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Anthracnose: Gloeosporium papayae

Symptoms :

  • The spots on fruits first appear as brown superficial discolouration of the skin which develop into circular, slightly sunken areas and 1 to 3 cm in dia.
  • Gradually the lesions coalesce and sparse mycelial growth appears on the margins of the spots.
  • Under humid conditions, an encrustation of salmon pink spores are released.
  • Infection at early stages of fruit results in mummification and deformation.

Mode of spread and survival :

  • The incipient infection is carried by the fruits from the field.
  • The disease is spread through wind-borne conidia.
  • Conidia are also spread by rain splashes.
  • Severity of the disease on foliage is increased under conditions of excessive moisture.
  • Lesions develop more slowly on the immature fruits than on the mature fruits.

Management :

  • Foliar spraying with carbendazim 0.1 % at 45 days interval or
  • Chlorothalonil 0.2 % at 10 to 15 days interval or
  • Thiophanate-methyl 0.1 % or Mancozeb 0.2 % at 10 days interval controls the disease.
  • Fumigation with bezylisothiocyanate controls post harvest spots and rots

Image source: http://www.padil.gov.au/pests-and-diseases/pest/main/136592#

Circular infectionBrown superficial discolourationAnthracnoseMycelial growth