Lettuce big-vein diseasecauses leaf distortion and ruffling in affectedlettuceplants.
| 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-shapedvirusnamedlettuce big-vein associated virus(LBVaV), which is transmitted by the obligatelyparasiticsoil-inhabitingfungus,Olpidium brassicae.[1]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.[2]
Symptoms
editAffected 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
edit- Grow disease-resistantcultivars.
- Use disease-free healthy seeds.
- Treat withmethyl bromide,chloropicrin,ordazometsolution.
References
edit- ^ab"Big Vein".University of California Integrated Pest Management Program.Retrieved24 June2019.
- ^Sasaya, T., H. Fujii, K. Ishikawa, H. Koganezawa (2008). "Further evidence ofMirafiori lettuce big-vein virusbut not ofLettuce big-vein associated viruswith big-vein disease in lettuce ".Phytopathology.98(4): 464–468.doi:10.1094/PHYTO-98-4-0464.PMID18944196.
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