Culex quinquefasciatus Credit: Jim Gathany Source: CDC

Species of Culex can be found throughout the globe, except at the extreme northern latitudes. Depending on the region and species, Culex mosquitoes can carry a wide array of public health threats.

Region Key Diseases Key Culex Species
Asia Pacific Japanese encephalitis virus
Filarial worms
Murray Valley encephalitis
Ross River viruses
Culex quinquefasciatus
Culex annulirostris
Culex fuscocephala
Culex tritaeniorhynchus
Culex gelidus
Culex vishnui
North America West Nile virus
St. Louis encephalitis virus
Western equine encephalitis
Dog heartworm
Culex pipiens
Culex quinquefasciatus
Culex tarsalis
Culex restuans
Culex nigripalpus
Culex salinarius
Africa West Nile virus
Filarial worms
Culex univittatus
Culex neavei
Culex perexiguus
Culex pipiens
Culex antennatus
Central and South America Venezuelan equine encephalitis virus
Filarial worms
Culex quinquefasciatus
Culex (Melanoconionvomerifer
Culex (Melanoconionpedroi
Culex (Melanoconionadamesi
Europe, Middle East West Nile virus
Filarial worms
Culex pipiens
Culex modestus
Culex quinquefasciatus

Culex mosquitoes breed in various types of stagnant water. Preferred oviposition habitats such as rainwater barrels, catch basins, storm drains, and septic tanks are rich in organic material. Eggs are laid in raft-shaped batches on the water surface.

While Culex will lay their eggs in a variety of standing waters, these habitats can typically be categorized into four ecotypes:

culex habitat4

Sewage Systems

  • General description: These highly polluted habitats contain sewage or mixed sewage and rainwater. These habitats include cess pits, septic ditches, septic tanks, and blocked sewerage systems.
  • Key sewage system Culex include:

culex habitat3

Container Sources

  • General description: These habitats are generally man-made sources that will catch and hold water, such as waste tires, buckets, and rain barrels.
  • Key container Culex include:

culex habitat2

 Drainage Systems

culex habitat1

Open Habitats

Links to suggested control solutions

VBC Biorational
Open Habitats
VectoLex WDG
VectoBac WG/WDG
VectoBac 12AS
Open habitats with minimal vegetation
VectoLex Granules Open and vegetated habitats
VectoMax Granules  Multi-habitat, multi-species solution for standing water
Drainage Systems
VectoLex WSP Catch basins, channels, roadside ditches, and underground storm water/drainage systems
VectoLex WDG
VectoMax WSP
VectoMax Granules
VectoBac WG/WDG
VectoBac 12AS
Contained Sources
VectoLex WDG Waste tires, buckets, and rain barrels
VectoLex Granules
VectoMax Granules Multi-habitat, multi-species solution for standing water