This summer, some prairie cities experienced a surge in mosquito populations, leading to a shortage of bug spray in stores in Manitoba, Saskatchewan, and Alberta due to high demand. Data from the City of Edmonton revealed a significant increase in mosquito numbers in July compared to the previous year, although not record-breaking figures. Similar trends were observed in Saskatoon and Winnipeg.
Experts attribute the mosquito boom to the record rainfall seen in southern Ontario, creating ideal breeding conditions for floodwater mosquitoes like the Ochlerotatus trivittatus species. Fiona Hunter from Brock University highlighted how the abundance of standing water from heavy rains facilitated the proliferation of these mosquitoes in the region.
The persistent biting behavior of Ochlerotatus trivittatus has resulted in more frequent human-mosquito interactions, contributing to the perception of a severe mosquito season. Additionally, the heavy downpours in areas like the Greater Toronto Area triggered the hatching of dormant mosquito eggs, further exacerbating the situation.
As temperatures drop, mosquito populations are expected to decline significantly. Colder temperatures are detrimental to mosquitoes, causing them to dry out and perish. Recent cold snaps in Alberta have already led to a decrease in mosquito numbers. While warmer weather may prompt a resurgence in mosquito activity, it is unlikely to reach the levels seen in central Canada.
Overall, the mosquito situation is expected to improve as temperatures continue to cool, bringing relief to residents from the prolonged mosquito season.