Last year, I had a huge problem with whiteflies in my garden.
Whiteflies undergo complete metamorphosis.
That is the insect hatches from an egg develops into larvae, then to pupae, and finally into an adult. The Whitefly overwinter as a larvae or pupae attached to the leaf. To reduce infestation, at the end of the season remove and destroy all plant debris from previously infested plants. Place whitefly traps, yellow sticky cards, in the flower beds and vegetable garden. This will entrap the whitefly and give you an early warning when they show up.