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This study investigated composition and toxicity of Thyme EOs against two main stored grain insect pests. Carvacrol was distinguished as a major compound (78.34%). In laboratory tests, EOs applied by both direct contact and fumigant tests was more toxic to  L. serricorne  than  T. castaneum . The EOs were also tested combined with two Tunisian Diatomaceous earths (DEs) against  T. castaneum . The LC 50  was 6.28 µL/L air for natural preparation EO/R1, 5.90 µL/L air for EO/R2 and 121.17 for crude EOs by fumigant test, respectively. While, contact test revealed that natural DEs; dust act as an insecticide with ‘LC 50 ʻ values of 3.22 and 0.29 µL/cm 2 f or R1 and R2, respectively. Moreover, a significant difference was noted between crude EO, EO/R1 and EO/R2. Overall, the enhancement of the Tunisian DEs’ insecticidal activity by its mix with EOs may be a promising active substance as a stored grain protectant.

international journal of environmental health research

Insecticidal effects of two Tunisian diatomaceous earth loaded with  Thymus capitatus  (L.) Hoffmans and Links as an ecofriendly approach for stored coleopteran pest control