Mosquitoes appear to be almost non-existent in Winnipeg right now, and the city's insect control branch wants to keep it that way as much as possible.

Crews are aggressively larviciding for mosquitoes, and officials are reminding homeowners to dump out any standing water on their properties.

The mosquito trap count on Tuesday was just one, but officials warn that warmer temperatures and rain this week could cause an explosion in the mosquito population.

Heavy rain is in the forecast across southern Manitoba, including Winnipeg, later this week.

CBC meteorologist John Sauder is predicting upwards of 40 to 50 millimetres in general rainfall amounts from Wednesday night through Saturday.

There may be higher amounts in thunderstorms and in areas near the Manitoba Escarpment, he said.

Cankerworm tree-spraying to start

Meanwhile, insect control officials are predicting very few cankerworms in Winnipeg this year, although they expect to see higher concentrations in the North End, the Kildonans and River Heights.

The city is starting its cankerworm tree spraying program Wednesday at 9:30 p.m., weather permitting, in the following neighbourhoods: Inkster-Faraday, Luxton, St. John's and St. John's Park.