Butternut Squash going bad

I am asking this for a friend.

His Butternut Squash, which started off well, now keeps producing fruit that molds and falls off.

It has plenty of water and is growing in a compost bin. It is not actually laying on the soil, so it can't be that either.

Does anyone know what the cause is and how to stop it, please? Thanks in advance.

 

Could it be slug damage?
I'm having a go at growing a winter squash for the first time this year and was really proud of the first fruit which got to the size of a walnut. However... the slugs came and nibbled the skin and now it looks like it's going to rot. Boo hoo!
Otherwise it could just be the damp weather - my courgettes did the same last year.

 

Hi Kedi,we grew Butternut Squashes for the first time last year and ours did exactly the same thing.We only picked four decent ones in the end and of those three rotted as we were trying to dry them off.They didn't even get to the size of the shop bought ones:(

The only thing I could put it down to was the wet season that we had last year.We are trying them again this year,but if we have the same rain like last year I fear we won't get any once again.We have no flowers or fruit yet so can't tell at the moment but i have said to Mr K that if they fail this year then we shall give up with them as they take so much of the ground up and it isn't worth growing them just for the leaves.

I am coming to the conclusion that to succeed with them you need to have a good hot season

 

Hi Kedi-Gato. That looks like fruit that hasn't been fertilised.
Has the weather been wet and the bees haven't been in.
Squash are like courgettes with the big yellow trumpet flowers. Rain can collect in the flowers and prevent pollination. A spell of wet weather and quite a few flowers can be spoiled.
A spell of good weather and visits from the bees will solve everything.

 

Pollinate them by hand? - belt & braces