| 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 big-vein virus (MLBVV), was found in lettuce showing big-vein symptoms. Furthermore, since the lettuce infected with LBVaV alone doesn't develop the symptoms while the infected with NLBVV one does, the latter virus 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.
Control
- Grow disease-resistant cultivars.
- Use disease-free healthy seeds.
- Treat with methyl bromide, chloropicrin, or dazomet solution.
References
- ^ "Big Vein". University of California Integrated Pest Management Program. Retrieved 24 June 2019.
- Sasaya, T., H. Fujii, K. Ishikawa, H. Koganezawa (2008). "Further evidence of Mirafiori lettuce big-vein virus but not of Lettuce big-vein associated virus with big-vein disease in lettuce". Phytopathology. 98 (4): 464–468. doi:10.1094/PHYTO-98-4-0464. PMID 18944196.
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