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Symptoms of Root Knot Nematodes on Lettuce

 

  • Organs attacked :
Roots

Gradually browning white galls, their sizes may vary depending on the species of Meloidogyne .

  • Swellings more or less tortuous and extended along the roots.

  • Leaf chlorosis and leaf wilt occurring during the hottest hours of the day.

  • Reduced plant development and fruit size.

  • Distribution of diseased plants in foci

 

  • Signs : mature females evidenced by making a cross section in the galls. 
  • Possible confusion : very specific root symptoms, beware of legumes not to confuse galls with nodules.
  • Production areas affected :
Guyana
  •  Meloidogyne spp. reported on lettuce :
Last change : 07/07/22
Meloidogyne2
Figure 1
Meloidogyne4
Figure 2
Meloidogyne1
Figure 3
Meloidogyne6
Figure 4
Meloidogyne7
Figure 5
Meloidogyne8
Figure 6
Nematodes-Salade1
Figure 7
Nematodes-Salade2
Figure 8
Nematodes-Salade3
Figure 9