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Forest Insect and Disease Survey; Ontario, 1965 - NFIS

Forest Insect and Disease Survey; Ontario, 1965 - NFIS

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B 32<br />

TABLE 12<br />

Summary of European Spruce Sawfly Larval Counts Taken<br />

from White Spruce Trees at Seven Points in the<br />

Lake Huron District from 1963 to <strong>1965</strong><br />

Location<br />

townshi<br />

Av, d.b.h. of<br />

sample trees<br />

in inches<br />

Total no. larvae per<br />

15-tray sample<br />

Date<br />

sam led<br />

Albemarle<br />

St. Edmunds<br />

Glenelg<br />

Holl<strong>and</strong><br />

Woolwich<br />

Euphrasia<br />

Minto<br />

6<br />

6<br />

6<br />

4<br />

4<br />

5<br />

5<br />

14<br />

13<br />

62<br />

45 47 78<br />

3<br />

9<br />

86 82<br />

6<br />

10<br />

43<br />

9<br />

3<br />

30<br />

5<br />

27<br />

11<br />

Sep 14<br />

Sep 14<br />

Sep 28<br />

Sep 13<br />

Sep 20<br />

Sep 23<br />

Sep 28<br />

Introduced Pine Sawfly, Diprion similis (Htg.)<br />

Numbers of larvae declined generally for the second consecutive year. This<br />

trend was most evident in Scots pine windbreaks in Keppel <strong>and</strong> St. Vincent townships<br />

(Table 13). R<strong>and</strong>om sampling revealed a maximum of 27 larvae per sample.<br />

TABLE 13<br />

Summary of Introduced Pine Sawfly Larval Counts Taken<br />

at Seven Locations in the Lake Huron<br />

District from 1963 to <strong>1965</strong><br />

Location<br />

township.<br />

Tree<br />

s.-cies<br />

Av, d.b.h.<br />

in inches<br />

Total no. larvae per<br />

1963 1964 <strong>1965</strong><br />

St. Vincent<br />

Artemesia<br />

Minto<br />

Keppel<br />

Woolwich<br />

Beverly<br />

Euphrasia<br />

scP 5 126 25 6<br />

wP 4 9 7 8<br />

wP 5 3 7 1<br />

scP 7 42 26 16<br />

wP 6 3 10<br />

wP 4 4 2 1<br />

scP 4 13 14 6

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