This summer, prairie cities in Canada experienced a surge in mosquito populations, leading to shortages of bug spray in stores in Manitoba, Saskatchewan, and Alberta. Data from the City of Edmonton revealed a significant increase in the number of mosquitoes compared to the previous year, although not record-breaking figures. Saskatoon and Winnipeg also reported higher mosquito numbers in July.
Experts attribute the mosquito boom to the record rainfall seen in southern Ontario, creating favorable conditions for the Ochlerotatus trivittatus species. Fiona Hunter from Brock University explained that the species thrives in areas with standing water, which the excessive rain provided this year.
The persistent biting behavior of Ochlerotatus trivittatus has resulted in more frequent human encounters this season, contributing to the perception of a particularly bad mosquito year. Additionally, the heavy rainfall triggered the hatching of dormant mosquito eggs, intensifying the mosquito activity in regions like Toronto.
As temperatures drop, mosquito populations are expected to decrease significantly. Colder weather is detrimental to mosquitoes, causing them to dry out and die. Reports from Alberta indicate a decline in mosquito numbers after a cold snap. Despite a warm fall in Edmonton, a drop in mosquito numbers is anticipated, although a resurgence is possible with a forecasted rise in temperatures.