Crops
Symptoms on lettuce
- 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.
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- 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 )
Figure 1
Figure 2
Figure 3