Whitefly is one of the pests greenhouse gardeners know best. The adults are tiny, white and winged. Numbers can build quickly under cover, where it is warm and sheltered. A few on a tomato plant can turn into a serious problem over a summer.
The good news is that whitefly can be managed without reaching for a spray at the first sign. Regular checks, good hygiene and natural enemies all help. This guide covers how to tell the main species apart, what damage to look for and how to keep numbers down.