Encarsia is a parasitic wasp used worldwide for the biological control of greenhouse whitefly (Trialeurodes vaporariorum) + on vegetables and ornamentals. Whitefly adults and nymphs cause damage by sucking sap from plants and excreting honeydew which in turn develops into sooty mould. Encarsia can also parasitise silverleaf whitefly (Bemisia tabaci) but will not attack Ash whitefly.