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Mosquito counts rise, but risk goes down

A dead mosquito.

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A dead mosquito. (JOE BRYKSA/WINNIPEG FREE PRESS ARCHIVES)

Although there are a few more mosquitoes buzzing around this week compared to last, the overall risk is low, the city says, and there are no plans to fog this week.

An average of 125 mosquitoes were caught in city traps on Sunday, with 146 caught on Monday. That's up from 60 and 135 the week before.

But when things like weather and mosquito lifecycles are taken into account, the city's Adulticiding Factor Analysis numebr actually fell a notch, from 12 to 11, remainining in the medium range.

City guidelines call for fogging with malathopn to kill adult mosquitoes only when the AFA number reaches 15 or higher on the 18-point scale for two counts in a row, or if the average number of mosquitoes caught in city traps is 1,000 or higher. A single trap with more than 2,000 mosquitoes would also trigger fogging.

The city would also fog if ordered to by the provincial government, for example to combat West Nile virus.

City staff do say they are monitoring new puddles left in the wake of last week's storm, and they are applying larvicide where possible to kill the mosquitoes before they take to the air.

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