I have a watermelon crop that is of 8 days now and there is a leaf boring insect on my crop so I need help for it. The leaves are getting white lines in them due to some kind of insect.
If this is a squash borer infestation it will likely spread quickly and kill the Watermelon very quickly.
Removing the diseased plants to help the problem from spreading is the best coarse of action.
If the damage is from another type of insect, Neem Oil may work as a treatment. It is safe for people, pets and bees.
Here are links with more information.