Lettuce big-vein associated virus

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lettuce with symptoms of infection by the Lettuce big-vein associated virus (click on image to enlarge it)
Author: Gerald Holmes, California Polytechnic State University at San Luis Obispo
Source: IPM Images

Lettuce big-vein associated virus (LBVV)

This virus is widely distributed and causes the big vein disease on lettuce, it also infects other plants. The symptoms are the striking chlorophyll clearance around the veins, crinkled leaves and a reduced head size, which is often oblong in shape. It is transmitted by the fungus Olpidium brassicae which infect the roots and might form resting spores that pesist in the soil for several years (e.g. see Maccarone, 2013).

Tobacco stunt virus
Lettuce big-vein virus