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Cladosporium colocasiae  Sawada,1916  

Cladosporiosis of taro



  • A mushroom widely distributed in Asia, Southeast Asia and Oceania, it is now observed in all the taro production zones of the inter-tropical belt.
  • Dénomination anglo-saxone : Brown leaf spot or ghost leaf spot 
  • Leaf-only disease.
  • Mainly present on water taro ( Colocasia esculenta ), more rarely on taro of the genus Alocassia , it does not seem to affect taro of the genus Xanthosoma .


  • Susceptible botanical family(s)


  • Production areas affected :
Guyana New Caledonia


  • Organs attacked



  • Symptoms :
      • Olive green (fig. 1 and 2) to orange-brown (fig. 3) spots, with a rather diffuse outline, developing on the lower leaves. Circular to irregular, measuring 5 to 15 mm in diameter, they affect the inter-vein tissues of the limbus and converge in places ((fig. 4). Their center is downy at first, becomes necrotic and then takes on a grayish tint.
      • Fairly characteristic orange-brown color of the spots observed on the underside of the leaves.
      • Attacks mostly occur on older leaves, but during severe attacks young mature leaves may show symptoms of the disease.
      • Only the leaves are affected
        • Round, olive green spots, quite numerous on the upper side of the leaf.
        • The spots are orange-brown on the underside of the leaf blade.
        • They are less numerous because all the spots do not necessarily cross the leaf blade (fig. 6, 7 and 8).
  • Signs : septate brown conidiophores bearing lighter conidia are visible with a binocular magnifying glass but more easily with a light microscope (fig. 9 and 10). The conidia are few in number and of various shapes, unicellular or presenting up to 3 partitions, isolated or in short chains, sometimes branched (fig. 11).
  • Possible confusion : Neojohnstonia colocasiae (taro orange spot disease)
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Last change : 07/08/22
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