PM in late flower, help....

So I have been dealing with PM for sometime now and am running outta ideas. It only appears late in flower. About week 7. Nothing on the fan leaves, it appears on the sugar leaves close to the buds.
I am running outta things to try. Being that it's late in flower, there are a lot of things I am afraid to spray that late.
H2o2 seems to be the only thing I feel safe using that late. I will use Greencure(potassium bicarbonate) also but it burns the pistols. So I only use it really late in flower when it doesn't matter to me anymore if they get burned..
My next spray-day, I am going to try milk as I have heard good things.

I have twice now took everything down, cleaned and disinfected but only to have it come back. I also bought a dust-shroom to hopefully stop spores from coming in thru my intake.
RH with lights off is around 55%. I have my exhaust fan running 24/7 as well as an oscillating fan. min/max tamps are 70/82d. Plants aren't crammed together or anything. Lots of air flow.

It started over the spring when I brought in a plant from a buddy and didn't do what I should have, and quartineed it. Shit's been lingering ever since.

Only other thing I can think to try is a sulfur burner, but I can't afford it.

Any input or insight would be great.

Lower your RH (especially at lights out)...

Add some uv...

Green cure might get you through to finish but I would chop any that are showing PM. You should be able limp to the finish line and do ok.
I don’t spray anything once I flip.

If you are seeing PM on your sugar leaf you need to increase air movement and probably decrease your RH. Mine are always moving in the wind.

NeWcS said:

So I have been dealing with PM for sometime now and am running outta ideas. It only appears late in flower. About week 7. Nothing on the fan leaves, it appears on the sugar leaves close to the buds.
I am running outta things to try. Being that it's late in flower, there are a lot of things I am afraid to spray that late.
H2o2 seems to be the only thing I feel safe using that late. I will use Greencure(potassium bicarbonate) also but it burns the pistols. So I only use it really late in flower when it doesn't matter to me anymore if they get burned..
My next spray-day, I am going to try milk as I have heard good things.

I have twice now took everything down, cleaned and disinfected but only to have it come back. I also bought a dust-shroom to hopefully stop spores from coming in thru my intake.
RH with lights off is around 55%. I have my exhaust fan running 24/7 as well as an oscillating fan. min/max tamps are 70/82d. Plants aren't crammed together or anything. Lots of air flow.

It started over the spring when I brought in a plant from a buddy and didn't do what I should have, and quartineed it. Shit's been lingering ever since.

Only other thing I can think to try is a sulfur burner, but I can't afford it.

Any input or insight would be great.

Click to expand...

seranade is good to use an safe on flowers

nurrgle said:

Green cure might get you through to finish but I would chop any that are showing PM. You should be able limp to the finish line and do ok.
I don’t spray anything once I flip.

If you are seeing PM on your sugar leaf you need to increase air movement and probably decrease your RH. Mine are always moving in the wind.

Click to expand...

I'll have to put another fan in there(4x44 tent) as maybe there is a dead spot of air.

thumper60 said:

seranade is good to use an safe on flowers

Click to expand...

That smell though.
I've been using this but it doesn't seem to do much
https://southernag.com/residential-products/garden-friendly-fungcde-12x1-pt/

NeWcS said:

That smell though.
I've been using this but it doesn't seem to do much
https://southernag.com/residential-products/garden-friendly-fungcde-12x1-pt/

Click to expand...

gotta wash no matter what ya use

throw it away, never smoke contaminated product it is unhealthy.

If i had PM in flower there is no way I'd consume it without at the very least making some qwiso or high heat rosin out of it first. Even then I'd probably be dubious. Be careful with mold spores man, that shit can be bad.

I just threw out 4oz because of mold, a friend was begging me for it saying he didn't care. Dont smoke mold

FYI, PM can still occur in low RH. Your environment could be low RH but RH and temperature between leaves (specially on indica strain) could be just the perfect environment for PM. Blowing air directly to the plant "could" create what is called the wind chill effect between leaves and depending on the moisture level and temperature can provide another perfect environment for PM.

Air flow should just be air going out and air coming in, just enough to move the air around the plants (the goal here is to move the air and not the plant). I also cut off leaves that are laying on top of each other, otherwise it becomes a moisture trap.

You might have to cut off the infected area to prevent spreading the pores and since you have this ongoing problem, you might want to consider preventive maintenance as part of your routine in your next grows.

I already have a fan blowing across the canopy. I just ordered another one to blow underneath. Hopefully that'll help. Its only a 4x4 so I'd assume it'd have to.

After researching and talking to a local bio-chem guy from a reputable local cannabis chain, I was told h2o2 is just fine to spray up until harvest. He said they use Zerotol 2.0. Which looks to be 27.10% h2o2 and 2% Peroxyacetic Acid. Looks like h2o2 and vinegar'ish. But I can't afford to pay that much extra just for Peroxyacetic Acid when 29% h2o2 hydro stuff is a fraction the price. It just means driving to the city and getting it. blah.