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

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 we...

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Published in:International journal of environmental health research 2023-04, Vol.33 (4), p.398-412
Main Authors: Bachrouch, Olfa, Nefzi, Houwaida, Belloumi, Souhir, Horchani-Naifer, Karima, Sriti Eljazi, Jazia, Haoual Hamdi, Soumaya, Msaada, Kamel, Labidi, Jalel, Abderrabba, Manef, Mediouni Ben Jemaa, Jouda
Format: Article
Language:English
Subjects:
Animals
Carvacrol
Coleoptera
Contact
Diatomaceous earth
Diatomaceous Earth - pharmacology
essential oil
Grain storage
insecticidal activity
Insecticides
Insecticides - pharmacology
Insects
Laboratory tests
Oils, Volatile - pharmacology
Pest Control
Pests
Stored product beetle
Thymus capitatus Hoff
Toxicity
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Summary: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.
ISSN:0960-3123
1369-1619
DOI:10.1080/09603123.2022.2032614