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MAJOR FACTORS IN SURVIVAL OF THE IMMATURE STAGES OF HYLEMYA BRASSICAE (DIPTERA: ANTHOMYIIDAE) ON CABBAGE1

Published online by Cambridge University Press:  31 May 2012

M. K. Mukerji
M. K. Mukerji
Affiliation:
Ottawa Research Station, Canada Department of Agriculture, Ottawa
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Abstract

Studies on the population dynamics of the cabbage maggot, Hylemya brassicae (Bouché), on cabbage were carried out at two locations in Ontario from 1967 to 1970. Analysis of life-table data for nine generations showed that extensive mortalities occurred during the following age intervals: (1) egg stage; (2) between hatching and the second moult; (3) third-instar larvae; (4) pupal stage. Density dependent mortality occurred only during the latter period. The analysis of age interval survivals and graphical key factor analysis showed that "misadventure" of the larvae between hatching and the second moult was the key factor. The overall mortality process from egg to adult eclosion was density dependent, revealing the importance of pupal parasitism as a stabilizing factor. A predictive model based on density relationships was found to explain 62% of the variance in generation survival. The remainder of the variance is unexplained and may be due to sampling error and/or the influence of factors not measured.

Type
Articles
Information
The Canadian Entomologist , Volume 103 , Issue 5 , May 1971 , pp. 717 - 728
Copyright
Copyright © Entomological Society of Canada 1971

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