powdery mildew in 2nd week flowering

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Punjabkush

New Member
Need help on getting rid of Powdery Mold on lower fan leaves. Got 3 ghost train haze clones and 2 bag seed unknown strain. 400 watt hps in a 4x4 using only half that space really though. Temps stay around 72-75 degrees. Humidity is between 40 and 55 rh. How would i get rid of the powdery mold or at least contain organically untill harvest?
 
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budleydoright

Well-Known Member
get rid of the leaves. up circulation. greencure works but fucks up flowers. burn sulpher. I have heard that a metal halide lamp kills PM.
 
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BCOGYODA

Well-Known Member
NO! Don't put peroxide on your plants to kill powder mildew! Look at that article the words "probably best"!! Do not do that especially ever in any concentrated dosages.
And NO do not lower humidity lower than 40%. That will drastically negatively affect the transpiration and metabolizing rate of your plants.

Humidity between 45-55 is optimal.

And NO! don't increase air circulation when you have visible powder mildew problems. That would make even more of the powder mildew airborne and spread the problem like crazy.

If you want a 100% cure for powder mildew buy a product called NOVA. It will get ride of it completely usually with only one use if you completely spray the infected areas. On the odd occasion it will take two doses.

Your temps are a bit low and that could have an effect on powder mildew if those temps are constant and if your night time (lights off) temps are even lower.
 
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Punjabkush

New Member
I washed down the tent with a bleach solution and sprayed down the plants with milk and water spray that i read about that kills PM. Does strains have different reactions to PM because my ghost train haze plants are the ones that i spotted A little white dust on a few lower leaves. I sprayed with neem oil like a week ago and just tried the milk and Water spray .. havent seen any sighs since i sprayed with neem tho. Jus wanted to find a cheap or easy was to get rid of it or contain it.
 
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budleydoright

Well-Known Member
Neem is your friend. In my experience with PM, it spreads fast and takes over in a matter of days. Sounds like your OK.
 
OGEvilgenius

OGEvilgenius

Well-Known Member
BCOGYODA said:
NO! Don't put peroxide on your plants to kill powder mildew! Look at that article the words "probably best"!! Do not do that especially ever in any concentrated dosages.
And NO do not lower humidity lower than 40%. That will drastically negatively affect the transpiration and metabolizing rate of your plants.

Humidity between 45-55 is optimal.

And NO! don't increase air circulation when you have visible powder mildew problems. That would make even more of the powder mildew airborne and spread the problem like crazy.

If you want a 100% cure for powder mildew buy a product called NOVA. It will get ride of it completely usually with only one use if you completely spray the infected areas. On the odd occasion it will take two doses.

Your temps are a bit low and that could have an effect on powder mildew if those temps are constant and if your night time (lights off) temps are even lower.
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Someone's definitely had to deal with PM in BC. The shit is invincible to everything except NOVA and sulfur.

Sulfur does work well but it can fuck your crop up if you use it improperly. Nova is highly inorganic however.

Potassium/Sodium Bicarbonate is pretty much all green cure is and maybe there's something else in it as well but AFAIk it's the active ingredient. It will hold off the mildew for a couple days maybe but it will come back unless you have some variety that isn't immune to everything like we have.

I have a list of the most effective treatments for PM from a University (Nova wasn't tested) and Sulfur I believe was #2 on it. Bicarb was near the bottom (2nd last) in effectiveness.
 
Organic Toker

Organic Toker

Active Member
One word- Pseudomonas.

I have written a thread about it. Fights mildew as well.

If you are looking for a botanical solution, Papaya is a good fungicide. Grind the leaves into a paste( the peel of unripe fruit is good if available) add some soap and water and spray away.
I also tried a method of spraying saline but the observation can't be counted because I did other sprays too. Boil some water with 2-3 teaspoons of salt = saline. Saline usually kills fungus and bacteria, so you might kill some benefecial ones too.

Feel free to correct me if am wrong. My intention was to help.

Peace!
Toker.
 
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