Statistical data

1. Select area

2. Select year

Disturbance (Northwest Territories)
	2021	2020	2019	2018	2017	2016	2015	2014	2013	2012	2011	2010	2009	2008	2007	2006	2005	2004	2003	2002	2001	2000	1999	1998	1997	1996	1995	1994	1993	1992	1991	1990
Insects ^{Footnote 1}
Area defoliated by insects and containing beetle-killed trees (hectares)		400,690	809,620	749,149	486,741	519,868	513,837	348,439	129,106	270,847	82,879	314,885	56,205	66,846		35,040	35,040		1,304,479	2,402,898	1,959,409			837,588	487,556	489,317	59,500	370,300	53,600	90,000	130,000	102,600
Balsam fir sawfly
Forest tent caterpillar					1,045	135,984	102,901	1,200																		136,349	22,700
Gypsy moth
Jack pine budworm
Mountain pine beetle
Spruce beetle
Spruce budworm		107,760	215,753	391,615	245,859	122,473	174,263	76,400	53,539	61,457	41,861	83,702	56,205	66,846		35,040	35,040		1,304,479	2,402,898	1,959,409			837,588	487,556	352,968	36,800	370,300	53,600	90,000	130,000	102,600
Western spruce budworm
Other insects		292,930	593,867	357,534	239,837	261,411	236,673	270,839	75,567	209,390	41,018	231,183
Fires ^{Footnote 2}
Area burned (hectares)	156,630	21,139	105,167	22,177	1,033,077	255,524	722,107	3,421,313	555,059	304,535	329,685	350,927	10,337	308,789	445,129	61,397	218,133	517,356	127,821	27,089	116,762	177,836	561,035	1,458,960	126,531	371,545	2,843,366	3,027,315	864,286	36,950	225,466	104,617
Number of fires	140	70	147	63	268	193	257	388	257	289	201	224	60	240	184	167	261	299	160	85	128	275	172	399	105	350	218	653	473	285	331	236

Footnotes

Footnote 1

Insects

Source: National Forestry Database. Forest insects – Forest insects, Table 4 Area of moderate to severe defoliation (including beetle-killed trees) by insects. (accessed June 21, 2022).

Notes:

Forest area disturbed by defoliators (e.g., budworms, Lymantria dispar) includes only areas with tree mortality or moderate to severe defoliation. Defoliation does not always result in mortality. Several factors, including defoliation severity, duration, and frequency, or presence of other stressors (e.g., drought), can affect the level of mortality.
Forest area disturbed by bark beetles (e.g., mountain pine beetle, spruce beetle) is derived from aerial surveys that map trees that are dead or dying from successful beetle attack.
Summing the areas affected by more than one insect to create a grand total can result in an overestimate if more than one insect species occurs in the same stand in the same year. For example, in a mixedwood forest, spruce budworm may defoliate balsam fir in the same stand where forest tent caterpillar is defoliating the aspen trees.

Footnote 2

Fires

Sources:

National Forestry Database. Forest fires, Table 3.1.1, Number of fires by cause class. (accessed June 21, 2022).
National Forestry Database. Forest fires, Table 3.2.1, Area burned by cause class. (accessed June 21, 2022).

Note:

The National Forestry Database sources the latest year’s fire data from the Canadian Interagency Forest Fire Centre and all years prior from the Canadian Wildland Fire Information System.