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FACTORS AFFECTING THE MORTALITY OF LEAFMINERS ARGYRESTHIA THUIELLA AND PULICALVARIA THUJAELLA (LEPIDOPTERA: YPONOMEUTIDAE AND GELECHIIDAE) ON EASTERN WHITE CEDAR, IN ONTARIO

Published online by Cambridge University Press:  31 May 2012

N. L. Bazinet  and
M. K. Sears
N. L. Bazinet
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario N1G 2W1
M. K. Sears
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario N1G 2W1
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Abstract

Mortality factors affecting populations of the leafminers Argyresthia thuiella (Pack.) and Pulicalvaria thujaella (Kft.), on eastern white cedar in the area of Guelph, Ontario were identified and summarized in life tables. During the two annual generations studied from 1975 to 1977, overwintering mortality varied widely. Winterkill increased from 6.8% to 62.9% for A. thuiella and from 8.1% to 54.6% for P. thujaella, from 1976 to 1977. Several parasitoids produced substantial mortality of each host species, but their effect may have been superseded by winterkill in 1977. Data indicate that both populations of leafminers increased from 1975 to 1976 but decreased substantially from 1976 to 1977.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 11 , November 1979 , pp. 1299 - 1306
Copyright
Copyright © Entomological Society of Canada 1979

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References

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