Plum curculio larvae are typically 6 to 9 mm long when fully grown , when they reach the pupal stage measuring about 5 to 7 mm ; all adult characteristics are visible in this stage prior to transformation .
Plum curculio larvae are typically 6 to 9 mm long when fully grown . 
 After this , the beetle reaches the pupal stage measuring about 5 to 7 mm ; all adult characteristics are visible in this stage prior to transformation .