West Nile Virus


open grate in roadMosquitoes complete all 4 stages of their development, from egg to larva, pupa and then adult, in water. Larviciding involves the use of approved chemical or biological pesticides to control mosquitoes at the larval stage, before they can mature into adult mosquitoes and disperse.

Research has shown that roadside catch basins are prime breeding sites for mosquitoes associated with WNV. Therefore, monitoring and larviciding of regional and municipal catch basins are necessary components of the Durham Region West Nile Virus Vector Control Plan (PDF).

Larviciding Techniques Applied in Durham Region

For more information, please refer to Facts About… Larviciding, Facts About… Stagnant Water & Mosquito Prevention, Fact Sheet on the Use of Methoprene in Mosquito Control Programs (PDF), Fact Sheet on the Bacillus thuringiensis israelensis (Bti) (PDF).