Cherry fruits having worm insite.

thaabith

Hi,
Our Cherry tree starting blooming, now. Every year, we always having full of tree good looking fruits. But, we had found small worms in site the every fruits. We could not  find any holes on the fruits. Have we apply any medicine while flowering? We need Your advice, please!
Kind regards,
Thaabith.
  

Dovefromabove

A possibility is this type of fruit fly which has spread from the far east to Europe

https://www.rhs.org.uk/Advice/Profile?PID=852&awc=2273_1586099276_86a214805fc88628c7b536028dee9639

thaabith

Thanks A Lot.