Natural Disturbances
  Insect Area
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Year  Area of Moderate to Severe Defoliation caused by Insects
ha
 
 
19756,000   
19760   
19770   
19783,000   
19792,875,000   
19801,750,000   
19813,000,000   
19824,291,000   
19831,320,000   
19842,000   
1985156,000   
1986316,000   
19871,328,000   
19882,827,000   
19891,276,000   
19901,237,826   
1991270,200   
1992142,650   
199394,878   
1994356,748   
1995583,521   
1996324,378   
1997242,035   
1998467,043   
19991,623,813   
20002,745,110   
20013,483,678   
20024,165,745   
20035,800,312   
2004636,939   
20053,037,387   
20065,488,761   
20073,537,554   
20083,153,573   
2009405,883   
2010334,916   
2011121,974   
2012524,724   
20138,704,642   
20143,634,882   
 

References and Related Online Materials

Area of Moderate to Severe Defoliation caused by Insects:National Forestry Database. (2010). Area within which Moderate to Severe Defoliation Occurs Including Area of Beetle-killed Trees by Insects and Province/Territory, 1975-2008 (Table 4.1). Forest Insects - National Tables. Last updated November 11, 2009. http://nfdp.ccfm.org/insects/national_e.php (accessed May 14, 2010).