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Sublethal concentrations of azadirachtin affect food intake, conversion efficiency and feeding behaviour of Spodoptera littoralis (Lepidoptera: Noctuidae)

Published online by Cambridge University Press:  09 March 2007

S.S. Martinez  and
H.F. van Emden
S.S. Martinez
Affiliation:
School of Plant Sciences, The University of Reading, Whiteknights, Reading RG6 6AS, UK
H.F. van Emden*
Affiliation:
School of Plant Sciences, The University of Reading, Whiteknights, Reading RG6 6AS, UK
*
*Fax: 0118 9750 630 E-mail: h.f.vanemden@reading.ac.uk
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Abstract

Sublethal concentrations of azadirachtin incorporated into artificial diet and offered to third-instar larvae of Spodoptera littoralis (Boisduval) prolonged larval instars and reduced food intake. These effects were observed after the treated larvae had been transferred to plain diet; the reduced food intake was therefore a secondary antifeedant effect. Azadirachtin did not influence digestion efficiency but diminished the ability of the larvae to convert both ingested and digested nutrients into growth, particularly immediately after treatment. This effect declined with time once the treatment with azadirachtin had ceased. Growth was more severely reduced than food intake, and the reduction in growth also occurred during periods when food intake was not affected, possibly due to post-ingestive effects.

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Type
Review Article
Information
Bulletin of Entomological Research , Volume 89 , Issue 1 , January 1999 , pp. 65 - 71
Copyright
Copyright © Cambridge University Press 1999

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