Looks more like mites than a disease.
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I bought this Slc. Jewel Box ‘Dark Waters’ two weeks ago and today I noticed what I fear is mildew on one leaf and maybe a virus on others. I would really appreciate help with diagnosis and treatment. I have very little experience with diseases.
Looks more like mites than a disease.
Increase humidity around this plant. Use insecticidal soap if you have it or you can use an alcohol wipe to clean the underside of the leaves, then rinse with fresh water. I agree with Ray, looks more like spider mites.
cheers,
BD