Areaa of Moderate to Severe Defoliation and Beetle-Killed Trees by Major Insects, 2012
(Hectares)
Insects
Canada
Spruce budworm
 1 788 043
r
Jack pine budworm
    61 018
e
Mountain pine beetle
 3 016 228
e
Hemlock looper
    13 876
r
Forest tent caterpillar
   729 874
r
Gypsy moth
     8 123
e
Blackheaded budworm
    36 249
r
Balsam fir sawfly
    46 236
e
Swaine jack pine sawfly
        ..
 
Bruce spanworm
        ..
 
Western spruce budworm
   456 745
r
Large aspen tortrix
     8 123
r
Two-year-cycle spruce budworm
    74 891
r
Spruce beetle
    43 145
e
Aspen twoleaf tier
   174 655
e
Other
 2 125 459
r
Total
 8 582 665
r
*a
Any forested area may be defoliated by more than one insect. Therefore, there can be considerable overlap in the reported figures. The area within which there is moderate to severe defoliation can also include roads, cultivated areas, small lakes or burned areas.
Source: National Forestry Database.
Updated:  2014-05-30