For the last 10 or 20 years, British Columbia farmers have been complaining about an invasive weed - one that travelled to North America with European settlers. It makes light-skinned livestock such as sheep sensitive to sunlight, causing blisters, sore mouths, hair and weight loss.
Pesticides kill the weed but also destroy trees and other vegetation.
And the weed is usually the first plant to come back after spraying. So, Canada makes its first foray into biological weed control and imports insects that are successfully controlling the noxious plant in California. There's no advocates for the plants themselves. We don't want to demonize these plants and exterminate them. It is becoming a valuable commercial crop.