Horticultural crops :: Vegetables:: Musk melon and Water melon
| Downy mildew: Pseudoperonospora cubensis
Symptoms
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Itoccurs on cucumbers, squash, muskmelons, and pumpkins and less frequently on watermelons.
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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.
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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.
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On watermelons, yellow leaf spots may be angular to non-angular and turn brown to black.
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Spores produced on the lower leaf surface are readily spread by the wind. Rainy, humid weather favors the development of downy mildew.
Management
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