Common on certain house plants. Small white (moth like) flies, which multiply quickly and rise in clouds when infested plants are disturbed. Developing scales may also be seen on the undersides of leaves.
Product solution: For fast acting control and long lasting prevention - Provado Ultimate Bug Killer aerosol. For up to 6 weeks useful reduction on houseplants without spraying consider Provado Vine Weevil Killer 2. Use Greenhouse Fly Catchers as a useful preventative and monitoring aid where possible.