Potassium bicarbonate

Hobbes

Hobbes

Well-Known Member
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I've been scoping hydro stores in my area and none carry Potassium bicarbonate for powdery mildews.

Does anyone know where to look locally or do you know of a site online that I can order from?

Thanks!

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xtsho

xtsho

Well-Known Member
I eradicated PM outdoors in my garden and yard with weekly foliar sprays of potassium silicate. Anyone in the PNW knows about PM on their roses and cucurbits. The last 2 years I' haven't had any PM on my cucurbits at all. It's now part of my regular IPM. Potassium silicate may be more effective than potassium bicarbonate. I don't know as I haven't done any scientific study. I do know that using it regularly has prevented it from affecting plants that used to be affected by it. If it works like it has been I have no need to use anything else.

You're basically just raising the pH to an alkaline level where the PM cant live. Potassium silicate is a higher pH than potassium bicarbonate. Potassium silicate doesn't have as much potential for a negative phytotoxic reaction after application.
 
bam0813

bam0813

Well-Known Member
xtsho said:
I eradicated PM outdoors in my garden and yard with weekly foliar sprays of potassium silicate. Anyone in the PNW knows about PM on their roses and cucurbits. The last 2 years I' haven't had any PM on my cucurbits at all. It's now part of my regular IPM. Potassium silicate may be more effective than potassium bicarbonate. I don't know as I haven't done any scientific study. I do know that using it regularly has prevented it from affecting plants that used to be affected by it. If it works like it has been I have no need to use anything else.

You're basically just raising the pH to an alkaline level where the PM cant live. Potassium silicate is a higher pH than potassium bicarbonate. Potassium silicate doesn't have as much potential for a negative phytotoxic reaction after application.
Click to expand...
God bless it I knew you told me silicate
 
Kassiopeija

Kassiopeija

Well-Known Member
Potassium Silicate is beneficial in many ways from hardening plant cell walls to make it easier for them to shuttle nutes around
it's the Si responsible for that
also less pH fluctuations
 
Nugbender

Nugbender

Active Member
Just saw a tiny bit of PM which isnt a good sign. Just sprayed some green cure with a wetting agent and will switch off to potassium silicate on the next foliar
 
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