What's happening to my watermelon plants?

Watermelon    None Given

Hello everyone!
I have about 20 yellow watermelon plants (janosik cultivar).
They are blooming and some watermelons are growing up.
I noticed that some plants have 1 or 2 leaves with yellowing and burned tip.
What could it be?
I cut the damaged leaves but I would like to know if it is a fungine attack or other.
Two days ago I gave about a spoon of NPK 5-10-15 fertilizer.

Posted by: Mirko (1 point) Mirko
Posted: July 12, 2016

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