By Brendan Pietrobon, CBC News Ottawa, June 1, 2019
It's spring — the deck furniture is back out, people are in their gardens again and thinking about larger forays into nature. It's also a good time to learn about some of the unwelcome critters you may encounter out there.
When invasive species arrive in Canada, often transported accidentally by humans, they can multiply quickly without natural predators to keep them in check. They can also kill or displace native plants and animals in a region and reduce biodiversity.
The Canadian Food Inspection Agency (CFIA) is responsible for monitoring invasive species. It estimates these pests cost the Canadian economy around $30 billion per year.