The toxic fumigant activity of Thymus syriacus essential oil against the greater wax moth Galleria mellonella

Authors:

Ghaleb Tayoub, Iyad Ghanem, Halah Ismail

 

Volume 29, Issue 4;
Pages: 280-287; 2023
ISSN: 2069-0053 (print), Agroprint;
ISSN (online): 2068-9551

Abstract:

The present study aims to assess the insecticidal activity of Thymus syriacus essential oil against early third larvae and adults of the greater wax moth Galleria mellonella L. Also to test the insecticidal activity of thymol against the insect third larval stage. T. syriacus essential oil was extracted by a Clevenger-like distillation system. The effect of essential oil vapor was tested on larvae and adults of G. mellonella. Various concentrations of the essential oil were tested for various incubation times. To estimate the significance of differences between treatments (P<0.05) mortality percentage values were compared using ANOVA. LC50 of the essential oil was estimated using Probit analysis. The results showed that the vapor of the Syrian thyme essential oil has toxic fumigation activity against the two tested life stages of G. mellonella in varying degrees. Mortalities varied according to the concentration and exposure time. Adults were more sensitive than the larvae. Treatment of wax combs with thymol protected the combs from infestation with third larval stage of G. mellonella. The present work showed that the vapor of T. syriacus essential oil and thymol showed insecticidal activities against the greater wax moth G. mellonella.

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