Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension

Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Lettuce and Endive > Fuzzy growth on leaves

Print Icon Email Icon Share Icon

Lettuce and Endive > Leaves > Fuzzy growth on leaves

1 of 2
  • Image: Eastern Tent Caterpillar 1
  • Image: Eastern Tent Caterpillar 2
  • Image: Eastern Tent Caterpillar 3

White Mold (aka lettuce drop)
Sclerotinia sclerotiorum and Sclerotinia minor

  • White cottony mold with small hard, black raisin like fungal structures can be seen at the base of the plant
  • 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
2 of 2
  • Image: Forest Tent Caterpillar 1
  • Image: Forest Tent Caterpillar 2
  • Image: Forest Tent Caterpillar 3

Downy Mildew
Bremia lactucae

  • Fuzzy white growth can be seen on the underside of the leaves
  • Yellow to brown sunken angular leaf spots which are often restricted by leaf veins
  • Leaf tissue around the spots turns yellow
  • Infected leaves often rot from secondary fungi and bacteria
  • Older outer leaves most commonly affected
  • Common in cool wet weather
  • More information on Downy Mildew

Don't see what you're looking for?