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TEMPERATURE RELATIONS OF ADULT COLEOMEGILLA MACULATA LENGI AND C. M. MEDIALIS (COLEOPTERA:COCCINELLIDAE) AND RESPONSES TO OVIPOSITIONAL STIMULANTS

Published online by Cambridge University Press:  31 May 2012

B. C. Smith  and
R. R. Williams
B. C. Smith
Affiliation:
Research Station, Agriculture Canada, Harrow, Ontario
R. R. Williams
Affiliation:
Research Station, Agriculture Canada, Harrow, Ontario
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Abstract

An adult of either Coleomegilla maculata lengi or C. m. medialis ate about 280 mg dry Acyrthosiphon pisum in its lifetime at various constant temperatures. Total food consumption and rate of intake increased with temperature and rate did not vary with age. The average ages attained by field-collected and laboratory-reared adults were greatest at temperatures of 17° and 23 °C, respectively, for C. m. lengi and at 23 °C for C. m. medialis. Neither subspecies laid any eggs at 17 °C, C. m. lengi laid some eggs at 23 °C, and both subspecies laid the largest number of eggs at 25 °C. Fertility as percentage of eggs hatched was lower in both subspecies at 34 °C (30%) than at 23° and 25 °C (100%). Ethanol extracts of teak, cinnamon, clove, guaiacol, and resorcinol were the most effective ovipositional stimulants for C. m. lengi when formulated in water. Exposure to the ethanol extracts of different plants increased the incidence of oviposition by 19% and the number of eggs/♀/day by 36% in C. m. lengi.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 9 , September 1976 , pp. 925 - 930
Copyright
Copyright © Entomological Society of Canada 1976

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References

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