Symptoms:
Tomato mosaic virus (TMV) infected plants have a green/yellow mottled appearance and are usually stunted. Infected fruit may have necrotic brown patches on them.

Control:
The virus is most commonly transmitted by handling or mechanical damage. Workers who smoke may infect plants with virus particles left on their hands after handling cigarettes. A variety of insects can also transmit the disease from infected weeds in the Solanaceae. Avoid planting in a field where infected tomato or tobacco plants were grown, and in greenhouse situations, all pruning equipment should be steam sterilized regularly. Use resistant varieties.