I seem to have this problem ever year but never know what it is or what causes it. It looks like silver patches with tiny black dots on them. The black dots don’t move when I rub the leaves so I dont think its insect feces, I don’t see any bugs, but I do have fungus gnats. It’s starting to spread so I need to get it under control,
its gotten to my sage, basil, oregano and thyme plants, please help!