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Late blight symptoms on tomato

  

  • Organs attacked :
Leaves flowers
Fruits stems

 

  • Symptoms
    • Pale green to brownish green spots on the leaflets at first wet (figure 1). These spots are frequently surrounded by a livid, ill-defined tissue margin (Figure 2).
    • large sectors of the lamina browning and becoming necrotic (figure 3).
    • Brown cankerous lesions on apex, stems and petioles,  more or less extensive, and with irregular outline (figures 4 to 6).
    • Browning of floral bouquets and drop of many flowers.
    • Brown mottling on fruits which are often more or less bumpy. The latter remain relatively firm regardless of the precocity of the attack (FIGS. 7 to 9).
    • Diseased plants are distributed in clusters in the plots; When the conditions are favourable, the progression of the symptoms on the plants and in the culture is dazzling: leaves, twigs, even plants end up necrosing and drying out completely.
       
  • Signs : presence of a discreet and fleeting white down on the affected organs: the underside of the blade of the leaf lesions (figures 10 to 13), the stem, the fruits (figures 9 and 14); this is made up of the sporocystophores and sporocysts of P. infestans.

 

  • Production areas affected
Reunion
Last change : 07/21/22
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Figure 1
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Figure 2
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Figure 3
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Figure 4
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Figure 5
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Figure 6
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Figure 7
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Figure 8
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Figure 9
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Figure 10
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Figure 11
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Figure 12
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Figure 13
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Figure 14