Keep getting Powdery Mildew

Everything new / Tent / fans / pots / stakes and I keep getting PM. My environment is perfect. Only other thing I will do next time is vent my tent to outside. I just can’t catch a break with this pm. Ughhhhhhh. It’s always in flower and never appears on leaves. Always strait for the buds.

What is your humidity?

35 -40 in flower. If it ever spikes it’s like 48

Wouldnt think you would have any issues with numbers like that. You do have an oscillating fan in the tent running at all times right?

Where is your tent? Changing the tent won't help if the location it's located has the PM spores present. They can stay dormant for awhile and PM can still grow even with low humidity.

If you are getting PM then your environment can’t be perfect. I would suggest getting an additional hygrometer to make sure the one you have is accurate. I’m betting you also don’t have enough airflow in the tent to prevent dead air spots.

Read up on sulfur vaporizers.

JoeBlow5823 said:

Wouldnt think you would have any issues with numbers like that. You do have an oscillating fan in the tent running at all times right?

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I have a 4x4 tent with 6 inch fan/ filter with 3 6” isolating fans on 24/7. Tent was put in a different room than normal , I’ve cleaned the tent and equipment every 10 days religiously. So I’m moving in July and went into my attic ( which just had new roof put on 1&1/2 yrs ago to go threw some boxes to throw shit I don’t need away. There is Green and black mold growing on the plywood like crazy. Can this be my problem ??? Can mold like that come down somehow and cause PM. I use to grow in my pool shed / storage shed outside ( concrete slab 24x12 shed ) with no tent. Never had a problem with pm just keeping her cool in summer.

TreeFarmerCharlie said:

If you are getting PM then your environment can’t be perfect. I would suggest getting an additional hygrometer to make sure the one you have is accurate. I’m betting you also don’t have enough airflow in the tent to prevent dead air spots.

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I have 2 digital and a WiFi / Bluetooth one. That’s 3. My environment is perfect my airflow is overkill

TreeFarmerCharlie said:

If you are getting PM then your environment can’t be perfect.

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Once you got it, even low humidity only slows it down.

Sulfur kills it ? Can you sulfur in flower ?

And again could black mold in my attic cause this pm?

SickboyDilligaf said:

And again could black mold in my attic cause this pm?

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No, but that doesn’t mean their isn’t PM up there as well. You really need to do something about that black mold, though, it is extremely bad for you. A buddy of mine started having strange issues years ago where he was constantly getting sick and was losing random splotches or hair. After months of going to a doctor they finally figured out there was black mold in the ceiling that was making him sick. That shit is really bad for you.

Renfro said:

Once you got it, even low humidity only slows it down.

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Even after sterilizing the tent? I’ve never had it and hope I never do.

SickboyDilligaf said:

Sulfur kills it ? Can you sulfur in flower ?

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Sulfur is the end of PM. Not during bud set (unless you like the sulfur flavor lol) but in veg and stretch it's ok. It is the only way to really clean up a room. It gets everywhere.

Do some searches and read up on others results using the sulfur. It's very effective, it's hte only thing I have found that will rid you of PM. I won't run a new grow room without vaping it first.

TreeFarmerCharlie said:

Even after sterilizing the tent? I’ve never had it and hope I never do.

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Once your plants have it you don't get rid of it without the sulfur, you can treat it and slow it down with other products but the instant you stop treating for several days it comes back. Sprays don't get 100% coverage and the sulfur vape does.

The sulfur works by raising the pH of the leaves.

Don't spray the plants after a sulfur burn, don't burn with the lights on, stop all fans and ventilation when you burn. For a room sized grow a 4 - 6 hour vape is all you need, another one in say 4 days and you should be good. If you have equipment in the room it gets "cleaned" too.

I spray neem oil every 3 days. Kills WPM, spider mites, and keeps that shit at bay. During last 4 weeks I stop spraying it cause it leaves an oily residue on buds, that's usually when I have issues... once the neem stops.