Powdery mildew

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Heather7833

Member
I have an on again, off again problem with pm and I sprayed my plants with potassium bicarbonate mixed with Palmolive when I transitioned into flower. I’ve only seen the odd spot of pm, but it’s still there and I just entered week 4. Can I spray them one more time, maybe using coconut oil instead of Palmolive (which I think damaged some of my fan leaves leaving a white substance on them)? Or should I just cut a leaf off if I see any spots? I had it pretty bad on my last grow, but I bathed them in h2o2 and it worked great. Am I worrying too much here?
 
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Heather7833

Member
I’m growing in a different room, keeping humidity around 40-45 RH and temp around 74. I get that it’s coming from somewhere, but my question is can I treat the leaves, not buds, with potassium bicarbonate using coconut oil to make it adhere or stick to the leaves? I found even the Palmolive to be a bit strong
 
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Kgrim

Well-Known Member
I agree with @ProPheT 216, something's the source. PM was a pain for me for a while, haven't seen it in a long time now. I completely cleaned my dehumidifier, fans, etc with wettable sulfur, (2 tablespoons per gallon) sprayed my plants that were in veg with it twice, (veg is fine, flower is a no no) plants that were in flower, used Zerotol 2.0 to finish the run.
Haven't seen any PM anywhere in my basement room for quite some time. Zerotol will help keep it at bay, and can be used during the flower cycle.
The wettable sulfur kills on contact, should used in veg ONLY, and don't spray if you've used anything oil based, wait at least 30 days, bad things will happen, the sulfur and oil mix will fry your plants.
I sprayed sulfur on a strain that I've had PM problems with for the last 3 years twice in veg in my outdoor swamp grow this year, not one sign of PM.
This combo is fairly inexpensive, and worked on killing it in my basement grow, and kept it off a problematic strain that I've grown for years in swamp.
 
Actinolite

Actinolite

Member
If you keep the spray off the buds you can keep spraying potassium bicarbonate (maybe dilute it more than you would normally, but you can keep doing it). Anything you get on the buds will burn them at this point but if you're careful it may help you limp along till harvest.
Like others have said though, you gotta figure out where it's coming from. Any intake air should be filtered, and after harvest spray down the whole room with Hydrogen peroxide, clean all filters, start everything fresh and hope for the best.
 
cougheeesm

cougheeesm

Well-Known Member
Kgrim said:
I agree with @ProPheT 216, something's the source. PM was a pain for me for a while, haven't seen it in a long time now. I completely cleaned my dehumidifier, fans, etc with wettable sulfur, (2 tablespoons per gallon) sprayed my plants that were in veg with it twice, (veg is fine, flower is a no no) plants that were in flower, used Zerotol 2.0 to finish the run.
Haven't seen any PM anywhere in my basement room for quite some time. Zerotol will help keep it at bay, and can be used during the flower cycle.
The wettable sulfur kills on contact, should used in veg ONLY, and don't spray if you've used anything oil based, wait at least 30 days, bad things will happen, the sulfur and oil mix will fry your plants.
I sprayed sulfur on a strain that I've had PM problems with for the last 3 years twice in veg in my outdoor swamp grow this year, not one sign of PM.
This combo is fairly inexpensive, and worked on killing it in my basement grow, and kept it off a problematic strain that I've grown for years in swamp.
Click to expand...
This ^^^
 
