Operational Success of Verbenone Against the Mountain Pine Beetle in a Rural Community

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Figure 1.
Map of Lac le Jeune, B.C., showing five subdivisions.
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Figure 2.
Detailed maps of verbenone-treated subdivisions at Lac le Jeune (A: North Shore East; B: Townsite, Little Lake, and Lookout) showing individual residential lots (shaded) that sustained mass attack in 2005 on one or more lodgepole pines, 25 m (27.5 yd) wide verbenone-treated buffer zones (dark shading) on Crown forest land, and control areas (light shading) on Crown forest land extending at least 100 m (110 yd) beyond the verbenone buffer zones.
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Figure 3.
Comparison of percentages of available lodgepole pines 17.5 cm or greater (7 in) dbh mass attacked by the mountain pine beetle in untreated forests on Crown land, in verbenone-treated buffer strips on Crown land, and in residential properties in four subdivisions at Lac le Jeune, B.C. Numbers in parentheses below bars are the number of available trees. Bars within a subgraph with the same letter are not significantly different, χ² test for multiple proportions, P ≤ 0.05.

Table 1.

Site characteristics and verbenone pouch treatment density in four subdivisions at Lac le Jeune, B.C.

Characteristics and treatment	Location	Control area	Verbenone buffer	Residential area	All areas combined^{^z}
Area [ha (A)]	North Shore East	6.25 (15.4)	1.56 (3.9)	8.64 (21.3)	16.45 (40.6)
	Townsite	4.88 (12.1)	1.25 (3.1)	6.12 (15.1)	12.25 (30.3)
	Little Lake	1.50 (3.7)	0.29 (0.7)	3.58 (8.8)	5.37 (13.3)
	Lookout	0.82 (2.0)	—	2.78 (6.9)	3.60 (8.9)
No. red trees/ha (/A)^{^y}	North Shore East	—	—	—	12.8 (5.2)
	Townsite	—	—	—	36.8 (14.9)
	Little Lake	—	—	—	29.0 (11.7)
	Lookout	—	—	—	33.0 (13.4)
No. available green trees ≥17.5 cm	North Shore East	288.0 (116.6)	214.1 (86.7)	198.1 (80.2)	233.8 (94.7)
(6.9 in) dbh/ha (/A)	Townsite	520.9 (210.9)	626.4 (253.6)	247.4 (100.2)	395.0 (159.9)
	Little Lake	203.3 (82.3)	96.6 (39.1)	207.0 (83.8)	200.0 (81.0)
	Lookout	395.1 (160.0)	—	185.3 (75.0)	233.1 (94.4)
No. verbenone pouches/ha (/A)	North Shore East	—	70.5 (28.5)	62.8 (25.4)	64.0 (25.9)
	Townsite	—	47.2 (19.1)	57.4 (23.2)	55.6 (22.5)
	Little Lake	—	79.3 (32.1)	44.7 (18.1)	47.3 (19.1)
	Lookout	—	—	49.3 (20.0)	49.3 (20.0)

↵^zControl area excluded for no. verbenone pouches/ha.
↵^yRed trees scarce in residential areas because most red trees removed. A beetle emerging from a red tree in one of the three areas is capable of attacking any living tree in all three areas. Therefore, red trees/ha calculated for all three areas combined.