Powdery mildew help im in week 7 of flower

I have pm on my ladies-it is on leaves and getting close to buds-
My day time tem is 72 and night is about 68 degrees.
I run the dehumidifier on 24/7 it is built into my 24ooo btu window ac.
Shoulld i run a heater in the room at night? or crank my ac day/night.
thnks for your hel9

headbandrocker said:

I have pm on my ladies-it is on leaves and getting close to buds-
My day time tem is 72 and night is about 68 degrees.
I run the dehumidifier on 24/7 it is built into my 24ooo btu window ac.
Shoulld i run a heater in the room at night? or crank my ac day/night.
thnks for your hel9

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Hi, Quick go buy some OMRI rated Serenade fungicide and brush it on the leaves with a cheap foam paint brush (that way you don't get it all over the buds eh?) Also don't touch the PM covered plants and then any healthy ones, or you'll spread it....then increase the circulation in the space ALOT. I run my exhaust fan 24/7 and a dehumidifier 24/7 along with the two small occilating fans that're going all the time.
A heater can help but also may make it more humid. I think the key is get the stagnant air moving and sucked out as quick as possible. The temp drop at night is allowing moisure to condense on the plants leaves and PM loves that. Also thin and spread the plants if need be. Too packed in and no air can move. I remove lower fan leaves sometimes to help with this. The bigger the plants get the more humid it will get and suddenly you've got white fuzzy leaves.
On the up side if you catch it relatively quickly and change the air circ issues and use Serenade you'll get it out in a few weeks. Otherwise it'll hang on as long as the humidity is high and air circ. is low.
I wouldn't advise using any systemics despite claims the fungicied is out of the plants after a certain amount of time.
The Serenade is a live Baccillus microbe that competes with the PM and is harmless to us. You can use it up to day of harvest. I wouldn't save any of the leaves with PM though, even after treating them. Just save the buds eh?!
Happy Gardening! GrowIT!

Nice,I have pulled 50% affected leafs off and will get seranade tomorow aswell as another fan-i have 40 x 16" ladies in 1gal pots in a 4x6 table and air flow was poor then once we moved plants apart it went to hell and everythings drooping and pined under branches.Argh,im investing in a sulphur burner aswell,but i need to dial in my room first-I was running a sealed room (with no co2 yet,just left door open) and have a spare 8" vortex to use (I have it pulling air out now,janky but works for now)

I have my ac on but only using dehumidifier mode/option on it.
I know of several temp watchdogs that turn on/off units but my ac is 240v
Have a heater i could use but like the idea of an exaust that comes on-how would this work with co2?

you will have to put your exhaust and co2 on different timers. When the co2 comes on your exhaust turns off.

headbandrocker said:

Nice,I have pulled 50% affected leafs off and will get seranade tomorow aswell as another fan-i have 40 x 16" ladies in 1gal pots in a 4x6 table and air flow was poor then once we moved plants apart it went to hell and everythings drooping and pined under branches.Argh,im investing in a sulphur burner aswell,but i need to dial in my room first-I was running a sealed room (with no co2 yet,just left door open) and have a spare 8" vortex to use (I have it pulling air out now,janky but works for now)

I have my ac on but only using dehumidifier mode/option on it.
I know of several temp watchdogs that turn on/off units but my ac is 240v
Have a heater i could use but like the idea of an exaust that comes on-how would this work with co2?

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Hi, Yeah with that many plants in that small a space you almost can't avoid lousy air circ. The dehumidifier has it's work cut out for it. The Vortex is a great fan and it ought to suck the air out in pretty quick time. I'd still invest in at least 2, 12" occilating fans, maybe 4 with that # of plants...
When you use Co2 with an exhaust fan you want to run the co2 when the fan isn't sucking air out obviously. During winter this is a bit hard to do as often the exhaust fan needs to run 24/7. I'm looking at an old HydroFarm Delux climate contoller I have and it's pretty basic. 1 outlet is activated by temp/humidity rise, I'd plug my variable speed controlled vortex exhaust fan into that and let it come on as temps/humidity rose.(at least in the warmer months) I might plug my CO2 into the outlet that is turned off by a rise in temp/humidity. So then the fan comes on and co2 goes off...not so much waste of co2. And the last outlet is always on and so all the circ fans get plugged into that via a decent power strip. Again, at times you won't really have a choice and you'll have to run the exhaust fan 24/7 to overcome the humidity and low air circ. which means no co2. Especially at night when co2 is used most by the plants.
When I first started growing indoors I had my controller set to turn the fans on at 75 degrees but in winter if the temps stay low in the grow space then the fan doesn't come on and you get humidity that eventually condenses on the leaves so needless to say my exhaust fan runs 24/7 starting in late Oct. and usually till late April.
Also as an added fungi precaution, I take my clones and when I transfer them to the flowering space I dunk them in Neem 2 and after that dries I spray them with Serenade if there's any PM around at all.
You can set your air cond./dehumidifier up on a mechanical 220 volt capacity timer if you want the dehumidifier to come on at certain times but at the moment I don't know of any 220 rated climate controllers but I'm sure somebody makes one, probably more of a commercial green house kind of timer or controller though.
I don't use co2 at all and still get great production, basic gardening principles can deliver the fat buds. I wouldn't worry about co2 until you get the air circ/exhaust situation fixed. It'll get easier as the summer warms up. good Luck Happy Gardening! GrowIT!