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Heather7833

Member
Kgrim said:
I agree with @ProPheT 216, something's the source. PM was a pain for me for a while, haven't seen it in a long time now. I completely cleaned my dehumidifier, fans, etc with wettable sulfur, (2 tablespoons per gallon) sprayed my plants that were in veg with it twice, (veg is fine, flower is a no no) plants that were in flower, used Zerotol 2.0 to finish the run.
Haven't seen any PM anywhere in my basement room for quite some time. Zerotol will help keep it at bay, and can be used during the flower cycle.
The wettable sulfur kills on contact, should used in veg ONLY, and don't spray if you've used anything oil based, wait at least 30 days, bad things will happen, the sulfur and oil mix will fry your plants.
I sprayed sulfur on a strain that I've had PM problems with for the last 3 years twice in veg in my outdoor swamp grow this year, not one sign of PM.
This combo is fairly inexpensive, and worked on killing it in my basement grow, and kept it off a problematic strain that I've grown for years in swamp.
Click to expand...
Actinolite said:
If you keep the spray off the buds you can keep spraying potassium bicarbonate (maybe dilute it more than you would normally, but you can keep doing it). Anything you get on the buds will burn them at this point but if you're careful it may help you limp along till harvest.
Like others have said though, you gotta figure out where it's coming from. Any intake air should be filtered, and after harvest spray down the whole room with Hydrogen peroxide, clean all filters, start everything fresh and hope for the best.
Click to expand...
this is all great advice and I’ve tried almost everything because I’m limited ( or rather screwed) by the fact I am growing in 2 different rooms in my house on different floors, but the same house nonetheless. Imagine opening your tent door several times a day…… I’ve cleaned and wiped every fan and surface, but you can’t fight nature (and space &$ limitations). So far I’m in week 4 and only a couple spots, but I think I will just wipe all the fan leaves with pb and a wetting agent to be on the safe side. As long as I stay away from the buds, I got it.
One point I have to make is my last grow was too far into flower so I waited until harvest and washed them in hydrogen peroxide (I saw it in a Jose Cervantes video) and it really worked. The buds are a little small but taste really smooth. At least the whole crop didn’t have to go to waste
 
Tolerance Break

Tolerance Break

Well-Known Member
I would recommend hanging a tower fan horizontally in your grow space to lightly move air around the tops of the plants and consider growing plants with either sativa structure or pm resistance. Pineapple Fields is a good example of both, but there are many other options out there. Best of luck!
 
StonedGardener

StonedGardener

Well-Known Member
Heather7833 said:
I have an on again, off again problem with pm and I sprayed my plants with potassium bicarbonate mixed with Palmolive when I transitioned into flower. I’ve only seen the odd spot of pm, but it’s still there and I just entered week 4. Can I spray them one more time, maybe using coconut oil instead of Palmolive (which I think damaged some of my fan leaves leaving a white substance on them)? Or should I just cut a leaf off if I see any spots? I had it pretty bad on my last grow, but I bathed them in h2o2 and it worked great. Am I worrying too much here?
Click to expand...
" Banish Fungicide "......all natural ( geranium oil ) ....can use veg or flower......it's never let me down . Just one ore two sprays actually kills the pm , which so many other products don't kill it . It's great shit stoner dude........just a little covers a shit-ton of surface area .
 
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Treesomewanted77

Well-Known Member
Heather7833 said:
My house is the source lol. I live here with my family and a cat so…….
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If it hasn’t been said try to keep you day and night temp real close to one another. Even if you have to get an oil filled space heater with an ink-bird so you can keep them close to one another. This is what helped me keep from getting it.
 
Kindbud421

Kindbud421

Well-Known Member
Milk and water solution. 1 part milk pasteurized, 3 parts water. Mix and spray. Will stop pm. Leaves coating on leaves denying pm a foothold. And if you’re concerned about the residue you could dip/wash buds like outdoor growers do. I’ve seen 3 bucket wash setups. Dip and swirl 3x then hang to dry. 1/4 cup lemon juice and 1/4 cup baking soda in first bucket. Reverse osmosis in the other two. Dip and swirl for 30 sec in each bucket starting with wash bucket. Then to first rinse bucket then to second rinse bucket. Then gently shake and hang to dry.
 
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Treesomewanted77

Well-Known Member
Kindbud421 said:
Milk and water solution. 1 part milk pasteurized, 3 parts water. Mix and spray. Will stop pm. Leaves coating on leaves denying pm a foothold. And if you’re concerned about the residue you could dip/wash buds like outdoor growers do. I’ve seen 3 bucket wash setups. Dip and swirl 3x then hang to dry. 1/4 cup lemon juice and 1/4 cup baking soda in first bucket. Reverse osmosis in the other two. Dip and swirl for 30 sec in each bucket starting with wash bucket. Then to first rinse bucket then to second rinse bucket. Then gently shake and hang to dry.
Click to expand...
For the wash make sure it’s room temp water because too warm will melt the trics and too cold will make them fall off otherwise the wash works good. I do first bucket with 1 cup baking soda 1 cup lemon juice then second bucket a quart of 3% peroxide and last bucket just water. I wash all my outdoor stuff because everything sticks to these plants.
 
