Whiteflies and whitefly-infested leaves often have a white or grayish appearance much of which is due to copious amounts of waxy particles produced by adults. Adult male and female whiteflies begin producing waxy particles immediately after emergence and spread these particles over all parts of their body, except for their eyes. The silverleaf whitefly and the greenhouse whitefly form near-circular particles about 1 micrometer ( m) in diameter. The giant whitefly forms waxy fragments 10-30 m in length and 2-2.5 m in width. In all whitefly species, the waxy particles are composed of a mixture of long-chain aldehydes and long-chain alcohols. The female giant whitefly also has two pair of wax plates on her posterior abdomen with which she produces waxy filaments and uses to form the spiral egg trails. The physical and chemical properties of the waxy materials produced by three species of whitefly pests are described, as well as the morphology of the wax plates.