The immobile black dots on your Ficus leaves are scale insects. Remove each visible scale with a cotton swab dipped in straight rubbing alcohol, then spray the entire plant (top and bottom of leaves) with rubbing alcohol every 3–4 days for three weeks to kill hatching crawlers. Persistence is essential. Watch nearby plants for spread.
The immature scale look like tiny white gnats. Early, thorough treatment prevents a major infestation.
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