Forest Insect and Disease Survey; Ontario, 1965 - NFIS

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E21
TABLE 5
summary of Larval counts of the Birth Skeletonizer on White Birch
Foliage in the Kapuskasing District in 1964 and 1965
Total No. of larvae Av. No, of larvae
Location Date per 25 leaves per leaf
(township) 1964 1965 1964 1965 1964 1965
Seaton Aug. 20 Aug, 31 46 37 l.8 1.5
Wicksteed " 29 " 29 62 71 2.5 2.8
0'Brien
" 31 " 31 76 85 3.0 3.4
Stoddart
McMillan
Sept. 4 Sept. 3 16
12
0.6 0.5
i
"
4
i
" 3 16
15
0.6
0.6
"
3
Gill
4
23 16 0.9 0.6
Studholme " " 3
4 106 47 4.2 1.9
Larch casebearer, coleophora laricella (Hbn.)
The first record of the larch casebearer in Kapuskasing District was recorded
in Fauquier Township in 1961 but intensive searching since that time has produced
no extension of distribution. Quantitative sampling in Fauquier Township over the
past four years revealed a gradual increase in numbers. The average number of larvae
per 18-inch branch tip increased from 0.4 in 1962 to 5.8 in 1965.
A mass collection of pupae taken from Fauquier in the early summer of 1965
revealed that 83.3 per cent of the larvae were parasitized by the introduced parasite
A athis pumila (Rata.). The closest point at which this parasite was released was
380 miles south of Fauquier,
European Spruce Sawfly, Diprion hercyniae (Htg.)
The European spruce sawfly was collected for the first time in the district in
1961. In 1965 more larvae were collected in beating mat samples than in past years
but few were found elsewhere in the district,
A Looper on Conifer, Eupithecia filmata Pears.
This looper is found commonly from coast to coast in canada but 1965 marked
the first year that large numbers of collections have been recorded in the Kapuskasing
District. The predominant host in canada is white spruce (canada Department of
Forestry, Volume 3, Forest Lepidoptera of Canada, Recorded by the Forest Insect Survey),
but in the Kapuskasing District the insect was found in about equal numbers on white
spruce and balsam fir and less commonly on black spruce. Light infestations occurred
on white spruce in Way Township aid on balsam fir in Rogers Township. Small numbers
were collected on beating mat samples from the remainder of the district.