Beginner Gardening: Pumpkin Vine / Leaf issue, 1 by Teelow

Teelow wrote:
I am having issues with my pumpkins and am at a loss what the issue may be. Recently all the ends of my pumpkins vines are starting to yellow and die. All the newest leaves are stunted and a combination of yellow / green and crispy to the touch. I do have pumpkins growing on the vines in question and are doing quite well. Also, all the older leaves are huge and green and very healthy looking. Its only the newest of the leaves that are having the issue. I don't believe it is a pest / virus since the older leaves are just find and the fruit are growing nicely. Perhaps it is sun burn?

I have included a picture of a leaf for example. ANY help would be appreciated as this is quite frustrating.