Powdery Mildew

Modern Selections said:

Citric acid seems to be quite effective killing PM. Plain water or soap isn't going to do anything.

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I’ll try to dig up the whole link but it’s possible that water is the only actual element doing anything in any magic spray or product. What’s thecommon denominator. Water on the leaf surface over time inhibit and kill PM, spores and germination.

I spray my outdoor stuff with h202 to kill the pm. Then alternate citric acid and milk to change the ph of the leaf so the pm can't grow there. Be sure to reapply twice a week early morning with the dew. And after every rain

Next year don't plant up against the house to improve airflow. And as others mentioned, trim up the bottoms