Alfalfa mosaic virus has a very wide host range and can infect over 400 plant species in over 50 plant families. The virus is transmitted by different species of aphids. The virus can be seed transmitted in some specie in plants. Symptoms of alfalfa mosaic include bright yellow mosaic or calico pattern on leaves. Older leaves develop a yellow mottle with enlarged veins. Infected plants may be stunted. The primary source of inoculum is usually the weeds r alfalfa infected with the virus. It is important to rogue out plants infected with the virus as they can be transmitted to vegetable fields by insect vectors. Insect management is crucial to avoid secondary spread. Similarly, effective weed management is necessary so the virus does not live in alternative hosts acting as a reservoir. The virus is usually not big problem in vegetables but can cause outbreak if the variety is susceptible. In Yuma area we have detected the virus in lettuce, datura, spinach, swiss chard, alfalfa etc.