Safari has worked well for me.
It’s very important to treat all of your plants at the same time, even if you see no scale.
Both drench and spray everything. The scale can live on the roots.
If a plant is severely infested, remove the mix, pull off any dried sheaths and scrub the leaves and rhizome with a soft toothbrush and alcohol.
Drench the whole plant and roots with Safari and repot.
Insect growth regulators work, but you must repeat at least three times at regular intervals to catch the crawler stage, which is the most vulnerable.
Good luck!
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