FORTECK FORESTRY FACTS🌲🌲 •
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Forest insects and diseases in Canada are typically classified into three broad categories: native, alien, & invasive
“Forest insects and diseases in Canada are typically classified into three broad categories:
Native: Indigenous species that have existed in Canada for thousands of years. Outbreaks occur periodically. Examples are spruce budworms and mountain pine beetle.
Alien: Species introduced into Canada’s forests within recent history. They are also referred to as “exotic,” “non-native” and “foreign.” Examples include emerald ash borer, brown spruce longhorn beetle and Dutch elm disease.
Invasive: Insects and diseases that spread beyond their known usual range.
Both terms, “alien” and “invasive,” refer to shifts from one ecosystem to another, not to shifts across national borders. So, even organisms that move into new ecosystems within the same country can be considered alien and invasive if they extend beyond their usual geographic range. The spread of mountain pine beetle from British Columbia’s lodgepole pine forests to Alberta’s jack pine forests is an example of a native forest insect behaving invasively.”
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