Strains have PM, should I get rid of them or what

Meast21 said:

Once it gets on a plant can it just go away on its own if the environment is dialed in?

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Not really...the range of environmental conditions under which PM can continue to live/grow are a lot broader than the conditions it needs to germinate. Once it germinates and starts growing, it will continue even after your environment is dialed in.

I'm gonna second (third?) the recommendation to get your environment in check first and foremost. Mold/mildew spores are everywhere, but they can only germinate if conditions are right. Conditions to avoid are: high humidity (over 70%), large swings in temps and humidity, and areas/pockets with little to no air movement, where humidity can build up. If you don't correct the environmental conditions that allowed it to germinate, it's just gonna come back.

Once you get the environmental factors under control, then get rid of all the major sources of spores (i.e. other plants with mildew). You might be able to save them by just removing all the affected leaves/stems, but if it were me I'd be thinking about taking cuttings from leaves/stems with no mildew and starting with a clean slate, at least on the plants that already have it...

Meast21 said:

Thanks for all the help, its got bad reviews on amazon and people said it is really toxic.. Probably just gonna try the sulfur instead bc people said that works.

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That's f'ing bullshit......you ask these geniuses, the toxic nature of this fungicide,
I'm dieing to to know !

I just ran an ozone generator I got off Amazon for 20 minutes or whatever and let it air out. Had my window ac and dehumidifier going so it got in there too. Never saw it again (knock on wood)

Gemtree said:

I just ran an ozone generator I got off Amazon for 20 minutes or whatever and let it air out. Had my window ac and dehumidifier going so it got in there too. Never saw it again (knock on wood)

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Now that's fantastic, that's the first time I've heard about this method . Thanks so much for informing me , I'll definitely check it out!

Gemtree said:

I just ran an ozone generator I got off Amazon for 20 minutes or whatever and let it air out. Had my window ac and dehumidifier going so it got in there too. Never saw it again (knock on wood)

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What's the premise behind this?

Meast21 said:

What's the premise behind this?

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Kills mold spores (after I scrapped everything)

OP, do you have a dehumidifier?

Iv used serenade disease control spray and it worked also lost coast plant therapy spray works ok as a preventative.

also pure crop # 1 may help.

Can PM cause cuttings not to root or to root slowly? I usually get cuttings to root around day 13. Now its day 17 and only half of them have rooted... I also noticed 1 cutting has PM on it.

weedstoner420 said:

OP, do you have a dehumidifier?

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Yes its in my basement outside all of the tents. Humidity is around 50%.

Meast21 said:

Can PM cause cuttings not to root or to root slowly? I usually get cuttings to root around day 13. Now its day 17 and only half of them have rooted... I also noticed 1 cutting has PM on it.

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Anything that affects the health of the plants will make cuttings root slower (and everything else happen slower too).

Meast21 said:

Yes its in my basement outside all of the tents. Humidity is around 50%.

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That's not too bad. What is the humidity range like inside the tents?

weedstoner420 said:

That's not too bad. What is the humidity range like inside the tents?

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I'm not sure I'm guessing low 50's, I grew DWC and have a lot of strong air movement from my in-line fans.... Been growing for 10 years and never got PM until the last 6 months and can't get rid of it.

big bud man 413 said:

Iv used serenade disease control spray and it worked also lost coast plant therapy spray works ok as a preventative.

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Can you spray this in the beginning of flower or only in veg.

Meast21 said:

I'm not sure I'm guessing low 50's, I grew DWC and have a lot of strong air movement from my in-line fans.

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I would check it inside the tents, at least in my basement it's usually ~10-15% higher inside the tent than out.

If you can, get a meter that does min/max, and check what the range is on a typical day. Big swings in temps and humidity are really good for mold/mildew germination...

Meast21 said:

Can you spray this in the beginning of flower or only in veg.

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This is the problem with pm. You eventually get to the point where you cant treat.
If it is there, by harvest time it is rampant regardless of humidity.

Boatguy said:

This is the problem with pm. You eventually get to the point where you cant treat.
If it is there, by harvest time it is rampant regardless of humidity.

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Yah, high humidity is only required for germination. Once it's growing, it will happily thrive at 30% RH with tons of air movement to spread more spores...

weedstoner420 said:

Yah, high humidity is only required for germination. Once it's growing, it will happily thrive at 30% RH with tons of air movement to spread more spores...

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I've controlled it with citric acid, but can't get rid of it.. It always starts on the lower leaves.

weedstoner420 said:

Yah, high humidity is only required for germination. Once it's growing, it will happily thrive at 30% RH with tons of air movement to spread more spores...

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What about burning sulfur?