does this look like PM?

I have never had powdery mildew. I'm harvesting right now and just noticed this on some leaves. The harvest was one of my best ones yet but i'm really concerned that it will spread to my other flowering plants. My environment is pretty spot on. 40-50 humidity and low 70's light on to 64-66 F off. So far not seeing it on other plants yet

Yes! It's PWM. If it was on your harvested plants you might want to consider an h2o2 bath before drying. As for spreading them to the other room I would say it's very likely. Not only that but what ever room it came out of needs to be sterilized some way. Deoending on how far into flower you are you could get a sulfur burner to be safe. Then you could treat all your rooms with the burner. The spores get everywhere and all over everything.

shawnery said:

Yes! It's PWM. If it was on your harvested plants you might want to consider an h2o2 bath before drying. As for spreading them to the other room I would say it's very likely. Not only that but what ever room it came out of needs to be sterilized some way. Deoending on how far into flower you are you could get a sulfur burner to be safe. Then you could treat all your rooms with the burner. The spores get everywhere and all over everything.

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how long do I have to burn the sulfur for? My other plants are a few weeks from harvest. I only have 1 flowering room with 3 systems in it

4 hours atleast with your lights off and exhaust fans off and vents closed. You should be fine at your point of flowering with no ill effects.

shawnery said:

4 hours atleast with your lights off and exhaust fans off and vents closed. You should be fine at your point of flowering with no ill effects.

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should that cure it or do I have to burn every few days for a few weeks?

I'd look for any leaves with any evidence of pwm on them and remove them unless you'd end up stripping your tree.

If you really don't see anything I think twice every 3 to 4 days and go from there.

larrypizzimp93 said:

should that cure it or do I have to burn every few days for a few weeks?

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I burn for an hour a day 3 days in a row and then I burn twice a week after that to treat septoria I haven't treated p.m. but that schedule was recommended with the sulfur burning unit and it's worked well for me (you could certainly burn longer initially I have many times) take the advice above, shut everything off while you burn

Also Google Jorge Cervantes Bud washing video on YouTube or you might be able to find it here somewhere you need to wash your bud, it's very simple and you'll be glad you did, good luck