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SAWFLY BIOLOGIES.: I. NEODIPRION TSUGAE MIDDLETON

Published online by Cambridge University Press:  31 May 2012

Geo. R. Hopping  and
H. B. Leech
Geo. R. Hopping
Affiliation:
Vernon, B. C.
H. B. Leech
Affiliation:
Vernon, B. C.
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Extract

The western hemlock sawfly, Neodiprion tsugae Middleron, first came to our notice from the Queen Charlotte Islands, British Columbia. In 1931, reports of the dying of hemlocks over large areas came from rangers and timber operators of this region. A survey conducted by Mr. W. G. Mathers of the Dominion Entomological Branch, in September and October of that year, indicated that the injury extended over approximately forty square miles. In 1932, the outbreak showed definite signs of subsiding, and had practically disappeared by 1933, although many trees were killed during the peak year of 1931, indicating that this is a primary enemy of western hemlock, and that outbreaks may be expected from time to time in the Pacific Northwest.

Type
Articles
Information
The Canadian Entomologist , Volume 68 , Issue 4 , April 1936 , pp. 71 - 79
Copyright
Copyright © Entomological Society of Canada 1936

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References

LITERATURE CITED

Middleton, William. 1921. LeConte's Sawfly, An Enemy of Young Pines. Jour. Agr. Res. 20, (10), 741–760.Google Scholar
Middleton, William. 1933. Five New Sawflies of the Genus Neodiprion Rohwer, Can. Ent., 65, (4), 77–79.CrossRefGoogle Scholar
Yuasa, Hachiro. 1922. A Classification of the Larvae of the Tenthredinoidea, 111. Biol. Monog., 7.Google Scholar