Rain, heat create 'perfect storm' for exploding mosquito numbers: Regina official

The City of Regina's traps caught 780 mosquitos in 11 weeks — and then almost 2,000 over the past two days

Rain, heat create 'perfect storm' for exploding mosquito numbers: Regina official City expects populations to spike for a week or two, then drop Have mosquitoes been biting you more than usual lately? Officials with the City of Regina say a sustained period of rain and heat has created a "perfect storm" for rapid population growth of summer's most notorious blood-sucking pest. Ashley Thompson, the city's manager of parks and technical services, said the city's trapping program caught 780 mosquitoes over the course of 11 weeks — and then caught nearly 2,000 in the last two days.

"The weather has created the perfect storm," Thompson said at a news conference on Tuesday. "A lot more rain than we're used to in June, and then the heat came and it just accelerated the larval development." The city's mosquito control program involves treating standing water with larvicide that specifically targets and kills the juvenile insects.

But for the adult population, there is very little the city can do, Thompson said. Killing masses of adult mosquitos involves toxic chemicals deployed by special and expensive machines. "We are seeing standing water drying up, which is good news," Thompson said.

"So we will see a spike for a week or two but then it'll go back down again." In the meantime, Thompson said the city is urging people to use mosquito repellent and wear light-coloured clothing. Sean Prager, an associate professor of plant sciences at the University of Saskatchewan, told CBC News last month that products containing DEET remain the gold standard.

However, oil of lemon eucalyptus and a compound called IR3535 are also effective, he said. Permethrin-treated clothing and gear works, too, but nearly everything else is “nonsense,” Prager said.