Forest Insect and Disease Survey; Ontario, 1965 - NFIS

township
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increase in population levels of this sawfly compared with 1964 (Table 5). A total
of twelve locations was sampled in 1965 and sawflies were found at all points. In
Joan and Olive townships small numbers of the insect were found on black spruce
trees.
TABLE 5
Summary of European Spruce Sawfly Larval Counts from White Spruce Trees
at Six Points in the North Bay District from 1963 to 1965
Location
township
Av. d.b.h. o
sample trees
in inches
Total no. of larvae per
15-tray sample
1963 1964 1965
Springer 6 17 7 84
Ratter 4 18 61 128
MacPherson 6 22 46 144
Widdifield 9 20 14 53
French 6 20 21 76
Papineau 9 14 9 77
Eastern Tent Caterpillar, Malacosoma americanum (F.)
High population levels of the eastern tent caterpillar occurred throughout the
southern part of the district in 1965 (Table 6). Roadside clumps of cherry, fruit
and ornamental trees were heavily defoliated in the North Bay-Lavigne-Sturgeon Falls-
Warren area. One colony was found at Marten River in Sisk Township, the most
northerly recovery point in the district to date. (see photograph)
TABLE 6
Summary of Eastern Tent Caterpillar Colony Counts per mile of Roadside
at Five Points in the North Bay District from 1963 to 1965
a ion
Total no. of tents per mile of roadside
63 16: i' 6
East Ferris 22 10 15
Widdifield 18 16 24
Dunnet 10 10 15
MacPherson 15 22 58
Springer 10 4 16
Forest Tent Caterpillar, Malacosoma disstria Hbn.
The forest tent caterpillar infestation in the wouthwestern part of the
district increased in extent and intensity in 1965. In the West Arm-Lake Nipissing
area moderate to severe defoliation occurred through most of the townships of Dunnet,
Casimir Haddo, Martland, Falconer, Loudon, Latchford, Bertram, MacPherson, Caldwell
and Springer (Map 1). Poplar stands were moderately defoliated in the southern part
of Hugel and Badgerow townships and light defoliation occurred in the wouthwestern
part of Field Township. A relatively small area of moderate to heavy infestation