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SPATIAL PATTERN OF THE IMMATURE STAGES OF HYLEMYA BRASSICAE ON CABBAGE

Published online by Cambridge University Press:  31 May 2012

M. K. Mukerji  and
D. G. Harcourt
M. K. Mukerji
Affiliation:
Entomology Research Institute, Canada Department of Agriculture, Ottawa
D. G. Harcourt
Affiliation:
Entomology Research Institute, Canada Department of Agriculture, Ottawa
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Abstract

Counts of the cabbage maggot, Hylemya brassicae (Bouché), on cabbage did not conform to the Poisson distribution, there being an excess of uninfested and highly infested plants over the expected number. But when the negative binomial series was fitted to the observed distribution, the discrepancies were not significant when tested by chi-square. The negative binomial parameter k tended to increase with density. Using a common k, the distribution of the various stages may be described by expansion of (q − p)−k, when values of k are as follows: egg 0.78, larva 0.71, pupa 0.84. Three different transformations are offered for stabilizing the variance of field counts.

Type
Articles
Information
The Canadian Entomologist , Volume 102 , Issue 10 , October 1970 , pp. 1216 - 1222
Copyright
Copyright © Entomological Society of Canada 1970

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