2021 Schedule of Adult Mosquito Control throughout Southern Manitoba under Ministerial Order

As of August 11, 2021

Mosquito spraying will take place in the evening and at night, weather conditions permitting. Information on adult mosquito control schedules for West Nile virus and a description of the areas to be sprayed are available below. Adult mosquito control cannot occur when weather conditions are unfavourable, i.e. when temperature is below 13 degrees Celsius, when wind speeds are not conducive, and if there is significant precipitation. If weather conditions are not conducive to adult mosquito control on the identified night, alternate arrangements will be made to undertake adult mosquito control usually the next consecutive night, as weather permits.

Communities in southern Manitoba may be issued a Ministerial Order to undertake adult mosquito control to prevent or alleviate the threat of West Nile virus to human health. The Order may require that adult mosquito control be undertaken within a specific community and may include approximately a three kilometre extended treatment area around the community.

Approved by Health Canada for use in 2017, DeltaGard 20EW® is classified as a reduced-risk pesticide. When applied using ultra-low volume methods and as per label directions DeltaGard 20EW does not present an unacceptable risk to human or environmental health. More information is available here.

Community under Order 3 km Extended Treatment Area (ETA)* Upcoming Treatment
Dates & Times**
Dates & Times

City of Portage la Prairie

RM of Portage la Prairie (click here for map)


August 14 & 17

Town of Ste Anne

RM of Ste Anne (click here for map)


August 14 & 17

RM of West St Paul



August 5 & 14

City of Winnipeg

Insect Management Areas (43, 44, 48, 49 and 51)


August 5 & 14

* Areas identified may fall partially or completely within an approximate 3 km extended treatment area of a community. Contact your municipal office if you are uncertain as to whether your residence falls within the extended 3 kilometer treatment area. 

** Upcoming dates are subject to change based on weather conditions.

For WNV health concerns, contact your doctor or call:

Health Links - Info Santé
(Winnipeg) or toll-free 1-888-315-9257