My Almost Ripe Grapes Are Drying Up On The Ends Of The Bunch. Why?

Question

The bunches of almost ripe grapes are drying up on the ends while leaving half of the bunch getting ripe

Answer 1

It could be sunburn. Here are other possibilities:

https://www.gardeningknowhow.com/edible/fruits/grapes/summer-bunch-rot.htm

https://ipm.ucanr.edu/agriculture/grape/pierces-disease/