Forest Insect and Disease Survey; Ontario, 1965 - NFIS

D 34
Amber-marked Birch Leaf Miner, Profenusa thomsoni (Konow)
Little change in numbers of this leaf miner occurred in the district in 1965
(Table 13). Medium infestations were noted in pockets of suppressed white birch
in Brackin and Barclay townships in the northern part of the district.
Location
township)
TABLE 13
Summary of Damage to White Birch Foliage in the Chapleau District
from 1963 to 1965
Av. height of sample
trees in feet
Per cent of leaves mined
1963 1964 1965
Leeson 13 3 1 2
Garnet 16 3 1 0
Nimitz 14 2 1 1
8E 15 2 0 0
A Leaf Roller on Aspen, Pseudexentera oregonana Wlshm.
Roadside reproduction and fringe trees in Division 29 were moderately infested
by this leaf roller. High numbers of larvae were observed near Ramsay Creek in
Arbutus Township. In Division 69 areas of light infestation were centered around
Five Mile Lake in 11E Township, near Little Wenebegon Lake in 11C Township and at
Horton Lake in Township 9E.
Pine Tip Moth, Rhyacionia adana Heinrich
A recent problem which developed in the Department of Lands and Forests'
nursery in Chapleau was traced to this moth. Larvae were first collected in the
district in 1959 and under forest conditions population levels remain low. An
abundance of even-aged red pine in the seedbeds of the nursery provided a good
environment for the insect and it became a serious pest in red pine seedbeds.
Seven and one-half per cent of seedlings in fully-stocked seedbeds c taining
3-0 red pine were infested. Seedbeds with 15 per cent and 10 per cent stocking
suffered seedling damage of 21 per cent and 30 per cent respectively.
After a period of feeding on tissue of the old foliage, the larvae attack the
new shoots, and the buds are killed. Adventitious buds formed before autumn lack
terminals and poorly formed seedlings result. After larval feeding the insect
attaches itself to the root collar and spins a cocoon. A check of 100 infested
seedlings in seedbeds with 10 per cent stocking in late summer revealed 172
infested shoots and 159 cocoons attached to the root collars (see photograph).
Damage to seedlings in adjacent fully-stocked jack pine seed beds was light.
Pine Tortoise Scale, Toumyella numismaticum P. & M,
This scale insect showed a significant increase in population levels in 1965.
In Chapleau Township and Township 29 trees up to 5 inches d.b.h. were severely