Tomatoes are the primary victim but the virus also attacks 150 other plant species, including beans, melons and beets. Plants affected while small are greatly stunted and die. Plants infected when older turn a dull yellow, the leaves roll upward, fruit production and ripening ceases, and the plant slowly dies. Leaf hopper insects transmit the virus while feeding on the leaves. It may overwinter in several common Arizona weeds, including Russian Thistle.
Prevention is everything, there is no treatment.
Attempts to kill all insect vectors are futile. It only takes one bite from one carrier to transmit the virus. Instead, make your tomatoes unappealing to the leafhoppers. Cover young tomatoes in the spring with a light shade. It is not necessary for the shade cloth to seal the insects out.