Landcare Research - Manaaki Whenua

Landcare-Research -Manaaki Whenua

Long-lived adult of Poor Knights weevil

The adult of the Poor Knights weevil, Hadramphus pittospori, has been recorded as living for 3 years: most adults of weevil species of the world do not live more than 1 year.
  • The adult is 16-20 mm long.
  • The 6 larval stages last about 1 year, and grow inside their host plant karo (Pittosporum crassifolium).
  • The pupal stage lasts about 3 weeks, then the adult hatches.
  • The long adult life of these weevils is unusual. It is perhaps one explanation why populations of large-sized weevils related to this species are so badly affected by introduced predators such as rodents.