Necrosis: Lettuce necrotic yellow virus

Symptoms :

• Terminals of the main and auxillary shoots are usually twisted.

• The newest leaves show a bleached, necrotic tip burn.

• The stem, and bases of the larger, older leaves develop reddish brown patches, particularly at the nodes.

• Yellow flecks on veins but the flecks enlarge to produce general chlorosis and kill the leaflet.

• Infected plants wilt and die.

Control :

The disease is considered to be a minor one.