White powder on leaves

Ridgeway, VA

I had salvia that was doing good but after blooms dried up, I noticed white powder on leaves. I trimmed off spent blooms but need to know what I can do to get plant healthy again.

Thumbnail by SmilingnVA Thumbnail by SmilingnVA
Powder Springs, GA(Zone 7b)

Mildew would be my first guess.

Rootstown, OH

Powdery mildew

Adelaide, Australia

Yes, powdery mildew... Mix milk with water 1:1 ratio and spray thoroughly all over, or you can use a fungicide

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