Is This Powdery Mildew?

SeniorMoments

SeniorMoments

Well-Known Member
A week away from harvest and just noticing this.
Merry Christmas. :rolleyes:
My humidity has stayed low 40/50%
My temps from 66* to 77*
Great air circulation.
Cannot believe this !
So , I wash my buds after harvest.
4 buckets. Hydrogen chloride. Baking soda / lemon juice . Hot and cold water.
Will this take care of it ?
Should I harvest now , a week early ?
Should I spray the plants with a solution and wait ?
Would hydrogen peroxide or Neems hurt the buds ?
What is the correct path here ?
@Emilya @InTheShed @Pennywise
Both plants have it.
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I'd spray it with a 1% citric acid spray to make sure it doesn't spread before harvest.

That's 500ml distilled water, 5g of food grade citric acid, and 4 pipette drops of dish soap. Scale it up or down as needed.

Spray the whole plant and make sure you get in the spots that are hard to get to. I actually pull the buds away from the stems to make sure I get every surface.

Neem will leave a taste and smell in the buds and I haven't had luck with H2O2 for PM on plants, though I do wash with it.
 
InTheShed said:
I'd spray it with a 1% citric acid spray to make sure it doesn't spread before harvest.

That's 500ml distilled water, 5g of food grade citric acid, and 4 pipette drops of dish soap. Scale it up or down as needed.

Spray the whole plant and make sure you get in the spots that are hard to get to. I actually pull the buds away from the stems to make sure I get every surface.
Click to expand...
Would lemon juice work for citric acid ?
 
I have no idea what the ratio would be, but citric acid is available in the baking section of almost every grocery store. And they'll be closed tomorrow!
 
SeniorMoments said:
Would lemon juice work for citric acid ?
Click to expand...
Yes

For washing I just use 1/4 cup of baking soda and a 1/4 cup of lemon juice into 5 gal bucket LUKE warm water.

2 rinse buckets with luke warm water plain then hang dry trim in 3 days.

No need for Hydrogen Chloride yikes... maybe you meant hydrogen Peroxide??

You dont need the peroxide water kills PM so the washing will tco.

You gotta be on your cleaning game.

Wash your hands before during and after working on plants with PM - best to just remove leaves like the one you pictured and rinse with water and into the garbage.

Remember its the spores that are the problem once you see white on your leaves its already heavily infested.

Also your clothes you can get the spores in and then infect other plants. Be aware of that.

The only thing that I've found to work on PM (and you will get it again) is Sulfur.

There are 2 types - wetable sulfur comes in a concentrate like Safers Fungicide and sulfur vapor.

Sulfur vapor you cannot treat flowering plants or plants past say 3rd week in flower. Can switch to the wetable version.

Sulfur vapor requires a vaporizer cost you about 90 bucks - its what the pros use and its completely organic (sulfur is an element).

GL - this is a pain in the ass to get rid of once in the grow room.

Clean the best you can after this round. Water and soap kills the PM but the spores are left and they need to be cleaned up.

I suggest a vaporizer - after all plants are out of the grow space, clean then run the vaporizer for 3-4 hrs and let room sit closed no ventilation over night.

Side benefit to sulfur:

Plants love it
Pests die (all mites are tco'd as well as pm and molds)
gets rid of your rodents if you have any. They absolutely hate sulfur.
 
bobrown14 said:
The only thing that I've found to work on PM (and you will get it again) is Sulfur.
Click to expand...
I've saved three harvests this year with citric acid spray.

Dinafem doesn't recommend sulfur:
"Sulfur: even if spraying the plants with sulfur is a fairly widespread treatment against powdery mildew, we do not recommend it for cannabis cultivation, as the flowers would preserve the flavour and the aroma of this chemical."

Neither does Marijuana Times:
"Sulfur is generally considered an Organic friendly substance, but don’t use it once you are flowering the crop."

Though I think Van Stank uses sulfur burns (rather than sprays), but that's a much more complicated process (including removing his lights from the tent first). I'm also not sure he would do it a week from harvest.
 
InTheShed said:
I'd spray it with a 1% citric acid spray to make sure it doesn't spread before harvest.

That's 500ml distilled water, 5g of food grade citric acid, and 4 pipette drops of dish soap. Scale it up or down as needed.

Spray the whole plant and make sure you get in the spots that are hard to get to. I actually pull the buds away from the stems to make sure I get every surface.

Neem will leave a taste and smell in the buds and I haven't had luck with H2O2 for PM on plants, though I do wash with it.
Click to expand...
OK. I used your formula.
I trimmed off anything that was obviously bad including the low popcorn buds.
Should I treat again tomorrow?
 
bobrown14 said:
Yes

For washing I just use 1/4 cup of baking soda and a 1/4 cup of lemon juice into 5 gal bucket LUKE warm water.

2 rinse buckets with luke warm water plain then hang dry trim in 3 days.

No need for Hydrogen Chloride yikes... maybe you meant hydrogen Peroxide??

You dont need the peroxide water kills PM so the washing will tco.

You gotta be on your cleaning game.

Wash your hands before during and after working on plants with PM - best to just remove leaves like the one you pictured and rinse with water and into the garbage.

Remember its the spores that are the problem once you see white on your leaves its already heavily infested.

Also your clothes you can get the spores in and then infect other plants. Be aware of that.

The only thing that I've found to work on PM (and you will get it again) is Sulfur.

There are 2 types - wetable sulfur comes in a concentrate like Safers Fungicide and sulfur vapor.

Sulfur vapor you cannot treat flowering plants or plants past say 3rd week in flower. Can switch to the wetable version.

Sulfur vapor requires a vaporizer cost you about 90 bucks - its what the pros use and its completely organic (sulfur is an element).

GL - this is a pain in the ass to get rid of once in the grow room.

Clean the best you can after this round. Water and soap kills the PM but the spores are left and they need to be cleaned up.

I suggest a vaporizer - after all plants are out of the grow space, clean then run the vaporizer for 3-4 hrs and let room sit closed no ventilation over night.

Side benefit to sulfur:

Plants love it
Pests die (all mites are tco'd as well as pm and molds)
gets rid of your rodents if you have any. They absolutely hate sulfur.
Click to expand...
Peroxide. I was out of sorts there for awhile.
 
SeniorMoments said:
Should I treat again tomorrow?
Click to expand...

Only if you think you missed any spots. After 24 hours the PM should be dead, and you can tell because what would rub off when it was PM won't budge after it's dead. If it's coming down in a week you should be good, but since the spores may remain in the fans and crevices in the tent you may have to spray again for any other plants in there.
 
InTheShed said:
Only if you think you missed any spots. After 24 hours the PM should be dead, and you can tell because what would rub off when it was PM won't budge after it's dead. If it's coming down in a week you should be good, but since the spores may remain in the fans and crevices in the tent you may have to spray again for any other plants in there.
Click to expand...
I use a room in the garage . I wiped down every surface and sprayed the citric acid everywhere in the grow space. I left both plants in the garage w/ a fan blowing on them for awhile.
Of course the garage has spores most likely . These plants have milky trichs , just no amber to speak of.
The pistils are predominantly dark and turning in.
Starting week 12 and the breeder says 9 / 10 weeks .
If this PM shows up again , I may chop early.
Damn.
 
Don't chop early, spray again. Like I said, I rescued three harvests earlier this year using it.
 
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