Powdery ( white ) mildew

dubekoms · Apr 15, 2020

Potassium bicarbonate with a drop of soap will help keep it under control until harvest but will not cure the problem. Raise temps during lights off and make sure you have plenty of airflow.

Kingkongbud · Apr 15, 2020

morugawelder said:
Any of my fellow growers have a good spray solution to stop white powder mildew ?

At least I believe thats what it is , First time in my yrs. has this ever happened , I mixed 2 tsp. apple cider vinegar to qt. water and fouler sprayed a few days ago ,
they looked good till tonight , I'm seeing it again , their 4 weeks into flower .

Thanks !

You dont need to spray any leaves ever. Actually i notice especially the lower leaves live longer without ever letting water touch themcwhen watering. I usually lift the bottom leaves. Maybe you getting mold from too much moisture sitting on the leaves

dubekoms · Apr 15, 2020

Kingkongbud said:
You dont need to spray any leaves ever. Actually i notice especially the lower leaves live longer without ever letting water touch themcwhen watering. I usually lift the bottom leaves. Maybe you getting mold from too much moisture sitting on the leaves

If you have powdery mildew you will want to spray the whole plant down.

Kingkongbud · Apr 15, 2020

dubekoms said:
If you have powdery mildew you will want to spray the whole plant down.

Yea i guess you're right but it should never even get to that point so easy to avoid, ive even had poor ventilation and never encountered that which a fan on the upper canopy directed straight at it min 2 feetvaway and oscillating never encountered mold.

morugawelder · Apr 16, 2020

Kingkongbud said:
You dont need to spray any leaves ever. Actually i notice especially the lower leaves live longer without ever letting water touch themcwhen watering. I usually lift the bottom leaves. Maybe you getting mold from too much moisture sitting on the leaves

I don't get water on them when I water tho , got 3 fans going , plenty of air , just don't get it

morugawelder · Apr 16, 2020

spek9 said:
Please explain how you came to a pollination conclusion without seeing a single picture, or even asking if the "white" powder is yellow (as is pollen).

@morugawelder, please post a picture or two of the issue for a proper diagnosis before you scrap the plants based on an uninformed response.

Here's a little overview of PM: https://www.ilovegrowingmarijuana.com/powdery-mildew/

will do , will get a few pics after work today , but most def. not pollen . I got 5 plants 2 are cookies n cream they are on week 7 , nothing on them
the other 3 are 4 week flower Gelatria , Lemonade , Sweet Inzanity . lot smaller in size also , ( had to flip them sooner ) .

Kingkongbud · Apr 16, 2020

morugawelder said:
I don't get water on them when I water tho , got 3 fans going , plenty of air , just don't get it

Yeah, i dont either, unless your overall humidity is always above 50 percent. Please just check for balls

morugawelder · Apr 16, 2020

Kingkongbud said:
Yeah, i dont either, unless your overall humidity is always above 50 percent. Please just check for balls

Humidity been around 40 % one day it got up to 70 because my timer tot my exhaust failed , but not for very long . The sots are white and flat no bumps at all . Kind of like dried up milk on them . But just my 3 younger girls , the 2 cookies and cream have nothing , must be more resilient

morugawelder · Apr 16, 2020

spek9 said:
Please explain how you came to a pollination conclusion without seeing a single picture, or even asking if the "white" powder is yellow (as is pollen).

@morugawelder, please post a picture or two of the issue for a proper diagnosis before you scrap the plants based on an uninformed response.

Here's a little overview of PM: https://www.ilovegrowingmarijuana.com/powdery-mildew/

here it is bro , I wipe it off with wet paper towels , theres more this is on 2 plants , their not covered yet but I'm sure they will be . I mixed 2 tsp. of apple cider vinegar and sprayed them down . I sprayed them a few days a go , . Gotta be a better homemade mix , they say milk and water , or peroxide ?

spek9 · Apr 16, 2020

morugawelder said:
View attachment 4536070 View attachment 4536072 View attachment 4536074 here it is bro , I wipe it off with wet paper towels , theres more this is on 2 plants , their not covered yet but I'm sure they will be . I mixed 2 tsp. of apple cider vinegar and sprayed them down . I sprayed them a few days a go , . Gotta be a better homemade mix , they say milk and water , or peroxide ?

