Q.what causes white spots on leaves that is not powdery mildew?
I have numerous plants with white spots on the leaves, like radio red salvia, and mint

Downtoearthdigs
Answered on July 29, 2019
White spots could be a fungus, Mealy Bugs or Scale or even sun scorch from overhead watering.
https://www.gardeningknowhow.com/plant-problems/pests/insects/what-is-soft-scale.htm
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