Annual District Reports: Forest Insect and Disease Survey ... - NFIS

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Patches of light defoliation occurred at Falcon, Caddy, White,
Red Rock, and Brereton lakes in the Whiteshell Forest Reserve and from
Rennie to Whitemouth, from Star Lake to the Manitoba-Ontario boundary,
from Wallace Lake to Long and. Beresford lakes, and at Sasaginnigak and
Dogskin lakes.
Small patches (usually 5 acres or less) of moderate defoliation
occurred from Big Whiteshell Lake to Lone Island Lake, along the north
and west Shore of Crowduck Lake, between Pointe du Bois and Bird Lake
and southeastward to Eaglenest Lake, around Flintstone, Tooth and
Moose lakes, along the north shore of Siderock lake and north to
Aikens Lake, between Night-owl and Horseshoe lakes in the Berens River
system, and around Eardley, Wrong and Weaver lakes and from Lebrix
Lake to Gunisao Lake.
Patches of moderate to severe defoliation were recorded at
Big Whiteshell Lake, Green Lake and throughout a 2 mile by 1 mile
extension of this infestation between Big Whiteshell Lake and Crowduck
Lake, in the Pointe du Bois area from the southeast end of George
Lake north to Shatford Lake, west almost to the boundary of the
Whiteshell Forest Reserve and east to Forbes Lake and Lamprey Falls
on the Winnipeg River, throughout the Bird Lake infestation which
covered the area from immediately north of Eaglenest Lake at the
Manitoba-Ontario boundary northwest to Blase and Bernic Lakes to a
point about 5 miles southeast of Maskwa Lake, east surrounding Bird
Lake and northeast to Elbow and MacGregor lakes and south to Star
Lake. Moderate to severe defoliation also occurred on the Bear
River Road east of Camp 2L, along the Sandy River east to Owl Lake
and north to Manigotogan, along the north and east shores of Black
Lake, at Happy, Manigotogan, Caribou, and Wanipigow lakes and along
the Wanipigow River watersheds to Lake Winnipeg. Similar defoliation
occurred in a narrow band surrounding Gem and Garner lakes, within a
3 by 1 mile area about 8 miles east of Bissett, and near Little
Grand Rapids and along the east and southeast shores of Family Lake.
Traces of defoliation occurred on trembling aspen from East
Braintree to the vicinity of Moose Lake in the southeastern part of
Manitoba. The current infestation in Ontario extended westward and
caused moderate to severe defoliation with a 5 x 2 mile area southwest
of Waugh, and on the peninsula between Indian and Snowshoe bays.
An egg-band survey was carried out in the fall to determine
the probable extent and intensity of infestation in 1964, and the
results are shown in Table 1,