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Oviposition behaviour and host colony size discrimination in Episyrphus balteatus (Diptera: Syrphidae)

Published online by Cambridge University Press:  09 March 2007

J.P. Sutherland
Affiliation:
Behavioural and Environmental Biology, Department of Biological Sciences, the Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK Department of Entomology and Nematology, IACR-Rothamsted, Harpenden, Hertfordshire, AL5 2JQ, UK
M.S. Sullivan*
Affiliation:
Behavioural and Environmental Biology, Department of Biological Sciences, the Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK
G.M. Poppy
Affiliation:
Department of Entomology and Nematology, IACR-Rothamsted, Harpenden, Hertfordshire, AL5 2JQ, UK
*
*Fax: + 44 (0)161 247 6325 E-mail: [email protected]

Abstract

Three bioassays were used to examine the oviposition behaviour of the hoverfly, Episyrphus balteatus (Degeer) in which various stimuli purported to influence host assessment and choice were tested. Episyrphus balteatus failed to exhibit enhanced behavioural responses, terms of approaches and landings, to artificial leaves with the highest numbers of aphids, suggesting that females are merely responding to the colour of the artificial leaves. A density-dependent oviposition response was reported in a second bioassay using whole bean plants, although there an asymptotic relationship. Syrphid responses, which were measured by oviposition over a five-day period, were greatest towards those plants with the highest number of aphids. In a final series of trials, gravid female E. balteatus showed a behavioural preference for filter papers with the greatest honeydew concentrations (0.26 mg μl−1 honeydew). More time was spent in the treated areas and syrphids demonstrated more proboscis and ovipositor extensions in these treatments. These bioassays provided an opportunity to isolate some of the individual of decision-making by female E. balteatus during egg-laying behaviour. A greater understanding of natural enemy behaviour is essential before enhanced control of pest populations in the field can be established.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2001

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