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Horticultural crops :: Vegetables:: Musk melon and Water melon

Downy mildew: Pseudoperonospora cubensis

Symptoms

  • Itoccurs on cucumbers, squash, muskmelons, and pumpkins and less frequently on watermelons.
  • On cucurbits other than watermelons, small, yellowish areas occur on the upper leaf surface. Later a more brilliant yellow color develops with the center of the lesion turning brown.
  • Usually spots are angular because they are restricted by leaf veins. When leaves are wet, a downy, white-gray-light blue fungus growth can be seen on the underside of individual lesions.
  • On watermelons, yellow leaf spots may be angular to non-angular and turn brown to black.
  • Spores produced on the lower leaf surface are readily spread by the wind. Rainy, humid weather favors the development of downy mildew.

Management

  • Spraying with Metalaxyl 500 g or Metalaxyl + Mancozeb 1 kg/ha or Mancozeb 1 kg/ha.

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