Areaa of Moderate to Severe Defoliation and Beetle-Killed Trees by Major Insects, 2012
(Hectares)
Insects
Canada
Spruce budworm
 1 788 040
r
Jack pine budworm
    61 018
e
Mountain pine beetle
 3 016 228
e
Hemlock looper
     7 333
e
Forest tent caterpillar
   706 727
r
Gypsy moth
     8 123
e
Blackheaded budworm
    11 541
e
Balsam fir sawfly
    46 236
e
Swaine jack pine sawfly
        ..
 
Bruce spanworm
        ..
 
Western spruce budworm
   139 326
e
Large aspen tortrix
     8 123
r
Two-year-cycle spruce budworm
     3 192
e
Spruce beetle
    43 145
e
Aspen twoleaf tier
   174 655
e
Other
   528 619
e
Total
 6 542 306
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:  2014-02-18