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    Farming & Crop Protection Greenhouse whitefly

    White fly [Trialeurodes vaporariorum]

    Whiteflies are considered to be the most important pests in greenhouses worldwide.

    Pest Profile

    • Symptoms & Diagnosis

      Occurence

      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.

      Treatment

      Combat

      Minute parasitic wasps can be used to parasitize the larvae of the pest. It is best to apply crop protection products at cool temperatures when whiteflies are immobile.