As temperatures rise across Nova Scotia, residents are noticing a significant increase in blackflies compared to previous years. However, there may be a positive aspect to this surge in blackfly activity.
According to Andrew Hebda, a retired zoology curator at the Nova Scotia Museum, blackflies are typically inactive during winter and cold spells, only becoming active in spring when the weather warms up. This season, they are emerging rapidly.
Hebda explained that with about 10 to 14 consecutive warm days, the majority of blackflies will have emerged, reproduced, and then disappeared for the summer as they have only one breeding cycle per year. In contrast to mosquitoes, which can produce up to six generations annually, blackflies do not reappear until the following year after reproducing.
Hebda noted that mosquitoes thrive in warm, moist summers. Last year’s dry conditions led to some suppression of blackflies despite higher temperatures.
To avoid blackflies, it is recommended to steer clear of tall grass and wooded areas. For mosquitoes, staying in open spaces with strong, steady winds is advised. Using bug sprays to mask your scent or wearing bug jackets to create a physical barrier can also help protect against insect bites.