EMERGENCY!!!! powdery mildew

[charlesweedmore]

In trials I've had great results controlling PM with an aerated compost tea using vermicompost, molasses, kelp meal, pyrophyllite clay powder, rock phosphate; brewed 24 hours for bacteria.

can you give exact ratio ?

 

[Microbeman]

Compost - 2.38%
Molasses - 0.75%
Fish hydrolysate - 0.063%
Kelp Meal - max 0.25%
Rock Phosphate - 0.063%
Pyrophyllite - 0.063%

 

[Pig-Pen]

Neem does wonders and without harm. Wipe down affected area; manual removal. Be sure to clean the whole room well; wipe it all down with a bleach solution and evaluate your ventilation system.

My F13 has really curled under leaves too, but mine has never gotten any PM, even when another strain right beside it has.

 

[charlesweedmore]

thanks microbeman, could that recipe work with only molasses and worm casts ? i cant find other stuffs here.

 

[Microbeman]

Try it but I believe the pyrophilitte clay promoted a bacterial species which was the active anti-PM. There is an online source linked on my page (maybe in the recipes but somewhere). IMO the use of high P promotes the growth of PM. No hard evidence!

 

[maryjohn]

coupla things about powdery mildew...

For one, the spores can't survive wet conditions, so if you can mist all day, it will help (no, i'm not kidding or clueless, and i said wet not moist ). This method has its pitfalls.

The other thing to do is decrease water and increase ventilation. And I mean lots of ventilation and much drier soil. If it's a big space it's tough to do, but with a micro cab you can use a floor fan. Combine that with drier than usual soil, and whatever steps you take will be more effective.

Once you establish control, a weekly dose of neem keeps PM at bay.

 

[Clackamas Coot]

Try it but I believe the pyrophilitte clay promoted a bacterial species which was the active anti-PM. There is an online source linked on my page (maybe in the recipes but somewhere). IMO the use of high P promotes the growth of PM. No hard evidence!

Microboeman

Pyrophyllite is widely used by clay artists as an amendment to their clay mixes and in some glaze mixes. It also is used as a refractory material for kiln builders as well as for the molds used in the glass casting method known as pate de verre

Any large pottery supply company will have this product. It usually runs about $15.00 - $20.00 per 50 lbs. bags. For example Seattle Pottery Supply sells their pyrophyllite for $19.50 per 50 lbs.

If you call a pottery supply house and they seem confused by the term 'pyrophyllite' then ask for 'Pyrax' which is a main 'brand name' for this product. This particular clay and talc are almost identical which is something you might find interesting for testing.

I used to use both/either talc or pyrophyllite clay when I was casting lead crystal (80%) around 1984. The basic formula was 70% of either agent, 15% ultra-fine silica sand and 15% clay for the pate de verre molds.

HTH

CC

 

[Microbeman]

The link on my page is to just such a supplier but the proprietor had tests showing no heavy metal content.

 

[Kal-El]

1 part skim milk to 9 parts water, spray plants every 2 days for a week.

 

[planted1]

you gotta take care of the root problem(s). high humidity and contaminant sources. there are countless solutions to the problem. keeping it away is a whole other battle. taking care of these problems along with things like serenade or a sulfur burner, will make success much simpler. all these things in combination in small doses is your best bet. i use serenade at the beggining of the month and a sulfur burner at the end of the month, i dont have any problems because i keep these things consistent.

 

[SmokeyTheBear]

green cure

 

[RNDZL]

Although I hve avery rarely had molds or fungus I did have a soultion for it

Hydroguard 1 part to 5 parts water worked wonders, did absolutely no harm

I found serenade to be less effective and it stunk

hydroguard is no longer available


With that said last time I got cuts from some friends they expressed PM

I used serenade on ALL the plants and let them dry. PM was still visable on the leaf surface.

I then went and got out the good old SM-90 and used it 1 part to 5 parts water

leaves are clean, smell is tolerable

PH was 9.2 due to the SM-90


I really want to go back to hydroguard, Bacillius Subtillis and Bacillius Amyloiquefaciens were the actve ingredients

clear like water with no descernable smell.

I have very rarely had issues but love to foliar and like to have a preventative, s for now its SM-90


There was a thread describing the use of milk to make similar beneficial to bacillius subtillis

 

[Clackamas Coot]

green cure

The product sold under the name of 'Green Cure' is potassium bicarbonate.

This chemical is sold under any number of names like 'Kaligreen' and 'Milstop' or 'Remedy' and any other names - all of which are potassium bicarbonate.

Sodium bicarbonate (Baking Soda) is about 80% as effective and less than 5% of the cost.

Here's a link to explain things.

I feel that these chemicals are great for washing down the walls in a grow room but have limited effectiveness on the plants themselves. I feel that the application of aerated compost teas, backed up with weekly application of neem seed oil with yucca extract is far, far more effective.

YMMV

CC

 

[RNDZL]

i have pro-tek neem oil, what do you use for yucca extract?

what amounts do you use in your treatment ?

thank you in advance

 

[Clackamas Coot]

I use this product as it's organic and doesn't have the usual preservative benzoate which isn't too good if you're using it to brew aerated compost teas where the goal is to 'grow' aerobic fungai - not kill them! LOL

I add the same amount of yucca extract as I do the neem seed oil. Besides being a great surfactant, it's also a fantastic emulsifier and breaks up the neem seed oil quite well in the water sprayer.

In manufacturing, yucca extract is used in soaps & shampoos (foaming agent), root beer, etc.

The other reason that I use this specific product is the high saponin content.


HTH

CC

 

[maryjohn]

hey clack, thanks for that link. I've been looking for yucca extract.

do you know of anyone using qinoa hulls to make an extract? I only ask because I wanted to grow some, but decided against because to of the processing required to remove the saponins.