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Studies on the Starvation of Last-Instar Larvae of the Larch Sawfly, Pristiphora erichsonii (Htg.) (Hymenoptera: Tenthredinidae)1

Published online by Cambridge University Press:  31 May 2012

R. J. Heron
R. J. Heron
Affiliation:
Forest Biology Laboratory, Winnipeg, Man.
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Extract

Larvae of the larch sawfly, Pristiphora erichsonii (Htg.), feed on the foliage of conifers of the genus Larix. In Manitoba and Saskatchewan, where the studies described here were conducted, the native host is tamarack, L. laricina (Du Roi) K. Koch. At outbreak population levels larval feeding commonly causes complete defoliation. Trees show a marked reduction in foliage production after three or four successire vears af severe defoliation (6). As a consequence, larval starvation is commonly associated with declining host vigour. Starvation reduces the population size directly by causing larval mortality and indirectly by reducing the reproductive capacity of the partially starved survivors. This paper deals primarily with the measurement of the sub-lethal effects of starvation during the last larval stadium as studied in laboratory-reared and field-collected insects.

Type
Articles
Information
The Canadian Entomologist , Volume 87 , Issue 10 , October 1955 , pp. 417 - 427
Copyright
Copyright © Entomological Society of Canada 1955

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References

REFERENCES

1.Bloor, W. R. 1943. Biochemistry of the fatty acids and their compounds, the lipids. Reinhold Publ. Corp., New York.Google Scholar
2.Fraenkel, G. and Chang, Peh-I.. 1954. Manifestations of a vitamin BT (Carnitine) deficiency in the larvae of the meal worm Tenebrie molitor L. Physiol. Zool. 27: 40–56.CrossRefGoogle Scholar
3.Glick, D. 1949. Techniques of histo- and cytochemistry. Interscience Publishers, Inc., New York.Google Scholar
4.Heron, R. J. 1951. Notes on the feeding of larvae of the larch sawfly, Pristiphora erichsonii (Htg.) (Hymenoptera: Tenthredinidae). 82nd Ann. Rep. Entomol. Soc. Ont. 67–70.Google Scholar
5.Kozhantschikov, I. W. 1938. Physiological conditions of cold-hardiness in insects. Bull. Ent. Research. 29: 253–262.CrossRefGoogle Scholar
6.Lejeune, R. R. 1951. Some ecological factors governing populations of the larch sawfly, Pristiphora erichsonii (Htg.) Can. Ent. 83: 152–156.CrossRefGoogle Scholar
7.Lejeune, R. R., Fell, W. H., and Burbidge, D. P.. 1955. The effect of flooding on development and survival of the larch sawfly, Pristiphora erichsonii (Tenthredinidae). Ecology 36: 63–70.CrossRefGoogle Scholar
8.McDonald, S., and Brown, A. W. A.. 1952. Cytochrome oxidase and cyanide sensitivity of the larch sawfly during metamorphosis. 83rd Ann. Rept. Entomol. Soc. Ont. 30–34.Google Scholar
9.Prebble, M. L. 1941. The diapause and related phenomena in Gilpinia polytoma (Hartig) IV. Influence of food and diapause upon reproductive capacity. Can. J. Res. D. 19: 417–436.CrossRefGoogle Scholar
10.Reeks, W. A. 1954. An outbreak of the larch sawfly (Pristiphora erichsonii (Htg.)) (Hymenoptera: Tenthredinidae) in the Maritime Provinces and the role of parasites in its control. Can. Ent. 86: 471–480.CrossRefGoogle Scholar
11.Smith, S. G. 1955. Cytogenetics of obligatory parthenogenesis. Can. Ent. 87: 131–135.CrossRefGoogle Scholar