here. - Ministry of Forests, Lands and Natural Resource Operations

larval density % mortality
(# larvae/m2 foliage) Uncorrected Abbott’s corrected
Location pre-spray 1st post 2nd post 1st post 2nd post 1st post 2nd Table 7. Summary of 2012 pre- and post-spray sampling of western spruce budworm in the Thompson
Okanagan Region. The table lists by site and treatment the larval density (number of larvae per m
post
Glenrosa treated 175.0 47.9 28.5 72.6 83.7 67.7 77.9
Glenrosa control 105.4 89.3 77.6 15.3 26.4
Sheep Cr treated 302.6 118.3 58.4 60.9 81.8 37.3 71.3
Sheep Cr control 327.2 204.1 207.2 37.6 36.7
McKinney treated 212.8 87.1 4.1 59.1 98.1 62.1 26.7
McKinney control 227.7 246.2 6.0 -8.1 97.4
Orofino treated 300.2 285.6 7.5 4.9 97.5
Carmi treated 179.2 74.6 80.4 58.4 55.1
Duffy treated 86.4 17.6 - 79.6 - 88.4
Duffy control 35.5 62.3 - -75.4 -
Swakum treated 120.2 57.7 115.4 52.0 4.0
Swakum-M6* 21.2 82.3
Kirby treated 284.8 120.5 62.2 57.7 78.2 35.5 64.2
Kirby control 292.6 192.1 178.6 34.4 39.0
Tolman treated 98.9 8.8 - 91.1 - 81.6
Tolman control 258.3 125.2 - 51.5 -
Sackum-1 treated 292.2 16.6 46.6 94.3 84.1
Sackum-2 347.8 20.0 52.5 94.3 84.9
Pimainus-1 treated 206.6 126.5 4.0 38.7 98.1
Pimainus-2 161.9 98.1 2.3 39.4 98.6
Average 211.3 105.2 59.5 45.2 71.6 62.1 60.0
Maximum 347.8 285.6 207.2 94.3 98.6 88.4 77.9
Minimum 35.5 8.8 2.3 -75.4 4.0 35.5 26.7
* An additional post-spray sample was taken in a different location within the spray block
2
foliage), the percent larval mortality (percent), and Abbott’s corrected mortality (percent) at the three
sampling times.
Figure 3. Density of western spruce budworm larvae
(per m 2 foliage) in four target areas comparing treated
and untreated control sites at the pre-spray, first postspray
and second post spray time. Kirby and Tolman
are in the Cascades District and Glenrosa and Sheep
Creek are in the Okanagan Shuswap District.
Ministry of Forests, Lands and Natural Resource Operations, Kamloops, B.C.
50
Figure 4. Distribution and abundance of western
spruce budworm larval instars in the Sackum spray
block at the three sampling times. Larval instars are
as follows: L3=3 rd instar; L4=4 th instar; L5=5 th instar;
L6=6 th instar.