They have been extra bad for tomato growers in the central valley the last couple of years. I understand they are using the Formosa wasp encasia to help control. I never had any white flies until last year. Last year I almost lost my garden to them. Same garden same soil for 15 years. This year just a few. Mary-Anne << white fly or alnost any such pest is almost always due to a lack of something or several "somethings' in the soil. If the soil is adequate, there should not be any such a pest. >>