The city will continue to fog for mosquitos with only malathion because it doesn't have enough of a specific biological product for a pilot project.
Taz Stuart, the city's entomologist, said there has been a shortage of pyrocide but he may have enough to use if fogging is needed again later this summer.
"It's more costly but the benefit is you are putting less out into the environment," Stuart said.
Critics have said pyrocide could be carcinogenic.
Stuart said fogging will continue tonight in eight areas in the city's west and north -- including Garden City, Kildonan Park, Crestview, and Kirkfield. The insect areas are 26, 34, 35, 45, 47, 49, 50 and 51. For a detailed map see the city's website.
Stuart said average counts across the city are 37, up from 22 on Sunday, but he said the numbers are being skewed by a trap in Assiniboine Park with more than 200.
More than 650 people have signed up for a fogging buffer zone around their property with more than 200 added on Sunday. You can sign up for a buffer zone in person at 1539 Waverley St., by emailing 311@Winnipeg.ca, or by registering online.