This 6-page fact sheet discusses the greenhouse whitefly and the silverleaf whitefly (B biotype), their life cycle and the viruses they spread, including viruses in the Geminivirus family [Tomato yellow leaf curl virus (TYLCV) and Tomato leaf curl virus], Cucumber yellows disease caused by Beet pseudoyellows virus (BPYV) and Tomato torrado disease caused by Tomato torrado virus (ToTV). Integrated management methods that reduce or eliminate insecticide use are encouraged. Cultural and biological control methods are outlined in the fact sheet.