Forest Insect and Disease Survey; Ontario, 1965 - NFIS

Black-headed Jack-pine Sawfly, Neodiprion pratti banksianae Roh.
Location
townshi.
Av. d.b.h. of
sample trees
in inches
C8
In 1963 and 1964 light infestations of this sawfly occurred in jack pine stands
along the upper part of the Sturgeon River watershed. Pockets of reproduction in
cut over tracts were heavily defoliated at many points in Sheppard, Clary and Afton
townships. In 1965 an abrupt decline in population levels of the sawfly occurred
and few colonies were found in the area. Scattered colonies were observed in Dana,
Kirkpatrick, Loudon and Haddo townships and along shorelines and on islands in Rabbit,
Banks, Diamond, Nipissing, Obabika and Temagami lakes (Table 9).
TABLE 9
Summary of Black-headed Jack-pine Sawfly Larval Colony Counts
at Five Points in the North Bay District from 1963 to 1965
Note: Counts were based on the examination of 10 jack pine trees at each point.
No. of trees
Av. no. of colonies
infested
per infested tree
16 16 1965 16 196 16
Sheppard 2 10 10 1 4 4 1
Afton 2 5 10 1 3 3 1
Joan 3 - 4 0 2 0
Cynthia 2 10 10 0 3 3 0
Briggs 2 3 5 0 2 1 0
Red-headed Pine Sawfly, Neodiprion lecontei (Fitch)
Mixed pine plantations in Springer, Phelps and Widdifield townships were lightly
infested with this sawfly in 1965 (Table 10). Scattered colonies were observed in
red pine plantings in the McLaren Management Unit and on islands in Lake Temagami.
TABLE 10
Summary of Red-headed Pine Sawfly Larval Colony Counts at Three Points
in the North Bay District in 1965
Note Counts were based on the examination of 200 trees at each point.
Av, height of
Av. no. colonies
Location sample trees Per cent of trees per infested
township in feet infested tree
Phelps 6 12 3
Widdifield 7 15 2
Springer 12 5 1
Red-pine Sawfly, Neodiprion nanulus nanulus Schedl.
A pronounced decline in population levels of this sawfly occurred in 1965 (Table
11). Scattered colonies were observed in red and jack pine stands through