In vitro and in vivo acaricidal activity and residual toxicity of spinosad to the poultry red mite, Dermanyssus gallinae

Veterinary Parasitology
David R GeorgeJonathan H Guy

Abstract

This paper describes two experiments conducted to examine the acaricidal potential of spinosad against the poultry red mite, Dermanyssus gallinae (De Geer), a serious ectoparasitic pest of laying hens. Spinosad is a natural product derived from the fermentation of the micro-organism Saccharopolyspora spinosa. In vitro testing confirmed that, when applied to a galvanised metal plate to the point of run-off, spinosad was toxic to adult female D. gallinae and suggested that at an application rate of 3.88 g/L a significant residual toxicity of spinosad could be achieved for up to 21 days. A subsequent in vivo experiment in a conventional cage housing system for laying hens demonstrated the acaricidal activity and residual toxicity to D. gallinae of a single application of spinosad when applied at either 1.94 or 3.88 g/L. Residual toxicity of spinosad at both of these application rates was maintained throughout the course of the 28 day post-spray study period, with a peak in product efficacy seen 14 days after spraying. The results suggest that the greater the D. gallinae population the greater will be the toxic effect of spinosad. Although the exact reasons for this are unclear, it can be speculated that conspecifics spread the pro...Continue Reading

References

Jan 1, 1996·Veterinary Parasitology·B Berrag, G M Urquhart
May 31, 1997·The Veterinary Record·F BeugnetL Beert
Aug 23, 2005·The Veterinary Record·M D FiddesK A Stafford
Jan 23, 2009·Experimental & Applied Acarology·Olivier SparaganoMaria Assunta Cafiero
Feb 12, 2009·Experimental & Applied Acarology·Claire Valiente MoroLionel Zenner

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Citations

Jan 9, 2014·Annual Review of Entomology·O A E SparaganoA Giangaspero
Jul 19, 2011·Parasites & Vectors·Afrim HamidiOlivier Sparagano

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