix, i wonder if that is just another way to raise the PH.. i feel super lucky i caught it so early but im sure there could be spots i did miss ... the problem i had was my timer for fresh air on was stuck so even whe. the lights were off it was pulling damp air in .. i have removed leafs, waiting for tonight to give them all a spraydown of baking soda and a tid bit of oil .. ill try to re post in a week or so let everyone know if it worked... it was such a small amou.t my phone camera couldnt pick it up good or id add a photo ... it could of been drywall for all i know lol but i am def glad that this site exists lol thanks again

alwayslearning777 said:

thanks everyone, i was reading about milk and water mix, i wonder if that is just another way to raise the PH.. i feel super lucky i caught it so early but im sure there could be spots i did miss ... the problem i had was my timer for fresh air on was stuck so even whe. the lights were off it was pulling damp air in .. i have removed leafs, waiting for tonight to give them all a spraydown of baking soda and a tid bit of oil .. ill try to re post in a week or so let everyone know if it worked... it was such a small amou.t my phone camera couldnt pick it up good or id add a photo ... it could of been drywall for all i know lol but i am def glad that this site exists lol thanks again

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FYI I did try the milk spray using different types of milk and concentrations. After all was said & done about the only thing it did was stink up my room and leave spots on them. In comparison, there's some science behind using baking soda in that it raises PH of the sprayed surface to the point where it can't grow. That's also why you'd have to spray every 2 weeks or so as it wears off and if there are spores left in the room or tracked in again, and the environment has higher humidity, it will start again on susceptible plants. Oversized (for the room) HEPA air cleaners and UV based air cleaners seem to help a bit, problem with these units in a room where you have constant air exchange is they're not as effective.

haha ya i can imagine the milk would start to stink, i have a few carbon filters that ive replaced and still have them on account there giant like up to my chest, i was debating getting another inline fan and using it as a scrubber, idk if id work for spores, and really itll be something i worrie about after the move

Im cruising through flower with 60 too 75% humidity, i rarely get pm and i grow in a closet with no exhaust fans, lucky me =))

damn, thats sweet, outa my three or four years ive never had this happen, im usuialy down in the 30 percents this is the first time its gotten up to 50 so im just assuming thats the cause, ive got two oscolating fans that run too so may of just been braught in on my shirt or something .. weve had sme strange weather up here so who knows.. i think i read someplace that lowering ur humidty the last two weeks of flower will increase resin production

dno if its true cuz i always keep mine pretty low

alwayslearning777 said:

dno if its true cuz i always keep mine pretty low

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Yeah it's true, but my buds grow alright in high humidity, could be worse

PM will still grow in low humidity. Some strains are just more prone to it than others. I've found that plant surface pH plays a greater role than humidity does. For the strains that are more prone to PM, I've found that out of everything I've tried (like low humidity/h202/milk sprays/carbonated soda water/neem etc) nothing tops a sulfer burner. There was an excellent writeup for a diy one. I'll see if I can dig it up for the OP or anyone else needing a cheap but effective sulfer burner. Sulfer is great for creating a surface ph unsuitable for PM, bugs and more. Kinda the "all arounder".

That sucks, I never have found a "solution" only some things to try with limited success.

Potassium bicarbonate + water, sulfur burn BEFORE you start up.

Once plants have it, they never seem to shake it. Once you see it, it's bad already.

SM90, silica, etc, nothing ever seemed to get rid of it.

Sulfur burners (proper ones) are cheap as shit, if you are having issues just get a legit one. It's a coffee can with a little metal heating element that heats up a can that rests inside of the coffee can, with a cute handle to suspend from a hook.

DO NOT BREATHE that shit, evacuate well before exposing yourself just for safety sake.

Far more inexpensive than the $100 burners manufacturers and resellers sell them for.
https://www.icmag.com/ic/showthread.php?t=117056

so i went out and got a few bottles of some PH+ water from the grocery store, I picked the few leaves that I found some on and sprayed everything down real good, its been about ten days and no signs at all!
Until this morning, its been 4 days since I did a mist and this morning I noticed that it came back, once again not bad at all and super easy to miss but its there... Busting out the PH water once again and going to pull those leaves off, I thought humidity was the problem but it is staying at about 30 % and temps are 60 to 73 consistently.
Side note: I just switched to Heavy 16 this crop, and this is the first time I have used a foliar spray, I would hate to say they are related but I have grown this strain multiple times so IDK, it is spring now too though... Is it possible the foliar spray just lowered the ph of the leaves to much and that combined with obviously some spores...
I don't know, it is hardly an issue but it still worries me, I have found ten leaves this time with PM on it or what looked like PM was about to start, I am going to keep up on misting them with PH water and hope it doesn't become an issue

Watch those low temps, PM loves the 60s. Also be careful from here on, IME most sprays will turn white hairs brown PDQ. My go to in veg/early flower was plucking infected leaves then spray with Neem/silicate/ph 7.5 water bi-weekly at lights on, I don't believe light burn from foliar is a real thing, but PM loving a low temp/ high RH (from spraying) lights out environment is...

As you get to week 5-6 of flower if you are still seeing issues be very mindful of the lowest leaves on the bottoms of the lowest buds, I would always see junk trying to creep in from there when I had PM troubles . I got so sick of it I'm growing some PM resistant strains to increase my odds lol ( Dinafem Critical+ 2.0 and Medical Seeds Malakoff). Too soon to tell, but fingers crossed and knock on wood

allrighty, ill adjust my temp and keep it up In the 70s, that is the place I found them is on the lower growth that I should of cut off to begin with, I know this is my last harvest where I am so im really kind of freaking out, im dis-infecting everything I can manually wipe down right now, and going to have to just keep an eye on everything...