Mel wrote:

This year when my zucchini get about 6 inches long they turn black on both
ends and get soft. What could be causing this?

It occurs to me that they are rather tasty at that size. Pick them small
before they start to rot. You'll encourage the plants to produce much
more heavily, you won't lose out on your harvest and you'll probably get
the best zucchini you've every had!

Regards,
PZ.