Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Lettuce and Endive > Discolored leaves
Lettuce and Endive > Leaves > Discolored leaves
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Aster Yellows
Aster yellows phytoplasma
- Plants infected when very young are overall yellow, stunted and may have deformed leaves
- Plants infected when older; center leaves are pale yellow and stunted
- Lettuce has a bitter taste
- Drops of tan milky sap may be present at the midrib of the lower leaves
- Symptoms are most severe in July and August
- More information on Aster Yellows
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Calcium deficiency
- Leaves turn yellow and eventually wilt
- More information on Calcium deficiency
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White Mold
Sclerotinia sclerotiorum and Sclerotinia minor
- Plant wilts and outer leaves drop to the ground
- Base of the outer leaves are tan and water soaked
- Rot progresses into the heart of the head
- White cottony mold with small hard, black raisin like fungal structures can be seen at the base of the plant
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Virus
Lettuce mosaic virus, Cucumber mosaic virus and others
- Leaves have a random patches of yellow and green in a mosaic or mottled pattern
- Leaves are misshapen, usually curled and deformed
- Plants may be stunted
- More information on Virus
