Forest Insect and Disease Survey; Ontario, 1965 - NFIS

0 5
STATUS OF INSECTS
Birch Skeletonizer, Bucculatrix canadensisella Chain.
Population levels of the birch skeletonizer declined for the third consecutive
year. Pockets of light defoliation occurred through the northeastern part of the
district but birch stands in other areas were relatively free of infestation in 1965.
Larch Casebearer, Coleophora laricella Hbn,
Slight decreases in population levels of this insect were recorded at most
permanent sample stations in 1965 (Table 4). Few larvae were found in Pedley and
Beaucage townships where light infestations occurred in 1963 and 1964.
TABLE 4
Summary of Larch Casebearer Larval Counts Made At Seven Points
in the North Bay District from 1963 to 1965
Note: Counts were based on the examination of four 18 "-branch tips from each of
four trees at each point.
Location
township.
Av. d.b..h. of
sample trees
in inches
Av. no. Av. no. of larvae per tip
196 196 196
Strathcona 5 3.0 5.4 3.1
Olive 4 1.5 3.4 2.9
Widdifield 2.2 3.8
Bonfield 5 2,4 4.2 0.9
Mattawan 5 1.9 0.3 0.1
Bastedo
5 1.4 2.2 0.0
Gillies Limit 4 1.5 8.1 5.5
Jackpine Budworm, Choristoneura pinus Free
An appreciable increase in the numbers of this budworm occurred in 1965.
Pockets of light infestation were observed in jack pine stands in Dana, Badgerow
and MacBeth townships and larvae were found commonly in beating samples in Loudon,
MacPherson, Bonfield, Haddo and Kirkpatrick townships. (see photograph)
Cone Beetles, Conophthorus coniperda (Schz,) and
Conophthorus resinosae Hopk.
A heavy infestation of these beetles recurred along the Northeast Arm of Lake
Temagami in Strathcona Township. As in 1964 white pine trees were attacked by
Conophthorus coniperda and red pine by Conophthorus resinosae. Mature and overmature
trees were most heavily infested, with less damage occurring on understory
trees in the area. Both twigs and cones are destroyed by these insects.
European Spruce Sawfly, Diprion hercyniae (Htg.)
Quantitative sampling at permanent sampling stations showed an appreciable