Leaf curl of tomato is spread by

The leaf curl of the tomato is spread by Whiteflies.
Tomato yellow leaf curl virus (TYLCV) is the name given to a complex of geminiviruses infecting tomato cultures worldwide. TYLCV is transmitted by a single insect species, the whitefly Bemisia tabaci.
Over a long distance, the virus is primarily spread through the movement of infected plants, especially tomato transplants.