Areaa of Moderate to Severe Defoliation and Beetle-Killed Trees by Major Insects, 2011
(Hectares)
Insects
Canada
Spruce budworm
 1 677 167
e
Jack pine budworm
    44 968
e
Mountain pine beetle
 4 624 907
e
Hemlock looper
    20 157
e
Forest tent caterpillar
   600 448
e
Gypsy moth
        ..
 
Blackheaded budworm
    41 112
e
Balsam fir sawfly
    58 637
e
Swaine jack pine sawfly
       787
e
Bruce spanworm
    44 601
e
Western spruce budworm
   623 426
e
Large aspen tortrix
    95 381
e
Two-year-cycle spruce budworm
   178 206
e
Spruce beetle
    61 774
e
Aspen twoleaf tier
        92
e
Other
 1 112 578
e
Total
 9 193 488
e
*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:  2013-01-28