Areaa of Moderate to Severe Defoliation and Beetle-Killed Trees by Major Insects, 2013
(Hectares)
Insects
Canada
Spruce budworm
 2 777 998
e
Jack pine budworm
    92 176
e
Mountain pine beetle
 2 973 935
e
Hemlock looper
    19 045
e
Forest tent caterpillar
 7 464 898
e
Gypsy moth
     8 452
e
Blackheaded budworm
    30 700
e
Balsam fir sawfly
     1 492
e
Swaine jack pine sawfly
        ..
 
Bruce spanworm
     5 066
e
Western spruce budworm
   128 037
e
Large aspen tortrix
     9 104
e
Two-year-cycle spruce budworm
    88 760
e
Spruce beetle
    26 601
e
Aspen twoleaf tier
 2 140 673
e
Other
 4 362 397
e
Total
20 129 334
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:  2015-01-15