To expand on this, many states have a large white pine lumber industry. The white pine is highly susceptible to a type of fungus harbored by currants.
The fungus does not spread from white pine to white pine, only from currants to currant, or currant to white pine, so eliminating the nearby currants protects the white pine industry.
The fungus does not spread from white pine to white pine, only from currants to currant, or currant to white pine, so eliminating the nearby currants protects the white pine industry.