Forest Insect and Disease Survey; Ontario, 1965 - NFIS

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Jack-pine Needle Miner, Exoteleia pinifoliella (Chamb.)
Medium infestations of this insect were observed in clumps of jack pine near
Parry Sound in McDougall Township, Bear Lake in Monteith Township, and Huntsville
in Brunel Township, Approximately 25 per cent of the needles on past year's shoots
were infested at each location. Light infestations were common in Boulter,
Harrison, and Burpee townships.
Eastern Tent Caterpillar, Malacosoma americanum F.
Light infestations of this insect that occurred along Highway 69 from Parry
Sound to the French River for the past six years increased to heavy intensity in
1965. At one location in Harrison Township, counts of initial tents along a
measured mile of roadside were the highest recorded in the district for a number of
years (Table 7). Population levels declined slightly in the southern part of the
district.
TABLE 7
Summary of Eastern Tent Caterpillar Colony Counts
in the Parry Sound District 1960-1965
Location
to hi
lint
No, of rimer tents
area 1 60 1 61 1962 196 1 . 6 1 . 6
Franklin square chain plot 7 13 18 11 8 3
Stephenson
19
3 17 11 14 11 0
McAulay 36 47 32 23 3 7
Chisholm
0 1 3 3 1 2
Boulter o 2 0 3 2 3
McLean mile of roadside 79 91 63 42 28 31
Brunel
" "
28 31 18 14 7 2
Stephenson
It " "
21 22 27 21 14 2
" It
Wood
It
31 53 62 40 29 27
McDougall
H
18 44 51 31 17 14
MacKenzie
II "
16 29 24 11 8 6
"
Harrison
II - - -
- 181
Forest Tent Caterpillar, Malacosoma disstria Hbn.
Population levels of this insect increased in the district in 1965 compared
with 1964. Heavy infestations occurred in the Muskoka Lakes area, where sugar maple,
red oak, white elm, and trembling aspen were severely defoliated. In the northern
part of the district a band of heavy infestation extended from the Dokis Indian
Reserve along the French River eastward to North Himsworth Township. The total area
of infestation in the district was approximately 970 square miles (see map).
Mass collections of cocoons were made to determine the percentage of parasitism,
predation, disease, and moth emergence (Table 8).