Isolate the infested plant
Rinse leaves and stems with a strong stream of water
Wipe leaves with a damp cloth
Remove heavily infested leaves
Spray insecticidal soap on all plant surfaces
Spray neem oil on all plant surfaces
Apply horticultural oil to leaves and stems
Repeat treatments every 5 to 7 days
Increase humidity around the plant
Keep the plant out of hot, dry conditions
Clean nearby plants and surfaces
Check the undersides of leaves regularly
Use predatory mites if appropriate
Discard plants that are severely infested