Forest Insect and Disease Survey; Ontario, 1965 - NFIS

D 42
Aspen Blotch Miner, Lithocolletis salicifoliella Chamb.
Despite a noticeable decline in population levels, a large area of light to
heavy infestation persisted in approximately 50 townships in the central part of
the district. Considerable leaf damage was observed on trembling aspen regeneration
and small trees on exposed sites at many locations (Table 12). Only occasional
infested leaves were found in the eastern part of Division 72 (see map).
The results of foliage sampling at ten locations in 1964 and 1965 are summarized
in Table 13.
TABLE 12
Summary of Leaf Damage Caused by the Aspen Blotch Miner
in the Gogama District in 1964 and 1965
Based on Samples of 100 Leaves
at 13 Typal Locations
Location Per cent leaves No. of mines per Av. no. of
(township) infested infested leaf per leaf
1 6 196 1 6 1964 1965
Carter 58 47 3.1 1.5 1.80 .72
Champagne 22 18 1.1 1.4 .25 .31
Coppell 91 12 4.1 1.3 3.71 .16
Garibaldi* 3 1 1.0 1.0 .03 .01
Hellyer 82 73 3.9 4.2 3.20 3.05
Invergarry 57 79 1.6 2.1 .92 1.69
Lemoine 94 78 2.2 4.9 2.11 3.82
Mattagami* 6 2 1.1 1.3 .06 .03
Mont calm 49 41 1.6 1.4 .78 .57
Oates 64 16 1.5 2.3 .97 .36
Pinogami 82 48 6.0 2.1 4.90 1.03
St. Louis 43- 35 1.4 1.5 .58 .54
Silk 67 67 2.0 3.5 1.36 2.32
* Based on 1,000 leaves to insure greater accuracy.