Figure 1. Preference test under non-choice and free-choice conditions.

A. For non- choice conditions, six leaflets of each nearly-isogenic tomato line (‘Moneymaker’: orange; ABL 14-8: blue) were placed forming a circle in independent trays. B. For free-choice conditions, three leaflets of each line (six leaflets per tray) were placed in an alternate design. C. Petiole leaflets were inserted into a plastic dish (2 cm Ø×1 cm high) with nutritive solution to offer both adaxial and adaxial leaf surfaces to whiteflies. D. Six leaflets per tray were placed abaxial surface down with their tips directed to the center of the circle formed by the leaflets. E. The plastic tray was covered with a plastic lid (25×25×10 cm) with an opening covered with muslin for ventilation.