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LOW TEMPERATURE AS A FACTOR IN THE MORTALITY OF EGGS OF MANTIS RELIGIOSA L.*

Published online by Cambridge University Press:  31 May 2012

R. W. Salt  and
H. G. James
R. W. Salt
Affiliation:
Lethbridge, Alta., and Belleville, Ont.
H. G. James
Affiliation:
Lethbridge, Alta., and Belleville, Ont.
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Extract

In the district around Belleville, Ontario, the eggs of Mantis religiosa are deposited during the end of August and throughout September. Some embryonic growth occurs after the eggs are laid and before they enter diapause for the winter. Many of the eggs which have over-wintered, however, fail to continue their development so that the percentage of hatch in the following spring is often greatly reduced. This egg mortality varies from year to year. Records obtainrd between 1940 and 1946 by the dissection and incubation of current oothecae collected at the end of March have indicated mortalities ranging from 15.6 to 86.4 per cent. Such mortality has been generally attributed to low winter temperatures although there was also evidence that eggs could be exposed to a temperature as low as−20°C without injury.

Type
Articles
Information
The Canadian Entomologist , Volume 79 , Issue 2 , February 1947 , pp. 33 - 36
Copyright
Copyright © Entomological Society of Canada 1947

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References

LITERATURE CITED

James, H. G. 1945. A note on the mortality of Mantis religiosa L. in the egg stage. Ann. Rep. Ent. Soc. Ont., 1944: 35–56. (1945)Google Scholar
Salt, R. W. 1936. Studies on the freezing process in insects. Minn. Agr. Exp. Sta. Tech. Bull. 116.Google Scholar