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Old June 19, 2015   #16
Eric02476
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Originally Posted by Bipetual View Post
Green Cure, which is the potassium bicarbonate, says on the label not to store unused solution, so I suspect it does not keep.
It does keep. Just yesterday I received an email from GreenCure (a very friendly and knowledgeable gentleman named Pete) in response to some product use questions I submitted via their website, and he mentioned this as an aside:

"By the way, if you mix more GreenCure than you use you can keep the mix in a well-marked container. The wording on the label about not storing the mix is there because the EPA requires that language on any mix it yourself product."

Makes me wonder how many other products actually can be stored....

Eric
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Old June 19, 2015   #17
Eric02476
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ok,

But with potassium bicarbonate I should have better results?
Is there any known difference between potassium and sodium bicarbonate as fungicide?
Yes. There is a good body of scientific research supporting greater efficacy of potassium bicarbonate vs. sodium bicarbonate as a horticultural fungicide. The information is commonly published by reputable academic extension agencies, such as in this PDF link:

https://www.extension.purdue.edu/ext...bp/bp-69-w.pdf

As others have mentioned, neither bicarbonate is effective unless mixed with a surfactant (spreader sticker). I'm currently using GreenCure, a commercially premixed potassium bicarbonate product, for the sake of convenience.
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Old August 10, 2015   #18
jmsieglaff
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Whipped up a batch tonight and treated my cucubrits which were just starting to get powdery mildew. I was amazed that it seems to work instantly. The leaves that I treated first that had some signs no longer did. I was careful to get tops and bottoms of the leaves. I also treated some flox that always get PM. I'm curious to how things will look tomorrow and in the coming days. Thanks again Ray!
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Old August 13, 2015   #19
ilex
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I burned my plants once with sodium bicarbonate, so be very careful. I would use potassium bicarbonate.
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Old August 13, 2015   #20
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I burned my plants once with sodium bicarbonate, so be very careful. I would use potassium bicarbonate.
I used Rays recipe. 4 tsp potassium bicarbonate, 1 tsp neem and 1 tsp dish soap to 1 gallon of water. The treatment worked well. I will likely reapply this weekend.
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Old August 14, 2015   #21
RayR
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Originally Posted by jmsieglaff View Post
I used Rays recipe. 4 tsp potassium bicarbonate, 1 tsp neem and 1 tsp dish soap to 1 gallon of water. The treatment worked well. I will likely reapply this weekend.
Is that what you used? Because my recipe was 4 tsp. potassium bicarbonate / 1oz (2 Tablespoons) Neem Oil / 2 tsp. Dish Soap.
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Old August 14, 2015   #22
jmsieglaff
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Sorry it was 1 oz Neem, but I did do 1 tsp dish soap. I'll bump up to 2.
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Old August 14, 2015   #23
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Sorry it was 1 oz Neem, but I did do 1 tsp dish soap. I'll bump up to 2.

PM showed up on my squash this week so tonight I mixed up a gallon and sprayed away.
I checked the PH of the mix and it was a little over 8.5 which is where you want it too be. PM spores can't tolerate a leaf surface with a high PH.
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Old March 20, 2017   #24
Nathalie
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I just did this today when my seedlings (2 months old) showed signs of PM, and sprayed them with the same recipe above (Ray's) but omitting the oil as I didn't have it at home...

But now the leaves are wilting and look rather sad (no discolouration, just looks very sloppy). Was this too strong for seedlings, only aimed for mature plants?

Last edited by Nathalie; March 20, 2017 at 06:46 AM.
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Old March 20, 2017   #25
Nathalie
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By the way - it was Sodium bicarbonate, and I saw that 'Ilex' said to be careful as it burned the plants.. maybe that was why this happened, despite I followed the recipe?

Only the bigger lower leaves are wilting, the younger ones in the growing zone are OK.
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Old March 20, 2017   #26
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Originally Posted by Nathalie View Post
By the way - it was Sodium bicarbonate, and I saw that 'Ilex' said to be careful as it burned the plants.. maybe that was why this happened, despite I followed the recipe?

Only the bigger lower leaves are wilting, the younger ones in the growing zone are OK.
You can buy potassium bicarbonate on eBay. I have a 1# bag I got end of last season.
I think they use it somehow in winemaking.
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Old March 21, 2017   #27
Nathalie
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Thanks, I did buy it from Germany through Amazon.de yesterday, 2 lbs bottle. Couldn't find it anywhere in Sweden, only sodium bicarbonate, so that was why I tried that first.

Hope it will be less shocking for the plants!

But I can't see the PM anymore on the stems, which is wonderful! But the bigger leaves wilted away and had to be discarded, the younger leaves are OK, so the plants look line amputated seedlings now, ha.... so I look forward to the potassium bicarbonate to avoid that side effect
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