Neonicotinoid are a class of pesticides harmful to human brains and sperm and deadly to bees, insects and birds. They are banned in Europe because of the ecological harm they cause. Canada initially planned to follow suit, but relented after years of pressure by industry.

Critics were unconvinced by Naqvi's response.

"For the past decade, Health Canada has repeated the line that they are examining the evidence of harm from neonics, all the while continuing to allow their widespread use," said Lisa Gue, manager of national policy for the David Suzuki Foundation.