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Post Harvest Diseases:: Vegetables:: Cucurbits

Fruit rot: Pythium aphanidermatum
Symptom:
  • Fruits in intimate contact with soil is affected
  • Forms a luxuriant wooly mycelial mat on the affected fruits
  • Skin of the friut shows soft, dark green, water soaked lesions
  • Interior tissue become watery and soft and decaying matter emits a bad odour
Soil contacted infected cucumber Wool mycelial mat on cucumber Wool mycelial mat on pumkin Pythium Rot on Mini Pumpkin
Identification of pathogen:
  • Mycelium - intra-cellular, hyaline and coenocytic
  • Oogonia - smooth and spherical
  • Antheridia - broadly clavate, terminal or intercallary
  • Spreads among the fruits during the storage and transit
  • High moisture and temperature - favours the growth
Management:
  • Soil drenching with copperoxychloride - 0.25%
  • Fruits should be kept away from soil
Source of Images:
http://onvegetables.com/2012/09/06/harvest-rots-and-disorders-of-pumpkins-and-squash/
http://wiki.bugwood.org/HPIPM:Pythium_Fruit_Rot
http://vegetablemdonline.ppath.cornell.edu/DiagnosticKeys/CucurFrt/Pythium/Pyth_pump.htm
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