Lettuce big-vein disease
Lettuce big-vein disease causes leaf distortion and ruffling in affected lettuce plants.
| Lettuce big-vein disease | |
|---|---|
| Causal agents | lettuce big-vein associated virus (LBVaV) |
| Hosts | Lettuce |
| Vectors | Olpidium brassicae |
| Treatment | See text |
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.[1] 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.
Symptoms
Affected plants have veins that become large and clear, causing the rest of the leaf to become ruffled. Severely infected plants may fail to form a lettuce head.[1]
Control
- Grow disease resistant cultivars.
- Use disease free healthy seeds.
- Drench the field with methyl bromide, chloropicrin, or dazomet solution.
References
- "Big Vein". University of California Integrated Pest Management Program. Retrieved 24 June 2019.
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