How to Identify
– Small, long-legged flies active at dawn and dusk that leave itchy welts after biting.
– Larvae (wigglers) in stagnant water such as birdbaths, clogged gutters, and plant saucers.
– Adults resting in dense shrubs, tall grass, or shaded porches during the heat of day.
– Increased activity around outdoor events in the River Arts District and riverside properties at dusk.
Habitat
Females breed in any standing water — gutters, birdbaths, tree holes, low-lying puddles, and containers holding as little as a bottle cap of water; adults rest in dense vegetation and shaded areas.
Health Risks
Primary disease vectors; capable of transmitting West Nile virus, eastern equine encephalitis, dengue, Zika, and malaria depending on species and region; bites cause allergic reactions in sensitive individuals.
Bites cause local allergic reactions and can transmit diseases like West Nile virus; Asheville’s warm, wet summers increase local exposure risk for residents and visitors.
Treatment
Source reduction (eliminate standing water), larvicide treatment of remaining water sources, adulticide perimeter spray or misting-system treatment to knockdown resting adults; professional barrier programs.
Bench 359 emphasizes source reduction plus targeted larvicide for persistent breeding sites and a professional perimeter barrier or scheduled barrier sprays for yards used for nightly outdoor living or events.
Prevention Tips
– Empty and refresh birdbaths, pet bowls, and flower pot saucers at least weekly.
– Clean and flush gutters regularly to prevent water accumulation.
– Install or repair window and door screens to keep adults out.
– Apply EPA-registered insect repellent (DEET, picaridin, or IR3535) when outdoors.
– Mow tall grass and trim dense shrubbery where adults rest during the day.
– Empty and refresh birdbaths, gutters, and pot saucers at least weekly to prevent breeding after frequent Asheville rainfalls.
– Maintain trimmed lawns and remove dense leaf litter along creek edges to reduce adult resting habitat.
– Cover or store boats, tarps, and outdoor containers that collect water during spring and summer storms.
– Use screens and consider scheduled barrier treatments for yards that host outdoor gatherings along the river or park areas.
– Encourage event organizers (River Arts District, small weddings) to schedule professional pre-event spraying when needed.