Big Vein

Big vein disease 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 andmalformed. Severely affected plants can be so deformed that they are unmarketable. Head lettuce varieties may even fail to form a head. However, infected plants showing less severe symptoms can still be harvested.