Lettuce big-vein disease

Lettuce big-vein disease
Causal agents	lettuce big-vein associated virus (LBVaV)
Hosts	Lettuce
Vectors	Olpidium brassicae
Treatment	See text

Lettuce big-vein disease causes leaf distortion and ruffling in affected lettuce plants.

This disease was first associated in 1983 with a rod-shaped virus named lettuce big-vein associated virus (LBVaV), which is transmitted by the obligately parasitic soil-inhabiting fungus, Olpidium brassicae. However, in 2000, a second virus, Mirafiori lettuce virus, was found in lettuce showing big-vein symptoms. Furthermore, since the lettuce infected with this virus alone developed big-vein symptoms, it is considered to be a main agent of the big-vein disease.

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