I had a pm problem and I just used serenade and fixed the problem ultimately by increasing air circulation. Low intake fan, good exhuast, and ocilating fans. When I sprayed my plants I removed them from the room and drenched them. But they we'rent 7 weeks into flower. So brush it on and see what happens.

get out your spray bottle u want 9 parts water 1 part milk , non of that skim lite shit lol has to be Full cream.. spray that slut down.

No disrespect to the previous poster but...I heard that using anything but non fat results in the fat going rancid and really stinking things up. I'd check a couple of other sources before using milk with fat eh? GrowIT!

Thanks for the tips guys i picked up a bottle of DR dowrights pest/diseas controll its naural and an be used close to harvest.Im going to hit my clones/mums/ladies with this tonight and see what happens.

I also pickd up a 70 pint dehumidifier by frigidare.It has a continous drain function.Im running that 24-7 and draining into my res.
I got a few 16" osc fans too and have those movin air now.

Now I want to stop usin my 24kbtu ac's dehumidifier option-hopefully this new frigidare one does the trick.Maybe ill just use it for ac when i need it.

I am trying to figure out how to incorporate the 8" fan as the room is supposed to be a closed room-maybe it needs to stay open for co2 for now-but i will see if i can find a timer for my tank-guess id still have to use the 8" everyso often to pull old air out,but looks like id have to cut hole in
1) door (my door,not landlords)
2) Wall into hallway
3) above window ac( would look janky

What do you think?

Powdery mildew is systemic...it is inside your plant...its herpes for weed ...... there are treatments

Milk, 1/4 cup to 32 oz water....h202 1/4 cup to 32 oz water... these work but you need to apply every 4-5 days..

Greencure works for 10-12 days.....these you wanna use when your in flower as they are organic treatments.... not cures.....all can be used up to the day of harvest...just spray in the morning hours of light so your buds can dry


If you are looking for a cure to PM.... Eagle 20 EW is a systemic fungicide that used on pm....you wanna use this product during veg growth or onset into flower it stays inside your plant for 30 days

Remember all clones or starts taken from an infected plant will pass the PM to it...you usually wont see it until your in flower


Sulfur vapes cover everything your plants walls floor ..stinks like rotten eggs...require repetitive treatments also

colonuggs said:

Powdery mildew is systemic...it is inside your plant...its herpes for weed ...... there are treatments

Milk, 1/4 cup to 32 oz water....h202 1/4 cup to 32 oz water... these work but you need to apply every 4-5 days..

Greencure works for 10-12 days.....these you wanna use when your in flower as they are organic treatments.... not cures.....all can be used up to the day of harvest...just spray in the morning hours of light so your buds can dry

I have the same problem but im in week 5 of flowering purple kush. Could I burn sulfer? would that take care of it? 72 plants. im not trying to butt in would appreciate a reliable answer though. also can the sulfer hurt the bud?

If you are looking for a cure to PM.... Eagle 20 EW is a systemic fungicide that used on pm....you wanna use this product during veg growth or onset into flower it stays inside your plant for 30 days

Remember all clones or starts taken from an infected plant will pass the PM to it...you usually wont see it until your in flower


Sulfur vapes cover everything your plants walls floor ..stinks like rotten eggs...require repetitive treatments also

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Im in week 5 of flowering an 8 week purple strain. I have mold can I use a sulfer burner to get ris of it? will the sulfer affect the bud

Temp is 70 and Humidity is 49% with both units on ,i will turn off the ac/dehumid and see how the frigidare works by itself.

I am hesitant to spray the dr dorights on the week 7 ladies-i was told to remove all lower popcorn/leafs

Gona mix up a batch for mamas/clones now

i try to run a sulpher burner in between runs. since i started doing this i havent seen a single spot 6yrs running.

it will during later flowering .but it truley does kick ass with mold removal.none of the fuginex type sprays stopped it from comming back for me anyway. just a suggestion.good luck

You can run your burner way further into flower without it affecting the plants.Its the only way I know to get rid ofpm and keep your spore count down.Like one guy said its the herpes of weed..Eagle 20 and a burner is what Ive had to do.Ive burnt 4 weeks before harvest with no ill effects.Dont use seranade on your buds,that stuff taste like shit,you might as well just throw your bud in the garbage...The burner wont cure your plants pm but it well help stop the spread of spores and keep it under control.....peace