This is butternut squash. The squash itself looks good, the leaves are dying due to potassium deficiency. The stem end of the squash has formed very well. There was no potassium deficiency during it's formation. These leaves are closer to the roots and the potassium has been sucked out of the leaves and moved to the end of the vine. The last 7 feet is flourishing. I have plenty of squash, more than I can use. It will keep til March, sometimes April.