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DISTRIBUTION PATTERN OF HOSTS AND PARASITIZATION BY SPALANGIA DROSOPHILAE (HYMENOPTERA: PTEROMALIDAE)1

Published online by Cambridge University Press:  31 May 2012

E. F. Legner
E. F. Legner
Affiliation:
Department of Biological Control, University of California Citrus Research Center and Agricultural Experiment Station, Riverside
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Abstract

Single females of Spalangia drosophilae Ashmead searching for 80 puparia of Hippelates collusor (Townsend), arranged in clumped or linear distributions, oviposited randomly producing equal numbers of progeny from cither host arrangement. Mixed groups of linear and clumped puparia caused changes in behavioral patterns that resulted in reduced progeny production, thus showing parasitization to be nonrandom. Host destruction was, nevertheless, greater in an all-clumped distribution, tile greater acceptance of clumped groups resulting in a greater number of progeny. Mixed groups involving a choice between linear or clumped distributions demonstrated the greater acceptance of clumped groups. Direct observation showed that the all-dumped distribution elicited the greatest overall initial attraction for hosts and subsequent movement to other areas. It was concluded that maximum host destruction resulted when completely random behavior was involved. A recognition of this, however, required a knowledge of behavior, host condition, and progeny production. The question of evaluating an exotic parasite’s effectiveness before introduction is discussed.

Type
Articles
Information
The Canadian Entomologist , Volume 101 , Issue 5 , May 1969 , pp. 551 - 557
Copyright
Copyright © Entomological Society of Canada 1969

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References

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