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Post Harvest Diseases:: Vegetables:: Cucurbits

Diplodia fruit rot of watermelon and cucumber: Diplodia natalensis
Symptom:
  • Stems and leaves - blight and wilting
  • Fruit - decay appears around the stem
  • Rind becomes slightly darkened, water soaked and light brown later
  • Centre of the spots turn black, cracks and wrinkles

Identification of pathogen:

  • Pycnidia - black and large
  • When young - colourless, thick walled and one celled
  • When mature - dark brown, rough walled and two celled
  • Mode of survival - conidia
  • Mode of spread - wind, farm implements, insects

Management:

  • Scratches and bruises must be avoided
  • Pre cooling after harvest
  • Harvest fruits with long stems
  • Cut ends painted with a fungicide paste - copper sulphate
Watermelon dipliodia fruit rot
Source of Images:
http://aggie-horticulture.tamu.edu/vegetable/files/2012/01/WMD20_20_20.jpg

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