Watermelon leaves turning brown

Watermelon    Nigeria

Please help me..my watermelon leafs are turning brown, like they are dying.! What's wrong with the plant? What do i need to do to stop it?

Posted by: Dauda Wudiri (1 point) Dauda Wudiri
Posted: July 30, 2016


I think it may be downy mildew disease caused by fungus Pseudoperonospora cubensis. To confirm further we need to see underside of infected leaves. If it is downy mildew you will notice brown to grey fungal growth on the lower surface of the spots. The best time to observe this is early morning hours ie., when the leaves are covered with dews.
The main symptoms of downy mildew are appearance of yellow to brownish irregular spots on upper surface of leaves initially. As the disease advances the brown spots appears on both surface of leaves. Later this spots will enlarge quickly and turn black resulting in withering and dying of entire leaf. Typically the petiole of infected leaves stand straight even though the whole leaf is dead (see your first image). The disease is favored by high humidity and cool temperature.

Posted by: Dr. Ravishankar Narayana (13 points) Dr. Ravishankar Narayana
Posted: July 31, 2016

Dauda Wudiri commented,
almost 5 years ago.

jamjam commented,
Hello, how can i overcome or rectify this problem on the plants?

almost 4 years ago.

Dr. Ravishankar Narayana this is the picture of the underside of the affected leaves...thanks.

Posted by: Dauda Wudiri (1 point) Dauda Wudiri
Posted: August 2, 2016

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