White mould - rotting oranges on tree

[fyfin]

We have a relatively young orange tree and this year we had lots of oranges for the first time. However, when I was showing my sister who was visiting she spotted some of them were soft and covered in what looked like a white/blue mould. When I looked closely I could see there were quite a few like this so I took them off. Most of them didn't seem ripe but I took them all off anyway and juiced them, it tasted Ok actually but I wondered if I should have sprayed the tree with something.

[spanish_lad]

We bought a sack from carrefour last week, unfortunately we had to throw at least 10 oranges away because they were soft and mouldy.

[fyfin]

This has happened to us before when we bought some from the market and left them in a fruit bowl. My wife thought it was something they had been sprayed with but we had washed them. Still a bit of a mystery