Faced with a spike in the number of mosquitoes in all areas of Winnipeg, the city's Insect Control Branch says it will begin a fogging operation on Thursday night.

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Faced with a spike in the number of mosquitoes in all areas of Winnipeg, the city's Insect Control Branch says it will begin a fogging operation on Thursday night.

In a statement, the city said Wednesday it has been using larviciding and residual treatments to control mosquito populations. However, on Wednesday trap counts were at a city-wide average of 140, and the city-wide Adulticiding Factor Analysis (AFA) rating moved from medium to high. As a result, the city will start fogging Thursday between 9:30 p.m. and 6:30 a.m.

City spokeswoman Lisa Fraser said the first fogging crews will hit streets in the northwest region of the city on Thursday night, but the specific insect control management areas won't be announced until earlier on Thursday.

"The wet weather we received over the last few weeks has caused a significant emergence of adult nuisance mosquitoes," Fraser said.

City officials say all three conditions needed to start fogging under the city's adult nuisance mosquito control policy and the provincial pesticide use permit, have been met: the AFA has to be high, a minimum of 25 female mosquitoes have to be caught in traps for two nights in a row, and one or more quadrants of the city have to have 100 female adult mosquitoes caught in traps.

The city will use pro Malathion ULV and all buffer zones will be respected.

Officials say the city will let Winnipeggers know at least eight hours in advance where fogging will be conducted. Information is available on the city's website at winnipeg.ca/bugline, and residents can request individual telephone or email notification by calling 311 or emailing 311@winnipeg.ca.

Individual who are opposed to the use of insecticides adjacent to their principal residence for the control of adult mosquitoes can register for a buffer zone by faxing 311, emailing 311@winnipeg.ca, or writing to the Insect Control Branch, 3 Grey Street, Winnipeg, Manitoba, R2L 1V2. Individuals who want a buffer zone must include their name, the date, and the address of their principal residence, and proof of occupancy (such as a driver's license, utility bill, etc.); and specify which programs they are refusing.

People who want to register for a buffer zone can also do so in person; the Insect Control Branch will offer extended hours at 1539 Waverley St., on Wednesday and Thursday from 8:30 a.m. to 8 p.m., for registration. In-person registrations will be processed within 24 hours; other methods could take as long as 14 days.

More information about insect control is at www.winnipeg.ca/bugline.