Bugs in plums

My plum tree is absolutely loaded with plums but EVERY one I pick has a bug in it!  Has anyone any explanation, or can you tell me how I can avoid the problem next year?  I am so disappointed as they look absolutely lovely!
Thank you
Gardening Granny

Wasps - really???  Do they look like little maggots? Each one is black all round the plum stone too, looks like tiny seeds.  Think whatever it is gets in through the stalk as most of them have a minute hole there.

I didn't know that about them ripening early with maggots in. My Victorias were infested with most having a little pink maggot inside...I had harvested them , removed maggots and made them into jam but was then told that they shouldn't be ripening yet....that makes sense....
The ones that were left unripe on the tree were the ones not infested then .....
Next year, I'm going to get a pheromone trap to hang underneath the tree

After 3 years of this pruned mine at ground level today !

My plum tree was full of blossom, but I only have 6 plums, the tree has been planted for about 4 years, do they have to mature more to get a decent crop? The leaves on it are also full of holes so I will be interested  to find out also

Has anyone tried the traps, if so do they work and when is the best time of year to use them?  I will be sorry to lose my crop again next year.
I have done what a previous poster said though, and cut mine up and used the 'good bits' to make chutney, which is lovely!
Gardening Granny