I came across this thread a few days ago and have been kicking myself. Next year will be a different story!
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The more you know! GI joe! 
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I’m not going to waste my time. I know all I need to know about Powdery Mildew. And I know all I want about you. As I said I’m not here to argue. You might be the expert on PM but refuse to admit it can spread by the wind and instead want to bash me in the name of protecting everybody. Don’t worry you’re the expert and they will listen to you. I stated facts about successful experiments I conducted and you refute the facts. So if you said I’m wrong, then everybody will think I’m wrong, relax!
Yeah been there done that. Sulpher does not eradicate the beast in my circumstances and I’m very skeptical now it’s been going on over 6 months now haven’t taken a single cutting in but I have a few legacy cuts I’m keeping around that got hit last year and the sulpher didn’t wipe it out it just put a bandaid on the inevitable.I found two plants with PM in the area but I don’t even think it could transfer from a peony to a Cannabis plant I removed it so we shall see next grow season.That’s shits Systemic and if sulpher isn’t knocking it out best just to start from scratch and beef up a good IPM management plan and protocol.At this point all I can do is hold back and remove what little pm there is and keep the area sterilized as best as possible.The sulpher does a good job of postponing it pretty much.I have a couple choices here and I’m not a fan of having sulpher on my flower and trying to scramble and make it hash.Going to contain it as much as I can under arrest with alternate periods of potassium bicarbonate and if I lose some I lose it it was going to bugs or mold anyway.If I do it won’t be that much hopefully if this works.
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It’s definitely not systemic. You just have to find where the mildew is re-infesting from! It has to be a source close by, because the mildew can’t travel 6 meters by itself. Did you spray the plants twice two weeks apart?
I see, confirmation bias to the rescue is helping you interpret the study in the way you feel safe. Just remember when the mildew sets in, you can come back here and learn about it, then eradicate it.
If anyone wants to know what the study is about it talks how certain wind speed and water drops can disperse the mildew colony. No shit. Except observations outside prove this dispersal is very localized. If you want to interpret that study as “mildew is blowing in the wind” You are lost.
Sorry to have troubled you.
I guess I’m just lucky then that my neighbors have pm and I don’t? I’ll take the luck, but I think there’s more to it, lol! So weird, we have wind, too!
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I wouldn’t waste my time. Like I said I don’t care and don’t care to be right. My system is working.
No, that’s the problem. Your system will never eradicate a mildew infestation and you refuse to learn. You are definitely wasting your time here and the sooner you realize that, the better off you will be. Then you don’t have to sit here doing mental back flips for my amusement.
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Today we’re going to be enjoying the powdery mildew on a wild aster! Those suckers are everywhere and just dripping with it. I think I’ll do a hydrogen peroxide bath and then I’ll do a sulfur one. I’ll also do a bleach one! ooo eventually I’ll do the sulfuric acid one. lol! Hopefully I don’t pull a boner and get acid on my gear!
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oops sorry about that the measurements are wrong for the sizes! They are much smaller lol! I forgot I had changed objective and didn’t change the settings for measurement.
There you go, a tad more realistic
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later on I’ll go and document the spread of the aster mildew colony, because the asters in the garden are mildew free. So I’ll see how close the closest infected plant is.
ok! So the nearest aster that isn’t infested is 32feet/9.7 meters away. The closest infested plant is 1foot or .3 meters away. So the infestation radius is larger than .3 meters but less than 6 meters. This is in the outdoors open wind and rain, plants all over the place. If I go on a real big hunt and check out all the infestations, I could probably figure out how far it can spread in the outdoor environment. Some interesting details!
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These two images are water scale. In a lot of cases the plant, like a cucumber, will drip water from the edge of the leaf during a vast temperature swing. That lands on a leaf below and looks like a bird took a shit or mildew is on it.
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Here’s motherfucking mildew on a plantain. Mildew lives and spreads… also looks vastly different under the microscope. Water scale is lots of tiny white boulders on there. Mildew…well you know what that looks like by now, under the microscope.
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@JoeCrowe thanks for this thread as well as your other posts, very informative and your data-1st approach is appreciated! Few questions:
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How visible is PM with a black light with the naked eye? Is a microscope required to see the smallest filaments/early colonies? And is there a specific black light nm range for detecting PM? It looks like different UV/Black light flashlights have different nm ranges.
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How noxious is sulfur spray indoors? Does the smell linger for days or weeks? And due to PM’s ubiquity, is it pointless to take plants outside to spray, let dry, then return indoors?
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“never use after an oil-based application” – can you clarify this a bit? If plants have been treated with other oil-based sprays such as ag/mineral/soybean oil, how long before sulfur may be used? And…what happens when 2 oil-based applications collide, do the leaves burn or suffocate?
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i had an ongoing powdery mildew issue in my basement for years. i tried all the generic treatments you read about (h202, potassium bisulfite, labs, sulfur etc) and nothing worked.
i ended up fogging my basement with microban and adding merv13 filters to my air intakes (too small to allow pm spores through) and havent had any pm for like a year now
just fyi for people who are having problems with this
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The mildew glows and the plant doesn’t. No need for microscopes!
The sulfur stinks heh heh especially if you get it on yourself. It’s not noxious like chokes you but it smells like farts. You can spray them in a different area, or put each inside a container to spray in order to keep the sulfur mess local. I just cleaned up any excess that landed on the floor after the mildew was extincted.
It’ll eat holes in your leaves, so you have to wash that application off first.