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POPULATION DYNAMICS OF THE CABBAGE APHID, BREVICORYNE BRASSICAE (HOMOPTERA: APHIDIDAE) AT VANCOUVER, BRITISH COLUMBIA: V. A SIMULATION MODEL

Published online by Cambridge University Press:  31 May 2012

D. A. Raworth
D. A. Raworth
Affiliation:
Research Station, Agriculture Canada, Vancouver, British Columbia V6T 1X2
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Abstract

A computer model was written to simulate the population dynamics of the cabbage aphid, Brevicoryne brassicae (L.), on the host Maris Kestrel kale, Brassica oleracea L., at Vancouver, British Columbia. The model incorporated the effects of temperature, morph determination, plant quality, predators, parasites, and leaf fall. Comparisons of simulated results with field observations indicated that although B. brassicae, Aphidoletes aphidimyza (Rond.), and Diaeretiella rapae (M'Intosh) were reasonably well understood, syrphid predation was not, and appropriate feed-back mechanisms which could prevent monotonic increase or decrease in the simulated population were lacking. A detailed study in which the population dynamics of the prey is accounted for in terms of the numerical and functional responses of syrphid predators is necessary to understand the population dynamics of B. brassicae on Maris Kestrel kale at Vancouver. Comparisons with other aphid systems suggest that a major change in one component of the system can be compensated for by changes in other components. An overview of the cabbage aphid system at Vancouver is given.

Résumé

Nous avons écrit un modèle informatique pour simuler la dynamique de la population de pucerons du chou, Brevicoryne brassicae (L.), sur le chou fourrager hôte Maris Kestrel, Brassica oleracea L., à Vancouver (Colombie-Britannique). Le modèle tenait compte des effets la température, de la détermination du morpha, de la qualité de la plante, des prédateurs, des parasites et de la chute des feuilles. En comparant les résultats simulés avec les observations sur le terrain, nous avons constaté que malgré une compréhension raisonnablement bonne de l'action de B. brassicae, d'Aphidoletes aphidimyza (Rond.) et de Diaeretiella rapae (M'Intosh), celle de la prédation des syrphidés laissait à désirer et qu'il manquait un mécanisme approprié de rétroaction capable d'empêcher l'augmentation ou la diminution monotones de la population simulée. Pour comprendre la dynamique de la population de B. brassicae sur le chou fourrager Maris-Kestrel à Vancouver, il faudrait une étude détaillée qui tiendrait compte de la dynamique de la population exprimée en fonction des réponses numériques et fonctionnelles des syrphidés prédateurs. La comparaison avec d'autres ensembles de pucerons laisse entendre qu'un changement majeur dans une composante de l'ensemble peut être compensé par le changement d'autres composantes. Un aperçu général du système des pucerons du chou à Vancouver est donné.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 6 , June 1984 , pp. 895 - 911
Copyright
Copyright © Entomological Society of Canada 1984

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