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Culex Mosquitos

Identification, Habits, and Control
Closeup photo of a Culex Mosquito

About Culex Mosquitos

Genus: Culex spp.
Culex mosquitos are one of the most common mosquito species found in the South. They are primarily active during the evening and nighttime hours and are commonly associated with standing water in both residential and commercial environments.

How to Identify Culex Mosquitos

Size

  • Small—about 1/8 inch long

Color

  • Light brown to tan

Identifying Characteristics

  • Slender body with narrow wings
  • Typically active at night
  • Often found near standing water

Where You’ll Find Them

  • Standing water such as ponds, ditches, and gutters
  • Birdbaths, containers, and clogged drains
  • Areas with poor drainage
  • Outdoor environments near structures

Behavior and Risks

Culex mosquitos breed in standing water and can develop in both natural and man-made water sources. Females lay eggs in clusters on the surface of water, forming floating rafts that allow larvae to develop below the surface. Homeowners may notice increased mosquito activity during the evening hours, particularly in shaded areas or near water sources. Bites often occur at night, making outdoor activities uncomfortable during peak times. 

Because they can breed in a wide range of water sources—including gutters, containers, and low-lying areas—populations can develop quickly if standing water is not addressed. Even small or overlooked water sources can support ongoing activity. 

Repeated nighttime biting, visible activity near lights, and increased presence around water features are common signs of a Culex mosquito issue. Reducing standing water and targeting breeding areas are key to controlling this species and preventing ongoing activity.