Powdery mildew and high humidity

GNick55 · Dec 19, 2022

you got it bad, i just had it and barely got to the finish by washing them everyday with a pump sprayer or the hose and using a wet/dry to suck up.. personally the quicker you throw those out and clean up the quicker you’ll be onto a healthier grow.. i’ve had lots of experience with this stuff and i personally think it’s mutating to the treatments..

Stonemason7767 · Dec 20, 2022

Jadam sulfur will kill it.you can make it. there are videos on youtube.it will kill all the rest of your microbes also.after the sulfur has done its job hit your plants and soil with lactic acid bacteria and microbe tea or compost tea.you want a biker gang of microbes waiting for it when it comes back. Don't use sulfur if you are in flower!!!! I spray with the lactic acid bacteria every two weeks.compost or microbes tea once a month.havnt had pm for 3 years you either want a very sterile invironment or a very good microbe heavy inviroment.i prefer the the second choice.when pm spores show up you want them to get there asses kicked and sent on down the road.we have also had good results with milk.i don't think anything can live on the milk except lactic acid bacteria. Defolate and get a uv light to see if you still have it.im not and expert but it is a hell alot easier to prevent it than is to get rid of it.make sure its gone before you flower.

RootsRuler · Dec 20, 2022

+1 on milk for PM.

Stonemason7767 · Dec 20, 2022

If you do make it to the end you can wash your buds in a solution of peroxide and lemon juice to kill any spores before hanging.i don't remember what the ratio is.we did it like 10 to 15 years ago on a farm I worked at.it wasn't a bad out break, but we washed every bud with solution and rinsed with water , including the infected plant.it all passed testing after cure. I will be rooting for you!pm sucks!!!! it can live in your clones and mothers and not show itself.so be carefull what you keep for next grow

GuySmiley · Dec 20, 2022

I bought a 50 pint dehuey last year and plugged it in for a test run. Within a few minutes, it was blowing out HOT, dry air.
Never realized the heat they generate when they're working. If you decide to use one, be prepared to deal with all the heat they add to your grow room.

ninjadip · Dec 20, 2022

Curious, will lactose free milk still work on PM? Or is it the lactose that does the magic?

Bluebuddha · Dec 20, 2022

Thanks for all the responses. I've got powdered Sulfur and S. AG liquid Copper Fungicide on the way. I'll be defoliating as well. I'm 100% hydro so no soil to inoculate. I'm using LED so I can use the extra heat from the de-humidifier. I might try the peroxide spray as well. I'm 100% sure it PM now as under a loupe its a perfect match.

Also I'm still in Veg.

SweetLeafGrow · Dec 20, 2022

I had wpm on one plant in my greenhouse this year. One treatment of milk and it was taken care of and the plant finished nicely.

Here is a bit more info, there is lots more all around the internet.

Using Milk to Prevent Powdery Mildew

You don't have to garden long to become acquainted with the disease called powdery mildew, which creates whitish patches on the leaves of many plants. I have found that it can be controlled with regular sprays of milk and water...

www.growveg.com

MIGrampaUSA · Dec 20, 2022

Bluebuddha said:
Thanks for all the responses. I've got powdered Sulfur and S. AG liquid Copper Fungicide on the way. I'll be defoliating as well. I'm 100% hydro so no soil to inoculate. I'm using LED so I can use the extra heat from the de-humidifier. I might try the peroxide spray as well. I'm 100% sure it PM now as under a loupe its a perfect match.

Also I'm still in Veg.

Yes, get your lights off Temps above 72. That should slow down the spread and give the remedies a chance to fix the problems. Best of luck

GNick55 · Dec 20, 2022

milk is best used at full strength, it’s best on outdoor plants as the milk needs the hot sun to be activated properly..

Ponky · Dec 20, 2022

As a side note to the greatness of milk. Add some to ground beef when you cook it for extra tender beef.

I think it's the lacto bacillus that stops the PM.

GNick55 · Dec 20, 2022

Ponky said:
As a side note to the greatness of milk. Add some to ground beef when you cook it for extra tender beef.

I think it's the lacto bacillus that stops the PM.

or the whey proteins

Ponky · Dec 20, 2022

Lactobacillus Serum or LAB is diluted in de-chlorinated water so as not to kill any of the bacteria. It can then be applied to the soil in a watering can or sprayed onto foliage. For vegetable growers, Lactobacillus can be very effective in controlling diseases like Powdery Mildew on Zucchini, Pumpkins and Cucumbers.

I guess there's an extract you can spray. I wonder if anyone knows of where to get some.

MIGrampaUSA · Dec 20, 2022

Southern Ags Garden Friendly Fungicide contains a strain of Bacillus. The exact strain was selected by "Southern Ag" because of its antimicrobial properties. If the PM is not responding to the Bacillus treatment, I'd be more inclined to reach for something along the lines of Bonide's Sulfur Plant Fungicide than more Bacillus. Like @GNick55 said, sometimes these things develop a resistance. PM tends to have less defense if you use several products in a rotation. (Bonide's sulfur can be used as either a spray or dust.) Just keep in mind that many of these products work by altering leaf pH so if you use a bicarbonate based product followed by an acid based product, they will neutralize each other. A better rotation with a sulfur based product would mean something like Dr. Zymes. Both make the leaves more acidic.

Bluebuddha · Dec 28, 2022

I started with Southern Ags Garden Friendly Fungicide, then Bonide Captain Jack's Copper Fungicide, then Bonide Sulfur Plant Fungicide. As a spray then dusted the next day.

Came back after 4 days and all Powdery Mildew has been eradicated. No signs anywhere. I'll continue 1x week.

The Sulfur was very fine when used dry. I had to dust and immediately zip the tent closed while the fans spread the dust.

TSD · Dec 28, 2022

I've used low fat milk with success outdoors, full fat sours, but they get a bath afterthat anyway... I think the milk trick needs the sun to really work properly. Looks like a pretty heavy infestation of pm... might be best to cut your losses and get the environment dialed in. It's really hard to eradicate completely. If you do go to flower, wash your buds in a peroxide soak and rinse twice. Lost Coast plant Therapy is a good organic preventative for various pests and pm in veg.

Powdery mildew and high humidity

Powdery mildew and high humidity

GNick55

Stonemason7767

RootsRuler

Stonemason7767

GuySmiley

ninjadip

Bluebuddha

SweetLeafGrow

Using Milk to Prevent Powdery Mildew

MIGrampaUSA

GNick55

Ponky

GNick55

Ponky

MIGrampaUSA

Bluebuddha

TSD

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