Symptoms of Sclerotium rolfsii on cabbages

• Organs attacked :

• Symptoms :
  • Moist, brown to brown lesions developing on leaves in contact with or near the ground. These lesions are initiated on leaves from or near the base of the main vein (figures 1 and 2) or randomly on the leaf blade (figure 3). They turn brown and gradually become necrotic.
  • The rot sets in and can gradually reach the collar.
  • 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.

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• Signs : dense whitish mycelium covering the damaged organs (figure 3). Smooth structures, rather spherical (1 to 3 mm in diameter), initially white, then fawn to reddish brown, gradually visible within the mycelium: sclerotia resembling mustard seeds (figure 4).

• Affected production areas :