Areaa of Moderate to Severe Defoliation and Beetle-Killed Trees by Major Insects, 2008
(Hectares)
Insects
Canada
Spruce budworm
 1 056 384
e
Jack pine budworm
   168 834
e
Mountain pine beetle
 7 841 993
e
Hemlock looper
     9 537
e
Forest tent caterpillar
 1 602 234
e
Gypsy moth
    39 479
e
Blackheaded budworm
        ..
 
Balsam fir sawfly
    39 400
e
Swaine jack pine sawfly
        ..
 
Bruce spanworm
   759 512
e
Western spruce budworm
   804 711
e
Large aspen tortrix
   634 992
e
Two-year-cycle spruce budworm
    56 619
e
Spruce beetle
    51 593
e
Aspen twoleaf tier
        ..
 
Other
   668 440
e
Total
13 733 728
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:  2010-06-14