Forest Insect and Disease Survey; Ontario, 1965 - NFIS

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TABLE 2
Summary of Incidence of White Pine Blister Rust and Tree Mortality
at Four Points in the South-central Region in 1965
Location township
Boulter
Strathy
Papineau
McLaren
Total no. trees
examined
18
22
24 14
No. rusted
livi •
6
5
8
2
No. rusted
dead
1
2
2
0
Totals:
Incidence %
78 21
25.6
5
6.4
Frost Damage
Severe frosts in late May and early June caused extensive injury to conifers in
low-lying areas at many locations in the region. Over 50 per cent of the new foliage
of white spruce trees was damaged in a plantation in Ryerson Township, Parry Sound
District. Varying degrees of injury to deciduous trees, particularly black ash, was
observed at several points in the region.
TABLE 3
Other Noteworthy Diseases in the South-central Region,1965
. . . . . . • .' •
Organism Hostfl Remarks
Apioporthe apiospora
(Ell & Ev.) Wehn.
Chrysomyxa ledicola Lagerh.
wE
bS
Light infection at one location
in Wood Twp., , Parry Sound District
Varying degrees of infection in
many stands throughout the North
Bay District
Ciborinia whetzelii (Sea v .) Seav . tA Pockets of heavy infection at
numerous locations, particularly
in the central part of the North
Bay District
Cronartium comptoniae Arth. jP Widely distributed throughout the
North Bay District, 14 per cent
infected in Hugel Twp., three per
cent infected in Bucke Twp.
Cytospora chrysosperma (Pers.) Fr. tA, W Found commonly on these hosts
throughout the region
Cytospora friesii Sacc. bF Infected trees with dead tops
scattered through the central part
of the North Bay District
Cytospora sp. Mo, Al, W, Common throughout the region
cCh, rM, sM