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northspruce

Powdery Mildew

northspruce
16 years ago

Reporting back on a previous topic... I think it was Sierra posted awhile back to use baking soda and water to control Powdery Mildew (of which there is a LOT this year!) and I said maybe not on roses due to sodium content.

Since then I found a recommendation for exactly that on the ARS website so I figured it must be safe and gave it a shot. It is working GREAT so far. Even after being washed off in 2 hours by a thunderstorm. I reapplied it the next day just in case. Roses and delphiniums responding well so far.

The solution is:

16 oz spray bottle

1/8 tsp baking soda

few drops of dishsoap

fill with water

There's also the milk and water method which I have not tried but I hear is effective.

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