They often are found on lighter colored foliage. To capture the winged whiteflies, place appropriately colored sticky traps just above susceptible plants or around edges of plantings. These traps usually are flat sheets or tape coated with a sticky material that can hold the Insects. Several commercial products designed specifically for insect capture are available from Garden catalogs and greenhouse suppliers. A heavy-weight oil or grease is an acceptable alternative.
Some manufacturers make yellow sticky cards or tapes.
Yellow sticky traps are used both to monitor whitefly populations and to help suppress populations. Monitoring is the most common use, to detect movement of whiteflies into a greenhouse or increases in populations. For whitefly control, place many sticky tape or other traps around the planting. The small parasitic wasp, Encarsia Formosa , has long been used as a biological control for greenhouse whitefly. It develops within the whitefly nymphs.