That is most definitely not pollen. If I'm not mistaken, @Renfro has good advice for ridding a grow room of PM. Hopefully he'll see this soon to be able to respond to let us know if I'm correct that I'm thinking of the right grower, and to be able to provide some assistance.

Renfro · Apr 16, 2020

spek9 said:
That is most definitely not pollen. If I'm not mistaken, @Renfro has good advice for ridding a grow room of PM. Hopefully he'll see this soon to be able to respond to let us know if I'm correct that I'm thinking of the right grower, and to be able to provide some assistance.

Once you have active PM infestation the ONLY thing I have found that will fix the problem, meaning it doesn't keep coming back, is a sulfur vaporizer.

morugawelder · Apr 16, 2020

Renfro said:
Once you have active PM infestation the ONLY thing I have found that will fix the problem, meaning it doesn't keep coming back, is a sulfur vaporizer.

where can they be had and how does this work ? Thanks for your advice ,,,,

Renfro · Apr 16, 2020

morugawelder said:
where can they be had and how does this work ? Thanks for your advice ,,,,

For starters, whats your grow room like, how many sqft?

Wait at least 30 minutes after lights out for the stomata to close.

Turn off all fans, dehumidifiers and whatnot, we want still air.

Cover or remove any CO2 sensors. I would remove LED lights as well.

I wouldn't vape a room with flowering plants, it can impact the flavor of the product.

I always vape a new room before growing in it as insurance. If a room had a PM outbreak previously then a good vape will kill off the spores. I know a lot of growers that have fought PM unsuccessfully for a long time and this was the fix. After two or three treatments the problem is gone.

It's a good idea to plan on leaving the home and taking pets with you when you vape.

Some google searches will net you more information but don't let the pussies scare you off with all their fear mongering. As long as you aren't in the room huffing the vapor it's safe enough.

Renfro · Apr 16, 2020

Oh yeah, don't apply any foliar sprays for 24 hours before or after the vape.

dubekoms · Apr 16, 2020

Renfro said:
For starters, whats your grow room like, how many sqft?

View attachment 4536205

Wait at least 30 minutes after lights out for the stomata to close.

Turn off all fans, dehumidifiers and whatnot, we want still air.

Cover or remove any CO2 sensors. I would remove LED lights as well.

I wouldn't vape a room with flowering plants, it can impact the flavor of the product.

I always vape a new room before growing in it as insurance. If a room had a PM outbreak previously then a good vape will kill off the spores. I know a lot of growers that have fought PM unsuccessfully for a long time and this was the fix. After two or three treatments the problem is gone.

It's a good idea to plan on leaving the home and taking pets with you when you vape.

Some google searches will net you more information but don't let the pussies scare you off with all their fear mongering. As long as you aren't in the room huffing the vapor it's safe enough.

How long does it smell like sulphur after you vape it? I grow in a spare bedroom and would love to vape it but I'm worried it will make the rest of the house reek.

Renfro · Apr 16, 2020

I don't notice the smell after a day but I don't have carpet. Probably not the best for your situation.

dubekoms · Apr 16, 2020

Renfro said:
I don't notice the smell after a day but I don't have carpet. Probably not the best for your situation.

Yeah I figure the smell will stick in the carpet and be a pita to remove. Have you heard of heat treating? I can get the room to 115° in the summer easily for a few hours. Not sure how effective that is in killing the spores.

Renfro · Apr 16, 2020

dubekoms said:
Not sure how effective that is in killing the spores.

Not at all effective.

Renfro · Apr 17, 2020

I have no experience with these but it might be your only really effective option:

Clean Light Pro - UV for Powdery Mildew Control

Perfect for medium to large grow rooms The CleanLight Pro is larger than the hobby unit and is meant for growers with larger grow rooms. The 36 watt lamp allows growers to treat more plants faster than the hobby unit. <stro

www.bghydro.com

JoeBlow5823 · Apr 17, 2020

Ridiculous how much miss information one guy is injecting into this thread while a few people who have a fucking clue try to actually help the guy.

Powdery ( white ) mildew

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