Culex (Melanoconion) panocossa from peninsular Florida, USA

Area of Science:

• Medical Entomology
• Infectious Disease Ecology
• Vector-Borne Diseases

Background:

• Culex (Melanoconion) panocossa is a known suspected vector of Venezuelan equine encephalitis virus.
• This mosquito species was previously documented in Central America, northern South America, and the Greater Antilles.
• Its known geographic distribution did not include the continental United States prior to this study.

Purpose of the Study:

• To report the first confirmed establishment of Culex (Melanoconion) panocossa populations in the continental United States.
• To assess the potential public health implications of this mosquito's introduction into Florida.

Main Methods:

• Larval and adult mosquito specimens of Culex (Melanoconion) panocossa were collected.
• Sampling occurred at two distinct locations near Homestead, Florida.
• Ecological associations, specifically with Pistia spp. (water lettuce), were noted.

Main Results:

• Substantial established populations of Culex (Melanoconion) panocossa were identified in Homestead, Florida.
• Larvae were found to be associated with water lettuce (Pistia spp.).
• The presence of established populations indicates successful introduction and adaptation to the Florida environment.

Conclusions:

• The establishment of Culex (Melanoconion) panocossa in Florida represents a significant public health concern.
• The mosquito's association with invasive water lettuce indicates a high likelihood of range expansion within Florida's freshwater ecosystems.
• Proliferation in populated areas could facilitate the transmission of viruses like Everglades virus to human populations.