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Thanks Caddie, and nice to see you around!The Candida seed project is looking good.
Good question con. And congrats on post #35,000!
Thanks Absorber, you made it to the top of the page!
WooHoo! Would Now be a good time to test the 1 part Whole Milk, 9 parts water solution?Okay while we continue to wait for pollen, here is a Tuesday update on the potassium bicarbonate for powdery mildew tests I've been running for the last few weeks. And let me preface it by saying I have not been using distilled water, so I may re-run this all again once I get a new bottle.
My first search was to find what the industry standard dilution was (and farmers don't use distilled water when they spray their fields), and I came across a product called Armicarb which is potassium bicarbonate, and it's dilution rate is listed at 2.5 to 5 lbs. per 100 gallons.
Here's the math on that:
2.5lbs/100 gallons = 1lb/40 gallons = 0.025lbs/gallon = 11.34g/3.8L = 0.3% solution. Feel free to check my math!
So I mixed up a .3% and a .6% solution and tested it on some branches of the old Candida mother that I've been intentionally growing PM on. Neither had any effect.
At that point I looked up to see what @Melville Hobbes was using for his dilution, and his was a 7% solution! Since I was mixing up 500ml batches I decided to go to a 6% (3g) solution (whole numbers) and see how that did.
Here are the results of that latest test:
20240416_090412 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
20240416_090430 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
So, plenty of PM, not to mention some leaf damage:
20240416_090513 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
20240416_090538 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
Besides the edge curling and burning, the leaves have a dull quality to them that makes the plant look unhealthy. I've decided that potassium bicarbonate (with tap water) is not the answer to my PM issue so I sprayed that plant with neem oil this morning. I may give it another try with 6% in distilled just to confirm, and I'll update you on that if I do.
Thanks for your interest!
Quotes:
Thanks Caddie, and nice to see you around!
Good question con. And congrats on post #35,000!
Thanks Absorber, you made it to the top of the page!
Thanks for the update on the PM.Okay while we continue to wait for pollen, here is a Tuesday update on the potassium bicarbonate for powdery mildew tests I've been running for the last few weeks. And let me preface it by saying I have not been using distilled water, so I may re-run this all again once I get a new bottle.
My first search was to find what the industry standard dilution was (and farmers don't use distilled water when they spray their fields), and I came across a product called Armicarb which is potassium bicarbonate, and it's dilution rate is listed at 2.5 to 5 lbs. per 100 gallons.
Here's the math on that:
2.5lbs/100 gallons = 1lb/40 gallons = 0.025lbs/gallon = 11.34g/3.8L = 0.3% solution. Feel free to check my math!
So I mixed up a .3% and a .6% solution and tested it on some branches of the old Candida mother that I've been intentionally growing PM on. Neither had any effect.
At that point I looked up to see what @Melville Hobbes was using for his dilution, and his was a 7% solution! Since I was mixing up 500ml batches I decided to go to a 6% (3g) solution (whole numbers) and see how that did.
Here are the results of that latest test:
20240416_090412 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
20240416_090430 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
So, plenty of PM, not to mention some leaf damage:
20240416_090513 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
20240416_090538 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
Besides the edge curling and burning, the leaves have a dull quality to them that makes the plant look unhealthy. I've decided that potassium bicarbonate (with tap water) is not the answer to my PM issue so I sprayed that plant with neem oil this morning. I may give it another try with 6% in distilled just to confirm, and I'll update you on that if I do.
Thanks for your interest!
Quotes:
Thanks Caddie, and nice to see you around!
Good question con. And congrats on post #35,000!
Thanks Absorber, you made it to the top of the page!
As I recall milk was the first thing I tried about 5 years ago. I didn't have any luck with it (though others seem to).WooHoo! Would Now be a good time to test the 1 part Whole Milk, 9 parts water solution?
I do the testing so no one else has to...not a lot of folks will intentionally grow PM on their plants!Thanks for the update on the PM.![]()
What's your thoughts on Canola oil for PMI do the testing so no one else has to...not a lot of folks will intentionally grow PM on their plants!
Something in common with my avatar.@Melville Hobbes was using for his dilution, and his was a 7% solution!