Hobbes

Hobbes

Well-Known Member
Heather7833 said:
I have an on again, off again problem with pm and I sprayed my plants with potassium bicarbonate mixed with Palmolive when I transitioned into flower. I’ve only seen the odd spot of pm, but it’s still there and I just entered week 4. Can I spray them one more time, maybe using coconut oil instead of Palmolive (which I think damaged some of my fan leaves leaving a white substance on them)? Or should I just cut a leaf off if I see any spots? I had it pretty bad on my last grow, but I bathed them in h2o2 and it worked great. Am I worrying too much here?
Click to expand...
.

I use Regalia as a preventative, and a gizmo that produces reactive oxygen species which kills PM in the air and on surfaces.

I had the same problem as everyone goes through and finally solved it with these two fixes.

,

Sage Industries

.
 
Hobbes

Hobbes

Well-Known Member
Treesomewanted77 said:
Do you mean an Ozone generator?
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Not ozone. I don't know what a Reactive Oxygen Species is but it works.

Technology - AirROS by SAGE Industrial (airrosshield.com)

.

How It Works

AirROS by SAGE Commercial air & surface purifiers utilize high voltage and high frequency-controlled pulses, but very low amperage to create non-thermal plasma and generate ROS (Reactive Oxygen Species). ROS are the sanitation/cleaning agents that prevent and destroy Molds (including Powdery Mildew), Viruses, and other Pathogens and control/eliminate Odor in the Air and Surfaces in two stages:
 
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Heather7833

Member
StonedGardener said:
" Banish Fungicide "......all natural ( geranium oil ) ....can use veg or flower......it's never let me down . Just one ore two sprays actually kills the pm , which so many other products don't kill it . It's great shit stoner dude........just a little covers a shit-ton of surface area .
Click to expand...
Yeah, but can I get it in Canada? Thx for the info gonna check it out now
 
weedstoner420

weedstoner420

Well-Known Member
Heather7833 said:
I’m growing in a different room, keeping humidity around 40-45 RH and temp around 74. I get that it’s coming from somewhere, but my question is can I treat the leaves, not buds, with potassium bicarbonate using coconut oil to make it adhere or stick to the leaves? I found even the Palmolive to be a bit strong
Click to expand...
PM actually grows pretty well in medium to low humidity, but it needs high humidity for the spores to germinate on the leaf. Is that 40-45% a constant level? Does it spike when the lights go out or any other time? Do you have good airflow around the plants and in/out of the room? Any pockets of stale air where the humidity might build up?

When it comes to mold and mildew, my thinking is that the first thing to focus on is your environment. Not necessarily killing or sterilizing all spores, but making it so they have a hard time germinating in the first place. Unless you have mildew growing on another plant in your house, your house is no more of a source than all the other indoor growers out there who don't get PM.

Anyway, to answer your original question, coconut oil sounds like a horrible idea because it solidifies at around room temperature. I'd use a couple drops of unscented dish soap instead.
 
O0gieBO0gie

O0gieBO0gie

Member
Heather7833 said:
I have an on again, off again problem with pm and I sprayed my plants with potassium bicarbonate mixed with Palmolive when I transitioned into flower. I’ve only seen the odd spot of pm, but it’s still there and I just entered week 4. Can I spray them one more time, maybe using coconut oil instead of Palmolive (which I think damaged some of my fan leaves leaving a white substance on them)? Or should I just cut a leaf off if I see any spots? I had it pretty bad on my last grow, but I bathed them in h2o2 and it worked great. Am I worrying too much here?
Click to expand...
In your foliar spray, switch out Palmolive for Polysorbate 20(~0.1ml/1000mL) and Coconut oil for Vegetable oil(~0.1ml/1000mL). You can also add some Salicylic Acid(~100mg/1000mL) to help boost your plant immune system.
 
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