Plums have maggots

Hey there! My plums are magnificent but many of them have one maggot living inside, leaving brown trails (excrement i hear). I read that they leave the fruit end of summer and enter the soil, where they hibernate and become moths that come back in spring and lay eggs on the fruit.
Has anyone had any success in keeping these maggots out of the fruits?
I'm in Northern Germany, near Berlin.

Thank you!
Best
Lewis

Yeah, had the same with my plums a few years back, same brown trails inside the fruit. Sticky traps hung in the tree when it was in flower caught some of the adults before they could lay. Never eliminated it completely but it was noticeably better. Also read that loosening the soil underneath in autumn exposes the pupae to birds and frost, did that too and I think it helped. Worth a go before reaching for anything stronger.

Plum Fruit Maggot, a moth:

https://en.wikipedia.org/wiki/Grapholita_funebrana

I have chickens and ducks who get free range access under my trees which has helped, though not eliminated it.  In my view, the maggots don't really render the fruit useless;  I cut them open and wash them out.  Obviously this won't work if I'm selling the plums (I'm not);  for personal use, I'm fine with it.

I've also noticed that my maggoty plums ripen first and the clear ones ripen a few weeks later.  This second ripening are the ones I usually give away.

G Freden wrote:I have chickens and ducks who get free range access under my trees which has helped, though not eliminated it.  In my view, the maggots don't really render the fruit useless;  I cut them open and wash them out.  Obviously this won't work if I'm selling the plums (I'm not);  for personal use, I'm fine with it.

I've also noticed that my maggoty plums ripen first and the clear ones ripen a few weeks later.  This second ripening are the ones I usually give away.

I do agree that the plums are still fine to eat after washing them out. I did indeed wonder how organic plum growers deal with this problem.
I will try loosening the soil and perhaps introducing some
parasitic wasps early in the year.