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Melon Blight Symptoms

   

  • Organs attacked :

 

Leaves

 

  • Symptoms :
    • Leaf spots initially wet, yellowing, browning, and rapidly becoming necrotic thereafter (Figures 1 to 5). Eventually, a chlorotic border surrounds them (figure 6).
    • These spots sometimes start near the veins which turn brown over a more or less limited portion.
    • Affected tissues become necrotic, and can break down and fall off during very humid periods.
    • Melon leaves dry out completely and remain attached to the plant, erect and curled (Figures 7 and 8).
    • Symptoms progress very rapidly on leaves, plants and in plots.
  • Signs : presence on the underside of the leaf blade of felting whose color varies from light gray to dark mauve (figure 9).
  • Possible confusion :

 

  • Production areas affected :  
Mayotte Reunion New Caledonia
Last change : 07/08/22
Pseudoperonospora-Concombre7
Figure 1
Pseudoperonospora-Concombre9
Figure 2
Pseudoperonospora-Concombre6
Figure 3
Pseudoperonospora-Concombre11
Figure 4
Pseudoperonospora-Concombre10
Figure 5
Pseudoperonospora-Concombre8
Figure 6