West Nile virus Vector Mosquito Management

Culex Environmental has extensive experience managing mosquitoes in all types of urban and industrial locations. Management may require intensive targeted treatments to reduce the risk of West Nile virus vector mosquito species. Sites that usually pose the most significant potential risks are typically manmade and include:

  • Catch basins
  • Waste water treatment plants
  • Disturbed areas on construction sites
  • Drainage ditches
  • Ornamental ponds and golf courses
  • Discarded containers, such as old tires, tarps and empty drums

Catch Basins

Street drains (or catch basins) pose a significant risk in the spread of West Nile virus (WNv) as they create the perfect WNv vector mosquito habitat of warm, shallow, nutrient-enriched (from organic input) water that is free of predators. They can be infested from early June to September, in particular by Culex pipiens, a highly competent WNv vector.  Culex Environmental has discovered that by coordinating climatic fluctuations, such as rainfall and temperature, with targetted drain clearing, we can significantly reduce larval mosquito abundance without always having to resort to widespread cheminal treatments. We now implement comprehensive catch basin control programs that incorporate regular cleaning and treatment into usable schedules for our clients. We are continually conducting our own research into the efficacy of larvicides currently on the market, including new approaches to quickly control mosquito larvae in catch basins.  

Waste Water Treatment Plants

Culex Environmental has found that waste water treatment plants (WWTPs) pose a special WNv problem, particularly if they contain open-air settling lagoons. These lagoons hold water that is highly nutrient-enriched, with few predators, little surface water flow, and low dissolved oxygen.  This environment provides the perfect egg-laying habitat for Culex pipiens and Culex tarsalis, both high risk West Nile virus vectors, where larvae can explode in numbers in a very short time. Because WWTPs are often near urban centres with large populations, they can pose a significant West Nile virus public health risk.

We have first-hand experience in monitoring and treating primary and secondary treatment facilities and provide a fast well-coordinated clinical service to counter larval infestations of WNv vector mosquitoes at WWTPs.