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

we S t e r n he M l o c k lo o P e r, la m b D i n a f i s c e l l a r i a l u g u b r o s a
Defoliation by western hemlock looper was up slightly to 8,100 hectares. 2012 may be the peak year in this
outbreak cycle, as trapping results and larval sampling both indicate a population decline. The affected area
included stands in the Quesnel Lake, Hobson Lake, and Seymour River areas, with additional scattered infestations
mapped in the Salmon Arm, Mabel Lake, Rogers Pass, and Lake Revelstoke areas.
Approximately 11,981 hectares of high priority western hemlock forest was treated with Foray 48B (B.t.k.)
between July 6 and July 11, 2012, in the Thompson Okanagan and Kootenay Boundary Regions. A full report
on the control program and population monitoring results can be found in the Special Projects section of this
report.
tw o -Ye a r cY c l e Bu d w o r M, ch o r i s t o n e u r a b i e n n i s
Defoliation levels decreased slightly when compared to the last “on” year in this defoliator’s life cycle in 2010,
from 70,700 hectares to 62,360 hectares. Defoliation was widespread across much of the eastern Quesnel TSA,
and the Raft River, Mad River, and Wells Gray Park areas in the Kamloops TSA. An operational spray trial to
evaluate the efficacy of B.t.k. for control of two-year cycle budworm was carried out in the vicinity of Mount
Tom in the Quesnel District. Trial results can be found in the Special Projects section of this report.
PI n e ne e d l e Sh e at h MI n e r, Ze l l a r i a h a i m b a c h i
Pine needle sheath miner was again detected in several
lodgepole pine plantations in the Okanagan, Kamloops,
and Quesnel TSAs. In total, 517 hectares in 15 separate
stands were affected. Defoliation levels remained light
to moderate, and no permanent damage or tree mortality
is expected at current damage levels. However, impacts
from prolonged outbreaks of this insect have not been
quantified and weakened trees may be more susceptible
to attack by secondary bark beetles.
we S t e r n fa l S e he M l o c k lo o P e r,
ne p y t i a f r e e m a n i
During ground sampling in areas affected by western
spruce budworm near Gold Bridge in the Lillooet TSA,
high populations of western false hemlock looper were
seen in several stands, which likely contributed to high
damage levels in many of the more severe pockets of
defoliation mapped in this area.
Ministry of Forests, Lands and Natural Resource Operations, Kamloops, B.C.
13
Lodgepole pine defoliated by pine needle sheath
miner. Inset: closeup of feeding damage.