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Toxicity of plant essential oils to different life stages of the poultry red mite, Dermanyssus gallinae, and non-target invertebrates

Lookup NU author(s): David George, Dr Olivier Sparagano, Dr Gordon Port, Dr Ed Okello, Dr Robert Shiel, Dr Jonathan Guy


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Seven essential oils with potential as acaricides for use against the poultry red mite, Dermanyssus gallinae (De Geer) (Acari: Dermanyssidae), were selected for study. These products (essential oils of manuka, cade, pennyroyal, thyme, garlic, clove bud and cinnamon bark) were deployed against different life stages of D. gallinae in laboratory tests at the (lethal concentration) LC50 level for adult mites. For all essential oils tested, toxicity to D. gallinae juveniles was as high as toxicity to adults, if not higher. However, at the LC50 level determined for adults, some oils were ineffective in preventing hatching of D. gallinae eggs. The essential oils were also tested under laboratory conditions at their LC90 levels for D. gallinae adults on two model non-target species, the brine shrimp, Artemia salina (L.), and the mealworm beetle, Tenebrio molitor (L.). Results showed that not all essential oils were as toxic to A. salina and T. molitor as they were to D. gallinae, suggesting that it may be possible to select certain oils for development as acaricides against D. gallinae that would have minimal impact on non-target organisms. However, the level of toxicity to A. salina and T. molitor was not consistent across the selected essential oils.

Publication metadata

Author(s): George DR, Sparagano OAE, Port G, Okello E, Shiel RS, Guy JH

Publication type: Article

Publication status: Published

Journal: Medical and Veterinary Entomology

Year: 2010

Volume: 24

Issue: 1

Pages: 9-15

Print publication date: 12/02/2010

ISSN (print): 0269-283X

ISSN (electronic): 1365-2915

Publisher: Wiley-Blackwell Publishing Ltd.


DOI: 10.1111/j.1365-2915.2009.00856.x


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