White powdery mildew, what do I do?

Real flair for theatrics, lol.

@PlantShepherd so you have no actual evidence it’s harmful in trace amounts…but…it might be. lol “the poisoner” you and Joey be peas in a pod. Perhaps you can collaborate on a cartoon.

Zero confirmed deaths or injuries…but the sky is falling and even 1ppb is deadly poison haha. Birds kill more people per year I think we’ll be OK.

hers what i use

Atak Serenade and green cleaner, there all low, but in order to be effective I have to ipm, so more gets used
vs @vernal using it once every two years, no dog in this hunt, but I dont know which is actually the safer way

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This thread is getting people wound up…no surprise there. Search powdery mildew and you find the same people making the same posts.

Search any forum and you find the same.

Its as if every thread and every forum turns into an eagle 20 bashing. PM is a very contenious subject

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Interestingly, only in the cannabis world is this such a contentious thing. People aren’t so emotionally attached to their tomatoes. The very existence of unapologetic pesticide users offends certain folks’ sensibilities.

E20 overspray will damage succulents and cacti. I sprayed a hanging basket of flowers that was just infested and the overspray just wrecked a couple Dudleya and Echeveria. That’s the worst thing I can say about it. I grow a few of those but I’m not nearly deep enough in the hobby to understand why.

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I can understand the hate of systemic products in plants that are going to be harvested. But how about mother plants. How much is going to be in that 3-6”cutting that will then be grown out to be a 2ft plus plant?

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It’s totally your choice. What you do in your garden is your business. I don’t pay your bills. I have no real say.

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At most a few parts per billion. It isn’t uranium with a 50 year half life.

Here’s a half-life study:

hey vernal when someone else comes in here and says sulfur killed the mildew forever, you are going to change your ways forever right? You’ll be like oh yah! it’s so easy to kill all I need is a little sulfur! Or… are you never going to disprove it, instead keep trying to tell people to use a banned substance? I don’t get it man, we’re teaching the next generation, you want them to learn garbage??

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Weird though that I’ve talked to several people who said sulfur and copper didn’t cure it. So we got you hemmin’ and hawin’ saying it does work, and other people who are objectively better growers than I who specifically said it didn’t.

IDK anyone claiming professional fungicides aren’t effective. You may not like it, but they absolutely do exactly what they’re supposed to.

Banned by who? Canada? Myclobutanil has an actionable limit of 200ppb here in Michigan. It ain’t banned here. I can buy it by the truckload if I were so inclined here in freedomland.

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I stand by my substantiated claim it works. You were here when Growinghigher showed up. Scroll back a few pages and read everything they said and go back and read that university study. I don’t have to prove shit, you have to prove the protocol I said doesn’t work. It’s called falsification and it’s really easy.

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I have a BSc, I understand science just fine.

Problem is, I don’t owe you a study lol. I don’t feel the need to falsify your claims, nor do I care enough to purposefully infect a plant then try to beat it back with micronized sulfur. I’m just here to help people fix their problems in the most expedient way possible.

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Unfortunately another I have to agree with @vernal .
4-5 years ago at another club pm ran rampant thru all of us.
The Sulphur did not work, not for any of us.

Coppers a new one on me , I hear slugs don’t like the stuff.
Does it have to be used in conjuction with the sulphur for pm?

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I’ll explain how it works! You need to encrust the entire plant in sulfur and any leaf. Since the parasite can’t live without it’s host, it will die. Powdery mildew is highly susceptible to sulfur compounds. Don’t leave fallen leaves laying around. The species that live on cannabis could be hosted on mm I think it was asters. So don’t have any of those nearby. you can use sulfur or bordeaux.

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yah you don’t want to try and falsify everything GrowingHigher said either eh? Did you notice what I said about mildew and what the university study said about it matched?

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Who are any of u to tell Joe what he saw with his own eyes?

I hear people struggle with thrips and I got rid of them in one spray. Does that mean im a liar because someone sprayed for months? Maybe i was more thorough. Maybe I caught it earlier before the numbers exploded.

Everyones garden is different.

If the spores live indefinitely then why didnt olereynard get it again being that he uses the same tent and reflectors?

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yah I’ll repeat my story it’s hardcore. This takes place 20 years ago, this guy I know who I based the poisoner cartoons on asked me to produce a couple hundred clones for him. He gave me a stainless steel pot full of cuttings, I took home and rooted. I kept one, it was a berlin clone. I had given the poisoner his clones and things were good the berlin plant was getting big. Suddenly, white powdery mildew on the leaves, so I tossed the plant in the garbage. Little did I know the ascomycete had already spread to my other plants, it was everywhere. So I started deploying poisons including class 4 poison triforine for ornamentals. One plant resisted it a bit. I started reading online. Included tidbits like keep it dry…blah blah. All garbage. Even going to 25% humidity under 1000watt hps failed. to dent it. I couldn’t smoke the buds, so I went to this guy I know who sells weed. He knows me, right and knows I grow weed. He says hey man did you sell all your weed and take the money to come over here and buy my weed? That’s not good economics. I said no man, the powdery mildew took out my crops, I’ve got nothing. So he says just spray those plants good in sulfur i don’t care if you have to grind up pellets and put them in water do it twice two weeks apart, you will never see mildew again. So I did it, and here I am 20 years later telling everyone the same story. It was so easy to try his idea I did it right away and never went back to buy another sack of weed from him. I really appreciated his tip it was top-notch just like his weed.

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It doesn’t have to, I don’t think. But if I was gonna rely on old remedies I’d throw everything at them I could. It’s a common preventative treatment in grapes, bordeaux mix like Joe was talking about. It is a preventative, not a cure, they apply in winter to keep the spores from “germinating”.

It has it’s own side effects, though…copper can build up over the years in the soil and plants and people actually did get sick from copper poisoning before more effective pesticides were invented. People have also told me it burnt the absolute everlovin’ SHIT out of their plants.

@SquirtleSquad by that same logic, who are people to argue when people say they tried sulfur and it didn’t work at all? I got Joe over here says it’s basically a one shot cure, several other people, some of them far better growers than me, that I actually know, who told me it didn’t.

@JoeCrowe Not familiar with triforine. Never used it myself. It’s not really used here in the states. You’re saying it didn’t work at all?

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Every treatment including the most deadly poisons with systemic attributes failed to eradicate the mildew which died in a weekend with sulfur. Funginex is it’s common name.
Also, anyone can fail at eradicating mildew with sulfur if you don’t use the powdery mildew protocol. I’ve seen people spray the plant and leave piles of infected leaves laying around. Don’t be like that.
Another crazy one is where they bring in more infected clones they don’t treat while treating the bigger infected plants. Don’t do that.


here is some mildew to feast on.

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I agree. Its cheap and worth a shot. Let people figure for themselves if it works or not.

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I just Thank the good Lord everyday I dont have to contend with this shit or The Borg.

I’m even gonna stay away from this thread shit makes me cringe just thinking about pm now I’m reading about again.

Bad fuckin juju

Good bye and good luck
You’re gonna need it.

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