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History of the Larch Sawfly, with Notes on Origin and Biology1, 2

Published online by Cambridge University Press:  31 May 2012

H. C. Coppel  and
K. Leius
H. C. Coppel
Affiliation:
Entomology Laboratory, Belleville, Ontario
K. Leius
Affiliation:
Entomology Laboratory, Belleville, Ontario
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Extract

The larch sawfly, Pristiphora erichronii (Htg.), is currently considered a major forest insect pest in Canada. At the present time within Canada, the sawfly reacts to parasitism by Mesoleius tenthredinis Morley in two ways. In Manitoba and Saslratchewan the sawfly encapsulates approximately 100 per cent of the parasite eggs deposited, whereas in British Columbia encapsulation rarely exceeds four per cent (Muldrew, 1953). The reasons for the difference in degree of encapsulation are apparently unknown; however, since the origin of the sawfly itself is obscure, the possibility exists that a native species, an introduced species, Or a combination of both may he present, or that geographical or ecological units may have arisen. Studies now under way by officers of the Forest Biology and Entomology divisions are attacking the problem of identity and origin following the pattern established for the European spruce sawfly, Diprion hercyniae (Htg.). In this instance, as with the larch sawfly, parasites were introduced on the assumption that the pest had been introduced from Europe. Critical investigations by Reeks (1941) and Balch, Reeks, and Smith (1941), involving morphological, cytological, and other biological characters, showed that the species occurring in North America was one of two species common in Europe, and previously referred to there as Gilpinia polytoma (Htg.). Balch et al. (1941) showed that D. hercyniae had been introduced into North America.

Type
Articles
Information
The Canadian Entomologist , Volume 87 , Issue 3 , March 1955 , pp. 103 - 111
Copyright
Copyright © Entomological Society of Canada 1955

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