PA grower's N. sibuyanensis has small dots on leaf undersides, darkening with leaf age—looks like something eating new leaves. Media: LFS/perlite.
Clear pest problem. Bumps = pest biting leaf. Exact ID uncertain. Use contact or systemic insecticide. Contact: repeat 5–10 days until eradicated. Damage permanent but further damage prevented.
Video podcast on safe insecticides/application: youtu.be/lbRCdJ8ZNF0
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