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Symptoms of Myrothecium on Solanaceae

  

  • Organs attacked :
Leaves

 

  • Symptoms
    • Initially, small circular moist to fatty lesions located on the limbus or its periphery (figure 1).
    • Thereafter, the spots extend, turn brown, and progressively become necrotic (figures 2 and 3).
    • Their center clears up and they reveal discreet concentric patterns and a more or less marked yellow halo (figure 1).
    • They sometimes coalesce and the degraded fabrics dry out, split and eventually fall off; the blade is more or less perforated.
    • Brownish to olive-coloured, irregular spots on tomato fruits, surrounded by a slight depression of the peripheral tissues.
  • Signs : presence of greyish to black sporiferous pads: sporodochia (figure 4). These structures are made up of numerous phialides which form at their end cylindrical conidia, hyaline to slightly olive-coloured.
  • Possible confusion : Sigatoka

 

  • Production areas affected :
Guyana

  

  •  Myrothecium spp. reported on Solanaceae : M. roridum (tomato fruit, eggplant) and M. verrucaria (tomato fruit), M. carmichaelii (tomato fruit), etc.
Last change : 07/08/22
Myrothecium_Tomate
Figure 1
Myriothecium-Aubergine1
Figure 2
Myriothecium-Piment1
Figure 3
Myriothecium-Piment2
Figure 4
Myrothecium-Tomate2
Figure 5