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Post Harvest Diseases:: Vegetables:: Tomato

Rhizopus rot: R. stolanifer
  • On tomatoes, Rhizopus rot appears water-soaked and may exude a clear liquid
  • Lesion surface may be covered with thin, cotton-like fungal structures (especially under humid conditions).
  • Dark sporulation may crown the white tuft of Rhizopus.
  • mycelium can infect adjacent fruit through natural openings or mechanical wounds, creating nests of mold and diseased fruit
  Cotton-like fungal structures Dark sporulation Infected tomato

Identification of pathogen:


  • Wound - cause ripe fruit to rot-Fermentative odour
  • Fruit surf. – extramatrical whiskery mycelium, black sporangia
  • Range of temp. 5, 15 and 25°C reaching disease incidence of 97-100% RH


  • Air currents pathogen grows very aggressively even on refrigerated fruit.
  • Pallets and cartons, and it may survive for months in fruit residues left in picking containers and field bins.
  • The length of the surface wetness period needs to be longer at the lower temperatures for disease development


  • Ensure good drainage facility
  • In the greenhouse, maintain a RH of less than 80%, during the night
  • Remove decaying plant material from the plant bed
  • Avoid bruising during packing and transport

Content validator:
Dr. M. Deivamani, Assistant Professor, Horticulture Research Station, Yercaud-636602.

Source of Images:

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