Annals of Applied Biology (2004) 145, 139-144

M.A. Legrand, H. Colinet, P. Vernon and T. Hance (2004)
Autumn, winter and spring dynamics of aphid Sitobion avenae and parasitoid Aphidius rhopalosiphi interactions
Annals of Applied Biology 145 (2), 139-144
Abstract: The potential of parasitoids for aphid control during summer has been well documented. Few results are available on the impact of parasitoid populations on aphid hosts during autumn and winter and on the dynamics of their interactions during this period. The population development of Sitobion avenae, in Belgium, is analysed, from October to April, in the presence and absence of the parasitoid Aphidius rhopalosiphi. In the presence of parasitoids in winter, aphid populations decreased markedly and remained low at the beginning of spring. Induction of winter diapause in A. rhopalosiphi was observed during November at a mean temperature of 6.3°C and a decreasing photoperiod from 9.5-8.5 h of day light. A large range of A. rhopalosiphi mummy colourations, between dark and light, was noticed. This range of colouration did not allow a clear-cut distinction between diapausing and non-diapausing individuals of A. rhopalosiphi. The influence of seasonal weather and particularly temperature conditions on parasitoid mortality, strategy for overwintering and aphid population dynamics are discussed.
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Link to article at publishers website
Database assignments for author(s): Hervé Colinet, Thierry Hance

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
population dynamics/ epidemiology
Research topic(s) for beneficials or antagonists:
population dynamics/epizootiology
environment/habitat manipulation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Sitobion avenae		Belgium
Aphidius rhopalosiphi (parasitoid)	Sitobion avenae		Belgium