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THE PHENOLOGY AND DISTRIBUTION OF APHIDS IN CALIFORNIA ALFALFA AS MODIFIED BY LADYBIRD BEETLE PREDATION (COLEOPTERA: COCCINELLIDAE)1

Published online by Cambridge University Press:  31 May 2012

A. P. Gutierrez ,
C. G. Summers  and
J. Baumgaertner
A. P. Gutierrez
Affiliation:
Division of Biological Control, Department of Entomological Sciences, University of California, Berkeley 94720
C. G. Summers
Affiliation:
Division of Entomology and Parasitology, Department of Entomological Sciences, University of California, Berkeley 94720
J. Baumgaertner
Affiliation:
Entomologisches Institut ETH, CH—8000 Zurich, Switzerland
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Abstract

The phenologies and distributions of pea aphid (Acyrthosiphon pisum (Harris)), blue alfalfa aphid (A. kondoi (Shinji)), and spotted alfalfa aphid (Therioaphis maculata (Buckton)) were intensively studied in California alfalfa. The results showed, as expected, that aphid populations across all densities were aggregated; but that ladybird beetle (Hippodamia convergens (G.-M.)) predation increased the degree of aggregation. The distribution parameters of the aphids were estimated using methods developed by Iwao and Kuno (1971).

Résumé

Les phénologies et distributions du puceron du pois, Acyrthosiphon pisum (Harris), A. kondoi (Shinji), et Therioaphis maculata (Buckton) ont été étudiées intensivement sur la luzerne en Californie. Les résultats ont montré, tel qu’attendu, que les populations de pucerons forment des agrégats à toutes les densités; et que la prédation par la coccinelle Hippodamia convergens (G.-M.) augmente le degré d’agrégation des pucerons. Les paramètres décrivant la distribution des pucerons ont été estimés grâce à des méthodes mises au point par Iwao et Kuno (1971).

Type
Articles
Information
The Canadian Entomologist , Volume 112 , Issue 5 , 01 May 1980 , pp. 489 - 495
Copyright
Copyright © Entomological Society of Canada 1980

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References

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