Ophiovirus mirafioriense

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lettuce with big vein symptoms caused by Mirafiori lettuce big-vein virus (click on image to enlarge it)
Author(s): Gerald Holmes, Valent USA Corporation
Source: IPM Images

Ophiovirus mirafioriense

Assigned virus:
Mirafiori lettuce big-vein virus (MLBVV)

MLBVV has four single-stranded RNAs which are negative or ambisense. It causes big-vein symptoms on lettuce, characterized by chlorosis along all veins. The virus is transmitted by the soil-borne chytrid fungus Olpidium virulentus whose resting spores can survive in the soil for many years harbouring the virus.

Vernacular names
• Deutsch: Breitadrigkeit des Salats
• English: big-vein disease of lettuce

The virus was previously called Mirafiori lettuce virus (MiLV).