Pothos Stem Bumps: Scale Insects

All pothos have brown wart-like bumps on stems. Are they bugs? Spread? Cause?

Yes: Scale

Immobile bumps under hard shell. Spread easily (airborne larvae, hitchhiking).

Spray horticultural oil (not cooking oil) thoroughly, top/bottom. Repeat weekly. Dead scale wash off.

Common in offices—predators absent.

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