Forest Insect and Disease Survey; Ontario, 1965 - NFIS

E 22
A Root Weevil, Hylobius warreni (Wood)
Positive identification of this root weevil was obtained in the Kapuskasing
District in 1965. Two Scots pine trees with discoloured foliage were examined at
the Spruce Falls Nursery at Moonbeam. Adult root weevils were located in pitch
impregnated tunnels in the soil surrounding the root collar.
Aspen Blotch Miner, Lithocolletis salicifoliella cham.
The results of quantitative sampling reflected the rise in population levels
of this insect that occurred in 1965 (Table 6). Roadside and open-grown trembling
aspenregenerationwere most commonly infested. Heavy infestations were observed in
0'Brien, Gurney and Torrance townships. Light infestations occurred in Rogers and
Nansen townships and in Township 138. The insect was collected from willow at two
locations in Fauquier Township. Small numbers were found on trembling aspen
regeneration in the remainder of the district.
TABLE 6
Summary of Aspen Blotch Miner counts Based on the Examination of 100
Leaves Taken at Random from Three Trembling-aspen Trees at Each Location
Av. height Per cent of
Total No, of mines
Location of trees leaves mined
per 100 leaves
(township) in feet 1963 1964 1965 1963 1964 1965
Wicksteed
9
20 0 3
23 0 3
O'Brien
12
24
14 6
27
8
Gurney 15 16 1 6 18 1 6
Torrance 10 0 3 7 0 3 8
Gill 12 30 1 2 33 1 3
Forest Tent caterpillar, Malacosoma disstria Hbn.
The last forest tent caterpillar outbreak in the Kapuskasing District occurred
from 1948 to 1954.
A small area of defoliation was reported in Bicknell Township in 1964 by
A. Baxter, Department of Lands and Forests and subsequent ground checks in the spring
of 1965 produced small numbers of 1964 egg bands. Defoliation was severe in this
area in 1965 and moderate to severe defoliation occurred in the adjoining townships
of Boyce, Burrell, Shuel and Mulloy. Immediately north of Rogers Township poplar
stands in an area approximately 30 square miles were severely defoliated. A small
pocket of heavy infestation was observed in Foch Township.