West Nile Virus
Prevalence: Moderate
Risk 4/5
Dark Ricefield Mosquito
Psorophora columbiae · “The Aggressive Pest”
Large, dark mosquito found in southern US. Breeds in temporary water. Known for aggressive swarming behavior.
Disease risks
How to identify
- Size
- 7-10mm (large)
- Color
- Dark brown to black
- Distinctive features
- Large size; dark coloration; prominent palps
- Resting posture
- Head-down posture
- Prefers
- Humans and large animals
- Pain level
- Very high
- Persistence
- Extremely persistent; forms swarms
- Transmission
- Competent vector for West Nile Virus
What actually works
ULV Mosquito Fogging
Ultra-Low Volume fogging using specialized equipment to create fine mist of insecticide. Covers large areas quickly; used for emergency mosquito swarms.
Pyrethroid Spray Treatment
Professional-grade synthetic pyrethroid insecticide applied by licensed technicians. Fast-acting, EPA-approved, effective against adult mosquitoes.
Habitat Elimination (Source Control)
Removal and treatment of breeding sites. Professional inspection identifies and eliminates standing water where mosquitoes lay eggs.
Cities where Dark Ricefield Mosquito is active
Fun fact
Psorophora columbiae emerges in astronomical numbers during rice-growing season in Texas, sometimes making outdoor activity nearly impossible.