Questions about powdery mildew

[Dreminem169]

• Can PM live in the soil?
• Would it be safe to reuse the same soil after I culled a plant that was showing PM? Maybe dig out the top layer of soil?
• Will fabric pots hold spores?
• I have other fabric pots that were in the same tent that are still growing plants which are not affected (who knows if spores are present dormantly waiting to pop up)… should I maybe spray/soak the fabric pots down with h202, Apple Cidar Vinegar, sodium bicarbonate, or maybe bleach? if so which solution & concentration?
• Is it true that bleach is not 100% effective & is not an approved method by the EPA? If so, what’s the next best option.
• Is it ok to spray down fans with straight H202?
• If I were to use H202 to clean tent should it be straight 3%, 3% diluted 50/50, or 3% diluted 1/10?
• Do I need a new carbon filter, or just washing the outer filter is ok? best solution to wash filter in?
• Best way to clean the rest of the tent preferably organic (if possible), but not opposed to whatever works best?
• Any recommendations on a HEPA filter? Links?
• I want as much space in tent as possible, so is it ok to run HEPA filter on outside of tent, or it needs to be inside of tent?

 

[namvet25]

1.yes 2.No its better always to use fresh soil. 3.Yes 4.Use a mild soap and bjeach mix to clean pots and wipe fans and filter.No need for hepa filter.Spray entire tent with mild bleach and let air out for a day or so.You can buy organic funjiside at grow shop or Amazon.

 

[Mañ'O'Green]

The spores for Powdery Mildew and all molds are ever present in the environment. After an outbreak the spore load can become very large indeed. The best treatment is prevention by controlling your temperatures and RH.

A milk and water solution sprayed on the troubled plants every 3 or 4 days will help control an outbreak but a commercial product like Southern AG Garden Friendly Fungicide is OMRI and will work better.

If you want to reuse soil you should get a composter and recycle the soil by getting it up to pasteurization temperatures and the re-amending with something like DAZ's Super Soil Amendment.



Then after harvest clean your space with a bleach solution wash the bags and your carbon filter in a bleach solution and you should be good to go for the next crop.

Remember prevention is best. Keep the environment 68°F to 82°F and 40% - 60% RH with plenty of air movement and you should not have mold problems.

 

[Dreminem169]

A milk and water solution sprayed on the troubled plants every 3 or 4 days will help control an outbreak but a commercial product like Southern AG Garden Friendly Fungicide is OMRI and will work better.

So I’ve been spraying milk at a 2/3rds ratio of milk to water & it’s been leaving behind a thick residue that comes off, but not easily. It has to be scrubbed off, won’t come off with just water. Is it ok to spray with the milk solution then like 5 min later spray it off with h20 that way It doesn’t leave behind that residue? Or maybe I should dilute the solution a bit more down to 1/4 milk/h20? just not sure if it will still be effective at the lower dilution rate…

 

[Mañ'O'Green]

So I’ve been spraying milk at a 2/3rds ratio of milk to water & it’s been leaving behind a thick residue that comes off, but not easily. It has to be scrubbed off, won’t come off with just water. Is it ok to spray with the milk solution then like 5 min later spray it off with h20 that way It doesn’t leave behind that residue? Or maybe I should dilute the solution a bit more down to 1/4 milk/h20? just not sure if it will still be effective at the lower dilution rate…View attachment 1394897

I think the ratio is like 1 to 4 or 20% milk. The "residue" is what controls the PM. Leave it on the plant.

 

[Jovinn]

I've had great success with half strength (1.5%) h202. Actually kills it, as opposed to creating an unfavourable environment on the leaf by raising the ph. And leaves no residue.