How do I recognize, control, and prevent Powdery Mildew?

Thank you so much for your time!
I think I have this down now
Summary:
Get a good scope, properly identify the contaminant, if it a dangerous type, don’t bother trying to fix it, just ditch it.

Thanks again
Shag

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I’ve had some serious respiratory crap this last year. My logic is know “when in doubt, throw it out”. I had the best smelling yard waste in town. I noticed when I quit smoking weed from others, I quit coughing up black crap. Coincidence?

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I think not… :thinking:

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Cool so if I get a bunch of 100x shots with my USB microscope & post them on here someone would be able to spot any possible contam? I just don’t know what I’m looking for. I don’t think I’ve got mold/mildew, I just want to know for sure before I let cancer patients consume it ya know?

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It’s pretty easy to determine if it’s contaminated at a microscopic level. Look for mycelium networks! This is botrytis and nothing else looks like it, it’s the only fungus that’s safe to remediate.

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Are we talking about the things that appear as hairs/strands interconnecting between trichomes? @JoeCrowe

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Definitely! That webbing is dried out botrytis.
Once you take a photo, you can go and compare it to fungus photos online. There actually aren’t many fungi that attacks cannabis plants. penicilluim, cladosporidium, botrytis, mildew, aspergillis. Only the mildew is host specific.

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Optic foliar with atak is great for pm. Besides that I don’t know much had it once my first grow. Started using optic foliar and haven’t had it since. I do suggest the concentrate and mix yourself




Here’s inside the bud by the stem shots. Anything yall see at all? @JoeCrowe apparently this is far as the zoom goes for a $35 microscope.

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I don’t see anything abnormal in those images. Get some buds you know are contaminated, as well, so you can get to know the difference in appearance. Also I went and got a bunch of different mold specimens from moldy leaves and whatnot to see what other strange things grow. Then I’ve got a library of pathogen images to compare to.

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For botrytis you will see a rotten/dark stem.
PM will show on the leave surface first.
Usually where the leaves touch each other or hit the tent.
I saw no signs of mold or Fungus.

If it makes you feel better post a video looking deep into the canopy of your plants
If you want to, your plants look clean but a video will help me be reassured.
If you feel comfortable with an ozone machine, I would like to suggest one.

Make sure it has a timer and make sure you use it properly too.
You may need to do some research into it before you decide if it is right for you.

I own 3 units myself, I even have a commercial unit that was used to remove smell from furniture in a house fire.

But that will remove mold from the air before it even hits your plants.
You never want to be in the same room with it while it is running.
Don’t return to the room until you can not smell ozone any longer.
Run it for about 5 min. come back bout an hour later and check for smell.
No smell or very minimal, it is safe to enter the room.

Pretty simple directions, kinda like electricity, you just need to respect it, not fear it.

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Awesome thanks man! :+1:
I have looked into one & if I ever see any mold/pm ill definitely run one in the grow room.

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Being a commercial grower for many years I’ve about tried them all on edibles. You need to call a rep for these products although they should still be offered on ebay. Magnabon CS2005 and Phyton 35, the latter being pretty pricey. Both products are systemic chemistries, copper sulfate pentahydrate. PM does not flourish once temps get above 90F. Thrives in high humidity.

This may help regarding the A.I. (active ingredient) in A&M approved chemicals for applying to vineyards here in Texas. Cross reference the A.I. to common nursery or big box store products.

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I found this, but dunno how useful:
Mold vs. Mildew: What’s the Difference? – Grainger KnowHow?

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In that article when they talk about “mildew” it’s not the kind that grows on plants. Powdery mildew on plants is a obligate biotrophic ascomycete. It can’t exist without the host plant.
The article talks about mildew that grows on counter tops.

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Thanks. I’m not a grower, so not a plant guy, aka botanist, wotev. Prior to your correcting me i had thot mildew was mildew, and that if it formed like on a counter or cabinet, or wall, it’d migrate to plants. Mucho appreicado for your attention, sir. A lot of ppl who read this will do well to heed your information here. :slight_smile:

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