Forest Insect and Disease Survey; Ontario, 1965 - NFIS

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TABLE 11
Summary of Damage by the Pitch Nodule Maker in the Kapuskasing
District in 1965
Location Av. d,b,h. No, of trees
(township) in inches examined
of
nodules per tree
Fenton 2 50 30 0.6
Gurney 3 10 0.1
Gill 25 1 0.04
McMillan 100 1 0.01
A Leaf folding Sawfly on Balsam Poplar, Phyllocolpa sp.
Medium to heavy infestations of this leaf-folding sawfly recurred on balsam
poplar regeneration. Infestations were generally confined to trees up to 15 feet
in height but small numbers were found on the lower crown of larger trees.
Scattered medium to heavy infestations were found in all divisions and light
infestations occurred in Fauquier and Studholme townships.
A slight increase in the incidence of leaf folds over 1964 occurred at
sample locations (Table 12).
TABLE 12
Summary of Damage to Balsam Poplar Foliage in the Kapuskasing
District in 1964 and 1965
Av height No. o o, o
Location or trees leaves per tree folded leaves
(township) in feet 1964 1965 1964 1965
Fauquier 6 276 305 63
Mccrea 6 340 286 93
McMillan 7 407 423 115
Seaton 6 283 323 72
en o eaves
folded
1964 1965
73 22,8 23. 8
87 27,3 30.4
127 28,2 30.0
87 25.4 26,9
A comparison of larval survival between 1964 and 1965 showed that slightly
over 14 per cent more larvae reached maturity in 1964 than in 1965. A total of 217
folded' leaves in 1964 had an average of 25.7 per cent survival and in 1965 a total
of 256 folded leaves showed an average survival rate of 39.8 per cent,
Larval survival in 1965 is summarized in Table 13,