In addition, this key only competently identifies the sweetpotato or silverleaf whiteflies if you use the fourth instar/pupa stage selection. If you key down to the sweetpotato or silverleaf whiteflies using one of the other selections, it is recommended that you obtain some fourth instar/pupa samples and rekey them. Otherwise, take specimens from as many stages as possible to your local county extension office and request a positive identification. Effective control strategies can vary for different whitefly species.