Whiteflies are considered to be the most important pests in greenhouses worldwide.
White fly [Trialeurodes vaporariorum]
Because whiteflies cannot tolerate low temperatures, they can only survive the winter in heated greenhouses or solariums or in tropical and temporate regions.
Pattern of damage
Adult whiteflies are barely 2 mm long, yellow bodied with white waxy wings. They and the juvenile forms feed on the undersides of leaves by sucking sap, which causes yellow spots to appear. They also excrete sticky honeydew. Honeydew is colonized by sooty molds, which soil the plants and cause a blackening of the leaves. Adult whiteflies can also transmit plant viruses.