• Ecophyto
  • Logo-Cirad
  • RITA
  • Logo-CA


  • Organs attacked :
Leaves rods Collars


  • Symptoms :
    • A longitudinal or transverse section of the pivot and the stem shows that the vessels show a pink coloration which rapidly evolves to brown.
    • Vitreous and gelatinous marrow, greenish in color, darkening and gradually liquefying under the effect of pectinolytic enzymes (figure 1).
    • Blackish rot in the lower part of lettuces (figure 2).
    • Wilting and collapse of lettuces, particularly close to harvest (figure 3).
    • Dark spots on leaves that progress to a wet, slimy, dark brown to black rot that can spread throughout the head. Affected salads can completely liquefy.
  • Signs : altered tissues often give off an unpleasant odor; sometimes presence of a milky mucus on certain organs.
  • Possible confusion :
  • Production areas affected :
Mayotte Guyana New Caledonia


  • Other Pectobacterium reported on lettuce : Dickeya chrysanthemi (syn. Erwinia chrysanthemi )
Last change : 07/07/22
Figure 1
Figure 2
Figure 3