Remove and destroy heavily infested leaves and plants
Isolate affected plants from healthy ones
Spray the undersides of leaves with a strong stream of water
Apply insecticidal soap to all leaf surfaces
Use neem oil on affected plants
Place yellow sticky traps near plants
Introduce beneficial insects such as ladybugs or lacewings
Keep plants well-pruned to improve airflow
Avoid over-fertilizing with nitrogen
Check plants regularly and repeat treatments as needed