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Rain Fuels Major Mosquito Outbreak This Summer
19 Sep
Summary
- Mosquito populations surged significantly in Edmonton this summer compared to last year.
- Heavy rainfall in southern Ontario created ideal breeding conditions for floodwater mosquitoes.
- Colder overnight temperatures are expected to significantly reduce mosquito populations soon.
This summer saw a significant increase in mosquito populations across several Canadian regions, notably in prairie cities and southern Ontario. Edmonton recorded a 15-fold rise in mosquitoes in July compared to the previous year, a stark contrast to recent seasons. Similarly, Saskatoon and Winnipeg experienced higher mosquito numbers. In southern Ontario, abundant rainfall created optimal conditions for the Ochlerotatus trivittatus, a floodwater mosquito species known for persistent biting. This species thrives in waterlogged areas, which were prevalent due to heavy summer rains.
The torrential downpours may have also triggered the hatching of dormant eggs, leading to a population boom. Experts noted that while concerning, this surge is temporary. Mosquitoes are sensitive to temperature extremes; they struggle in excessive heat and perish with cold. As overnight temperatures drop below 10 C, their numbers are expected to decline, with a hard frost signaling their end. Alberta, for example, saw its mosquito population crash after a recent cold snap, though warmer weather might bring a temporary resurgence.
