Adults and immature stages of the cabbage whitefly (Aleyrodes proletella).

Adult of the greenhouse whitefly

Cabbage whiteflies

Whiteflies on chilli leaf. Adults are about 1mm long.

Adults and eggs of the cabbage whitefly (Aleyrodes proletella).

Whiteflies

Immature stages of the citrus woolly whitefly

Whiteflies on citrus leaf. Adult are about 1mm long.

Close-up of the nymphs of the greenhouse whitefly

Eggs of spiralling whitefly

Whitefly killed by fungus

The tobacco whitefly Bemisia tabaci adult (bottom right) about 1 mm long, beside two Trialeurodes vaporariorum adults.

Silver leaf on squash - Bemisia tabaci - Close observation of the undersides of the leaves will show the tiny yellow/white larval scales and in severe infestations, when the plant is shaken, numerous small white adult whiteflies will flutter out and quickly resettle. These symptoms do not differ appreciably from those of Trialeurodes vaporariorum, the glasshouse whitefly, which is common throughout Europe and also occurs elsewhere.