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Symptoms of Sclerotium rolfsii on Lettuce


  • Organs attacked :
Leaves Collets
  • Symptoms :
    • Wet, brown lesions developing on leaves in contact with the ground (Figure 1). The rot sets in and gradually affects the collar, certain roots, the base of the petioles.
    • Generalized rot in the apple.
    • Wilting, yellowing of leaves, collapse of plants followed by their progressive decomposition.
    • Affected plants distributed in more or less wide foci.
  • Signs : dense whitish mycelium covering the damaged organs. Smooth structures, rather spherical (1 to 3 mm in diameter), initially white, then tawny to reddish brown, gradually visible within the mycelium: sclerotia resembling mustard seeds.
  • Affected production areas :
Guadeloupe New Caledonia
Last change : 05/09/22
Figure 1
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