Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension
www.extension.umn.edu
612-624-1222

Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Lettuce and Endive > Bitter taste

Print Icon Email Icon Share Icon

Lettuce and Endive > Leaves > Bitter taste

1 of 2
  • Image: Codling moth 1
  • - CLICK PHOTO TO ENLARGE -

High temperature

  • Lettuce may taste bitter if grown under high temperatures
  • Plant produces a flower stalk under multiple days of high temperatures (> 75° F)
2 of 2
  • Image: Fruitworms 1
  • Image: Fruitworms 2

Aster Yellows
Aster Yellows Phytoplasma

  • Lettuce has a bitter taste
  • Plants infected when very young are overall yellow, stunted and may have deformed leaves
  • Plants infected when older; only center leaves are pale yellow and stunted
  • 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

Don't see what you're looking for?