No new exotic mosquito species introduced to New Zealand in 2020.
- The Culex sitiens, first discovered in Kaipara Harbour in 2018, was eradicated in 2020
- As of 2020, there are three long-established exotic mosquito species in New Zealand
- The Southern Saltmarsh mosquito (Aedes camptorhynchus), first discovered in New Zealand in 1998, was eradicated in 2010
No new exotic mosquito species were introduced in 2020. There are currently three long-established exotic species present in New Zealand. The eradication of the Southern saltmarsh mosquito (Aedes camptorhynchus) in 2010 has been the most important change to New Zealand’s mosquito profile in recent years (Table 1).
Table 1: New Zealand’s recent history of exotic mosquito introductions
|Exotic mosquito species known to have established in New Zealand
||New Zealand distribution
1961 - present
Southern South Island
||1916 - present
North Island and South Island from Lyttelton north
||1830 - present
||North Island and northern South Island
Southern Saltmarsh Mosquito
|1998 - 2010
||North and eastern North Island and northern South Island
Data source: New Zealand BioSecure, 2021 
In 2018, the Ministry for Primary Industries (MPI) first reported finding Saltmarsh Culex (Culex sitiens) larvae in the Kawau Parua Inlet, Kaipara Harbour (Auckland Region) through the National Saltmarsh Mosquito Surveillance Programme. In 2020, MPI announced the eradication of the Culex sitiens from New Zealand, two years after larvae were initially detected. The eradication was the result of a successful ground surveillance and aerial spraying programme. Culex sitiens is a vector of Ross River virus and possibly Japanese encephalitis .
1. New Zealand BioSecure Entomology Laboratory. New Zealand Mosquitoes. Southern Monitoring Services Limited. (Accessed February 2021). Available at: www.smsl.co.nz
2. MPI (Ministry for Primary Industries). Alerts: Culex stitiens. (Accessed February 2021). Available at: www.mpi.govt.nz