Just trying to help where I can!You do a lot of testing and I and others appreciate it.![]()
In flower I try to avoid oil sprays since they tend to brown the pistils and coat the flowers, which is why I stop neem oil when I see pistils. Canola oil may work well but I already use neem in veg. What ratio of canola to water is recommended? I can give it a try instead of neem if you'd like.What's your thoughts on Canola oil for PM
LOL!Something in common with my avatar.
The commercial product I found that uses potassium bicarbonate is called Green Cure. By weight it's 85% potassium bicarbonate. Their recommended dilution rate is 2 tablespoons per gallon.
I believe I was using a teaspoon per litre? Which would be 4.9ml/litre, or 0.49%.
It did cause some leaf burning last summer when I used it too much.
I did get it from your HG post.Just went back and checked.
I used 1/2 a tablespoon per litre, so that's 7.5ml/litre, or 0.75%.
When I told @HashGirl what rate I used I incorrectly converted it to grams, but I did specify that I did it by volume, not weight, and hadn't converted it to metric.
I'd be interested to see the outcome.What ratio of canola to water is recommended? I can give it a try instead of neem if you'd like.
That's a recipe for mites though, yes?I'd be interested to see the outcome.
Post in thread 'MarsHydro Sponsors Giveaway Appreciation Grow Room 2 RDWC' MarsHydro Sponsors Giveaway Appreciation Grow Room 2 RDWC
Apparently it does bothThat's a recipe for mites though, yes?
Oh okay, I'll give it a go but still don't think I'd use it on pistils.Apparently it does both
Yea me either just vegOh okay, I'll give it a go but still don't think I'd use it on pistils.
You made me curious, so I weighed a tablespoon of pb, and it's 16.9g. Or my scale needs to be calibrated.Just trying to help where I can!
In flower I try to avoid oil sprays since they tend to brown the pistils and coat the flowers, which is why I stop neem oil when I see pistils. Canola oil may work well but I already use neem in veg. What ratio of canola to water is recommended? I can give it a try instead of neem if you'd like.
LOL!
I did get it from your HG post.
Maybe I'm reading the math wrong. So if they recommend .5Tbs/L which is 7.4ml/L, and the common conversion is 1ml=1g so that would make it a .74% solution. But it's only 85% potassium bicarbonate, so that would make it a .63% solution?
I guess my mix (3g in 500ml) was a .6% solution rather than a 6% solution [edited above], but either way it didn't work! Given the leaf damage I don't think I'd want to try stronger.
In the Spirit of Medicine Science, I was really hoping you would try it!WooHoo! Would Now be a good time to test the 1 part Whole Milk, 9 parts water solution?
Interesting, I am fortunate to not have Powdery Mildew pressure here in South Texas. Now I don't grow outside due to the fact I live in South Texas, LOL.Okay while we continue to wait for pollen, here is a Tuesday update on the potassium bicarbonate for powdery mildew tests I've been running for the last few weeks. And let me preface it by saying I have not been using distilled water, so I may re-run this all again once I get a new bottle.
My first search was to find what the industry standard dilution was (and farmers don't use distilled water when they spray their fields), and I came across a product called Armicarb which is potassium bicarbonate, and it's dilution rate is listed at 2.5 to 5 lbs. per 100 gallons.
Here's the math on that:
2.5lbs/100 gallons = 1lb/40 gallons = 0.025lbs/gallon = 11.34g/3.8L = 0.3% solution. Feel free to check my math!
So I mixed up a .3% and a .6% solution and tested it on some branches of the old Candida mother that I've been intentionally growing PM on. Neither had any effect.
I did additional sprays at .6% and here are the results of that latest test:
20240416_090412 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
20240416_090430 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
So, plenty of PM, not to mention some leaf damage:
20240416_090513 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
20240416_090538 CD-1 PM after 6% pot.bicarb spray.jpg
Candida sprayed with 6% potassium bicarbonate
Besides the edge curling and burning, the leaves have a dull quality to them that makes the plant look unhealthy. I've decided that potassium bicarbonate (with tap water) is not the answer to my PM issue so I sprayed that plant with neem oil this morning. I may give it another try with 6% in distilled just to confirm, and I'll update you on that if I do.
Thanks for your interest!
Quotes:
Thanks Caddie, and nice to see you around!
Good question con. And congrats on post #35,000!
Thanks Absorber, you made it to the top of the page!