ID needed for this plum eater!

ID needed for this plum eater!

Observation - ID needed for this plum eater!. Description: These pink larvae ruined some of my mum's plums in the summer. Can anyone help with an ID, please? There was a sticky substance on the affected plums.

These pink larvae ruined some of my mum's plums in the summer. Can anyone help with an ID, please? There was a sticky substance on the affected plums.