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ANALYSIS OF MORTALITY IN THE APPLE MAGGOT, RHAGOLETIS POMONELLA (DIPTERA: TEPHRITIDAE), IN QUEBEC

Published online by Cambridge University Press:  31 May 2012

P. J. Cameron  and
F. O. Morrison
P. J. Cameron
Affiliation:
Department of Entomology, Macdonald College of McGill University, Ste. Anne de Bellevue, Quebec
F. O. Morrison
Affiliation:
Department of Entomology, Macdonald College of McGill University, Ste. Anne de Bellevue, Quebec
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Abstract

Life tables were constructed for populations of R. pomonella (Walsh) in two abandoned, heavily infested apple orchards near Como, Quebec. All life stages were sampled and the results expressed in terms of the apple as a unit. Twenty-five life tables, each based on one tree, covered two successive generations on both early and late maturing varieties.

Natality was of no value in predicting variation in numbers of emerging adults, whereas the early pupal stage estimates explained over 80% of the variation. Parasitism of larvae and pupae was more common than previously recorded but parasites were not significant in the population dynamics of their host. Nutritionally based larval mortality, predation on mature larvae and pupae, and movements of adults between trees were key factors in population variation. Early variety trees appeared to maintain apple maggot population levels. These results were supported by experimental studies on the effects of temperature treatments and predation on larval and pupal mortality.

Type
Articles
Information
The Canadian Entomologist , Volume 109 , Issue 6 , June 1977 , pp. 769 - 788
Copyright
Copyright © Entomological Society of Canada 1977

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