Tree Pests 

The main tree pests that exist in Alberta include:

The Large Aspen Tortrix  (Choristoneura conflictana) is a serious aspen defoliator in Canada and outbreaks may last 3-4 years. More Information

The Spruce Budworm (Choristoneura fumiferana) is one of the most sever forest defoliators in north America. More Information

The Mountain Pine Beetle (Dendroctonus ponderosae) is the most destructive pest of mature lodgepole pine forests in North America. More Information

The Forest Tent Caterpillar (Malacosoma disstria) is the most serious aspen defoliator in Canada. Forest tent caterpillar outbreaks may last 4 to 6 years and may repeat about every 10 years. More Information

The Spruce Beetle (Dendroctonus rufipennis) occur in endemic populations in white spruce stands throughout Alberta. Outbreaks of the spruce beetle often originate from areas with blowdown, logging slash, or damaged standing timber. Spruce beetles breed in these areas and may attack and kill healthy trees. More Information