ENHANCING ACTIVITY OF FIVE PLANT ESSENTIAL OILS ON PYRETHRIN AEROSOL INSECTICIDE

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ENHANCING ACTIVITY OF FIVE PLANT ESSENTIAL OILS ON PYRETHRIN AEROSOL INSECTICIDE

Journal Title: Acta Parasitologica et Medica Entomologica Sinica - Year 2024, Vol 31, Issue 4

Abstract

[Objective] This study aims to provide further clarification regarding the activity enhancement effects of peppermint oil, eucalyptus oil, Litsea cubeba oil, patchouli oil, and lemon oil on pyrethrin aerosol insecticide, and to establish a theoretical basis for the development of this insecticide. [Methods] The common mosquito Culex pipiens pallens was employed as the test insect. The fumigant effect of five essential oils on Cx. pipiens pallens was determined by the closed cylindrical fumigation method. Based on the 5.8 m3 room method, the oils exhibiting discernible activity enhancement were combined by multiple combinations. In addition, the optimal combination was selected and formulated into a finished aerosol insecticide. This was then subjected to a comparison of indoor efficacy and a simulated field test of commercially available products. [Results] The closed cylindrical fumigation method demonstrated the efficacy of various essential oils, including Litsea cubeba oil, lemon oil, peppermint oil, eucalyptus oil, and patchouli oil, against Cx. pipiens pallens. The KT50 values for these oils were all within 25 min, indicating their potential for rapid biological activity. The combinations that exhibited superior enhancement effects when utilizing the 5.8 m3 room method were as follows: The following combinations were identified as having the most promising enhancement effects: P-A (10.0% Litsea cubeba oil + 1.0% pyrethrin), P-B (10.0% eucalyptus oil + 1.0% pyrethrin), P-G (6.0% eucalyptus oil + 10% Litsea cubeba oil + 1.0% pyrethrin); and P-G exhibited the highest enhancement coefficient (1.3646), followed by P-B (1.211 2) and P-A (1.175 4). The P-G formula was selected for the production of the aerosol, and the 5.8 m3 cabin method was used for the indoor efficacy test. The simulated field test was carried out using the 28 m3 simulated field method. In determining the indoor efficacy of the formulation, P-G, the KT50 was found to be 2.775 2 min, with a 24-hour mortality rate of 98.67%. In the simulated field trials, the KT50 of the aerosol formulation, P-G, was determined to be 11.680 0 min, with a 24-hour mortality rate of 73%. [Conclusions] The pyrethrin aerosol insecticide enhancement formulation P-G, which has been obtained in this study, produces an evident enhancement effect and thus represents a promising candidate for industrial development.

Authors and Affiliations

Jie ZHANG, Xiao-e WANG

Keywords

EP ID EP759145
DOI 10.3969/j.issn.1005-0507.2024.04.004
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