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POPULATION DYNAMICS OF THE CABBAGE APHID, BREVICORYNE BRASSICAE (HOMOPTERA: APHIDIDAE) AT VANCOUVER, BRITISH COLUMBIA: III. DEVELOPMENT, FECUNDITY, AND MORPH DETERMINATION VS. APHID DENSITY AND PLANT QUALITY

Published online by Cambridge University Press:  31 May 2012

D. A. Raworth ,
S. McFarlane ,
N. Gilbert  and
B. D. Frazer
D. A. Raworth
Affiliation:
Research Station, Agriculture Canada, Vancouver, British Columbia V6T 1X2
S. McFarlane
Affiliation:
3125 Waterloo Street, Vancouver, British Columbia
N. Gilbert
Affiliation:
CSIRO Division of Wildlife, Lyneham, A.C.T. 2602Australia
B. D. Frazer
Affiliation:
Research Station, Agriculture Canada, Vancouver, British Columbia V6T 1X2
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Abstract

Developmental time, fecundity, adult weight, numbers, and age distribution of Brevicoryne brassicae (L.) and leaf area and plant quality of Maris Kestrel kale, Brassica oleracea L., were determined at three aphid densities and two watering rates in a factorial field-cage experiment. The watering treatment had no effect on the aphid or plant response variates. The aphid density treatment significantly affected final aphid numbers (low < medium = high density), leaf area (high < low = medium density), average adult weight measured at the end of the experiment (high < low < medium density), and weight of the adults in the developmental time measurement (high < low = medium density). The results suggested a strong aphid–plant interaction, but at densities which rarely occur in the field. Leaf water/dry weight was used to assess plant quality, but it was not a good predictor of any of the aphid response variates. Developmental time decreased, and fecundity increased as adult aphid weight increased. Production of fourth-instar apterae decreased logarithmically as aphid density increased.

Résumé

On a déterminé le temps de développement, la fécondité, le poids des adultes, et la répartition en nombre et en âge des populations de Brevicoryne brassicae (L.) ainsi que la surface foliaire et la qualité de la variété Maris Kestrel kale, Brassica oleracea L., pour trois densités de population de pucerons et deux taux d'arrosage, dans une expérience factorielle en cage grillagée. Les taux d'arrosage n'ont pas influé sur les variables aléatoires de la réponse des pucerons et des plantes. La densité de la population de pucerons a beaucoup influé sur le nombre final de pucerons (faible < moyen = forte densité), la surface foliaire (élevée < basse = densité moyenne), le poids moyen des adultes mesuré à la fin de l'expérience (élevé < faible < densité moyenne) et le poids des adultes dans la mesure du temps de développement (élevé < faible = densité moyenne). Les résultats montrent une interaction très forte entre les pucerons et la plante mais à des densités rarement observées au champ. Par ailleurs, on a utilisé les poids sec et frais des feuilles pour évaluer la qualité de la plante, mais on s'est aperçu qu'on ne pouvait s'en servir pour prévoir les variables aléatoires de la réaction des pucerons. Le temps de développement a diminué et la fécondité a augmenté parallèlement au poids chez l'adulte. La production d'individus aptères du quatrième stade a diminué logarithmiquement au fur et à mesure que la densité de la population de pucerons augmentait.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 6 , June 1984 , pp. 879 - 888
Copyright
Copyright © Entomological Society of Canada 1984

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