How can I effectively control whiteflies, a common pest of tomato plants?

To effectively control whiteflies on tomato plants, you can use methods such as introducing natural predators like ladybugs, using insecticidal soap or neem oil, regularly pruning and removing infested leaves, and using yellow sticky traps to catch adult whiteflies. Additionally, maintaining good plant hygiene and avoiding over-fertilization can help prevent whitefly infestations.