Symptoms of Myrothecium on Solanaceae

• Organs attacked :

• 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.

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• 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 :

•  Myrothecium spp. reported on Solanaceae : M. roridum (tomato fruit, eggplant) and M. verrucaria (tomato fruit), M. carmichaelii (tomato fruit), etc.