Big vein
Big vein disease is a viruslike disease that causes the veins in leaves to become very enlarged and clear.
Such deformities are easily seen if the leaf is examined with the light source behind it. The enlarged
veins cause the rest of the leaf to be ruffled and malformed.
Life cycle
SolutionsLettuce big vein is caused by a viruslike agent vectored by the fungus Olpidium. There is little
that can be done to manage it. Avoid fine-textured, poorly drained soils where big vein has been a problem.
Do not overirrigate. Symptoms are not as severe if air temperatures are above 60 F, so a change in planting
time can help. Some varieties may be more tolerant.
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Clearing
of tissue next to leaf veins
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