Forest Insect and Disease Survey; Ontario, 1965 - NFIS

E27
The examination of 71 leaf folds from three locations revealed an average of
22.9 per cent larval survival (Table 15).
TABLE 15
Survival of Phyllocolpa sp, in Leaf-folds of Trembling Aspen in the
Kapuskasing District in 1965
Per cent of folds with
Total No.
Location of folds Dead Eggs No Feeding but Feeding No eggs
(township) examined Eggs parasitized feeding no larva and larvae laid
Gurney 21 0.0 0.0 23.8 38.0 23.8 14.3
Torrance 34 2,9 0,0 0.0 61.7 32.4 2.9
# 138 16 0.0 6.3 25.0 37.5 12.5 18.7
Yellow-headed Spruce Sawfly, Pikonemaalaskensis (Roh.)
An increase in numbers of this insect occurred in 1965. A heavy infestation
was observed in open-grown white spruce trees along the Algoma central Railway in
Way Township where 50 per cent defoliation was recorded, Light infestations were
found on white and black spruce in Rogers Township and a light infestation occurred
on white spruce in Fenton Township • Small numbers were found in the remainder of the
district.
This sawfly was collected from June 28 until September 15. Larvae collected
late in the season appeared darker in colour than in earlier collections.
Northern Pine Weevil, Pissodes approximatus Hopk.
The presence of the northern pine weevil in the Kapuskasing District was
confirmed by collections in 1965. This weevil was collected from the lower stems
of three small white-pine trees in Wicksteed Township and from the lower stems of
two 7-foot Scots pine trees in the Spruce Falls Nursery.
White-pine Weevil, Pissodes strobi (Peck)
Very little change occurred in the incidence of weevilling in the Kapuskasing
District as a whole in 1965. A heavy infestation was recorded in a 9-year-old
white pine plantation in Wicksteed Township. Eighteen per cent of 50 red pine trees
examined in the Spruce Falls Nursery at Moonbeam were infested. Light infestations
occurred on white spruce in Studholme and Gurney townships and on jack pine in Lisgar
Township. A decline in numbers of infested trees occurred in four of five sample
plots (Table 16).