Turnip yellow mosaic virus

Turnip yellow mosaic virus (TYMV) is a Tymovirus of the family Tymoviridae. Susceptible plants are confined almost entirely to the Brassicaceae family. It is readily transmissible by sap inoculation, and is transmitted in the field by flea-beetles. It has been reported from several European countries.

Symptoms
During cool weather, infected plants remain stunted. Symptoms are mild in other Brassicas.

Cauliflower
Symptoms begin as vein clearing, but later on permanent yellow patches develop on older leaves.

Chinese cabbage
Symptoms on Chinese cabbage develop as bright yellow and dark green mosaic patterns.