Province to fog for mosquitoes in Boissevain
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The province has announced another round of mosquito fogging due to West Nile virus concerns — and one western Manitoba municipality will be included this time.
Boissevain and two other communities will be sprayed with the insecticide DeltaGard 20EW after surveillance data from last week show high counts of adult culex tarsalis mosquitoes and evidence of infection with West Nile virus, the province said in a bulletin Thursday.
The bulletin said the Municipality of Boissevain-Morton will be fogged within an approximate 3.5-kilometre radius of the intersection of Highway 10 and North Railway Street in the community of Boissevain. Morden and part of the Rural Municipality of Stanley will also be sprayed.
Confirmed dates will be communicated through the affected municipalities and posted on the 2026 schedule of adult mosquito control across southern Manitoba at gov.mb.ca, the bulletin said.
The province recently carried out a previous round of fogging in Winnipeg and a handful of rural areas, also due to West Nile virus concerns.
The ministerial order authorizing the treatment under the Environment Act comes during high season for infection.
“The province is currently in the highest-risk period for human exposure, which historically occurs between July 15 and Aug. 15 each year,” the bulletin said.
Weather conditions have accelerated the threat of the disease among mosquitoes, it added.
“High temperatures across southern Manitoba have shortened the time required for West Nile virus to develop within infected culex tarsalis mosquitoes and be transmitted to humans.”
DeltaGard 20EW was approved by Health Canada for use in 2017 and is classified as a reduced-risk pesticide.
“When applied using ultra-low volume methods and as per label directions, DeltaGard 20EW is unlikely to affect human health,” the province said.
A week ago, the province ordered spraying in Winnipeg neighbourhoods and several other communities, including Carman, Stonewall, Winkler, Chrotitz, Schanzenfeld, Reinfled, West St. Paul and zones inside of the rural municipalities of Dufferin, Rockwood and Stanley.
No human cases of West Nile virus have been confirmed in Manitoba this year, the province said.
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