I have found Neem to be quite a boon at keeping my whiteflies under control in my garden. My hanging fuschia's were plaqued. Mary-Anne << I've had a terrible time with white flies this year, worst than I've had in several years. Along the lines you are mentioning, I found the best way to keep them under control is with strong bursts of water on the underside leaves of the plant. I almost lost some lantana to white flies, but by Spraying the undersides of the leaves withs strong jets of water, 3 or 4 times a week, I was able to rescue them and bring them back to good health. >>