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Targeted West Nile Virus Larviciding Program begins Monday, June 18

Posted: June 18, 2018


Targeted West Nile Virus Larviciding Program begins Monday, June 18


The RM of West St. Paul, in partnership with the City of Winnipeg, will begin a West Nile Virus targeted Larviciding Program in the municipality on Monday, June 18.

Larviciding is the most effective and environmentally acceptable method of mosquito population reduction. Mosquito larvae are concentrated in water sites which make them the most vulnerable stage of the mosquito lifecycle.  By targeting larvae in ditches, pools and containers, countless numbers of mosquitoes are killed before they reach the flying adult, biting stage.

Mosquito larvae occur in many types of aquatic habitats.  The most common nuisance species lay their eggs in temporary or ephemeral rainwater pools of 1 to 2 weeks duration.  Vector, or disease carrying, species generally lay eggs in all types of containers, semi-permanent and permanent aquatic habitats.

The Larviciding Program uses a combination of biologicals and biorational larvicides that are applied according to Health Canada's Pest Management Regulatory Agency (PMRA)regulations.  

The following biological larvicides are used: Bacillus thuringiensis var. israelensis, known as Bti under the trade names Vectobac® 200G and Vectobac® 1200L

Biologicals are utilized for all larviciding in environmentally sensitive areas such as residential areas, playgrounds, parks, bee hives, etc., and in temporary water bodies that are not connected with natural water bodies.

The following biorational larvicides are used: Methoprene under the trade name Altosid® - Granular (methroprene) and Altosid® - Liquid (methroprene).  All applications meet or exceed provincial permit requirements.