Treating powdery mildew with H2O2

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uniquecreations

Member
Kushash said:
IMO the most important thing to fix is the environment that is causing the problem. Heathy plants and a good environment will help keep PM under control and if that doesn't do it then focus on strains that are more resistant to PM.
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My environment is on point since I started my grow , and I didn't get it because of bad environment I got it from the shop where they had problems with PM a week before I took them(which I didn't know at the time as they were not showing signs of PM untill they were about 3 weeks into flowering). And as I've said in my original post , I do keep it under control with h2o2 foliar spray , but just wanted to see if anybody here can recommend watering them with that solution to possibly eliminate PM alltogether.
 
PJ Diaz

PJ Diaz

Well-Known Member
uniquecreations said:
Mr X and a few others told me there's nothing to worry about that it is going to affect my buds ,I have been spraying it for the past 10 days with h2o2 , and for me , it is killing the spores , and I am keeping it under control but it just seems it always find it's way back. You can even watch Jorge Servantes on yt where he's literally washing his buds in h2o2 before drying , and says it won't affect the buds in any way.
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A lot of people say a lot of things. I sprayed my buds with H2O2 once about 10 years ago. Never again. Here's the thing, with H2O2 the spores may be damaged/killed, however their residue remains, unless you water wash it thoroughly post-harvest. But then you are also washing away terps which are water soluble, so back to less tasty buds. If you use a bacteria based fungicide like Southern Ag GFF, the bacteria will eat the mildew. I watched that Jorge Cervantes video like 10 years ago, which is why I tried it myself. I decided it was a mistake after doing a lot more research on the subject. When I use Southern Ag GFF as a preventative at flip to flower, I never see any PM.
 
PJ Diaz

PJ Diaz

Well-Known Member
uniquecreations said:
My environment is on point since I started my grow , and I didn't get it because of bad environment I got it from the shop where they had problems with PM a week before I took them(which I didn't know at the time as they were not showing signs of PM untill they were about 3 weeks into flowering). And as I've said in my original post , I do keep it under control with h2o2 foliar spray , but just wanted to see if anybody here can recommend watering them with that solution to possibly eliminate PM alltogether.
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If you water your soil with H2O2 you will kill your microbes, so no.
 
U

uniquecreations

Member
PJ Diaz said:
A lot of people say a lot of things. I sprayed my buds with H2O2 once about 10 years ago. Never again. Here's the thing, with H2O2 the spores may be damaged/killed, however their residue remains, unless you water wash it thoroughly post-harvest. But then you are also washing away terps which are water soluble, so back to less tasty buds. If you use a bacteria based fungicide like Southern Ag GFF, the bacteria will eat the mildew. I watched that Jorge Cervantes video like 10 years ago, which is why I tried it myself. I decided it was a mistake after doing a lot more research on the subject. When I use Southern Ag GFF as a preventative at flip to flower, I never see any PM.
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PJ thanks for the advice, but since I'm from Europe I can't get a hold of southern ag , dr zymes or safe grows mildew cure, it is all unavailable to me so I'm using what I got.I stoped spraying it with h2o2 instead I'm using the paint brush and cleaning leaf by leaf if I see some new spots with the same mixture I'd normally spray my plants with(water and h2o2),so far so good , I can't say it is not coming back , but at least it is not spreading and I'm keeping it well under control, other than that , plants still look amazing and growing in a steady pace.
 
westcoast420

westcoast420

Well-Known Member
So watering with h202 will do nothing, pm is up in the leaves and plant and watering into the soil will have no affect. If you want to spray with the least impact during flowing just use high ph water, usually around 9 ph. The high ph not only kills the pm but it changes the pm of the leaf surface making it harder for it to grow back. It will however come back if the conditions are right so you would still need to keep up with spraying, even as a preventative.
 
Puff_Dragon

Puff_Dragon

Well-Known Member
Oh I should have mentioned wiping down PM with isopropyl.
It was more effective than H2O2, for me.
Make sure to use it on a tissue ..don't spray it on the plant :)
 
U

uniquecreations

Member
westcoast420 said:
So watering with h202 will do nothing, pm is up in the leaves and plant and watering into the soil will have no affect. If you want to spray with the least impact during flowing just use high ph water, usually around 9 ph. The high ph not only kills the pm but it changes the pm of the leaf surface making it harder for it to grow back. It will however come back if the conditions are right so you would still need to keep up with spraying, even as a preventative.
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And what do you reckon, how often should I spray them?
 
Mr_X

Mr_X

Well-Known Member
i used h202 for my hydroponic dwc. i've used it twice. once for algae and another time for root rot. a solution of water and h202 killed the algae and bacteria by breaking the cell wall. mildew is different since its a fungus that travels through air in the form of tiny spores. when these spores land in damp or humid environments, mildew begins to colonize and grow. its not only your leaves you need to clean. you need to sterilize your environment because there may be more fungus colonies spreading spores. that's why it could come back. i've had a mildew problem before in my grow tent. i fixed the problem by cleaning the leaf with hand soap and water, applying neem oil to prevent further colonizing, sterilizing the environment with clorox wipes, and adding another fan. i suggest using neem oil. thankfully i never had to use neem oil again.
 
U

uniquecreations

Member
Mr_X said:
i used h202 for my hydroponic dwc. i've used it twice. once for algae and another time for root rot. a solution of water and h202 killed the algae and bacteria by breaking the cell wall. mildew is different since its a fungus that travels through air in the form of tiny spores. when these spores land in damp or humid environments, mildew begins to colonize and grow. its not only your leaves you need to clean. you need to sterilize your environment because there may be more fungus colonies spreading spores. that's why it could come back. i've had a mildew problem before in my grow tent. i fixed the problem by cleaning the leaf with hand soap and water, applying neem oil to prevent further colonizing, sterilizing the environment with clorox wipes, and adding another fan. i suggest using neem oil. thankfully i never had to use neem oil again.
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Thanks mr x, very much appreciated!
 
McShnutz

McShnutz

Well-Known Member
I've never sprayed my buds, then again I've never had mites or PM. The only form of prevention I employ is biological. If the right microbes are proliferating they choke out the ability of the wrong ones to ever take hold.

Foliar spray with LAB, cyanobacteria, Purple sulfur bacteria, yeasts. Soil drench with them too. Always include Trichoderma in the soil, your plants SAR will be sky high coupled with the SAR inducing phototropic bacterial from the sprays.
Foliar in veg, so you won't have to in flower. Continue soil drenching

I can't speak for remediation of PM as I've never had it indoors or on cannabis ever.
 
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