Acaricidal activity of two plant essential oils on the adult stage of the European house dust mite, Dermatophagoides pteronyssinus Trouessart (Acari: Pyroglyphidae)

Document Type : Original Article

Authors

Economic Entomology Dept. Faculty of Agriculture (Elshatby) Alexandria University, Alexandria, Egypt

10.21608/jpces.2003.459391

Abstract

The plant essential oils, thymol and eugenol, were tested for their acaricidal activity on the adult stage of the Europeqn house dust mite, Dermatophagoides pteronyssinus Trouessart (Acari: Pyroglyphidae). Five concentrations (25, 50, 100, 250 and 500 ppm) of each of the two essential plant oils were applied on 0.5 g house dust. Mortality was recorded five time intervals (5, 15, 30, 60 minutes and 12 hrs). Thymol was found to be the least effective after five minutes where the LCso was about 168.3 ppm (confidence limits at p = 0.05 ranging 122.4 — 232.7 ppm). The highest mortality was reached after on hour with LC50 as low as 19.4 ppm (11.01 — 33.6 ppm at p = 0.05). At a min interval, eugenol was found to be less effective with an LCso about 294.5.ppm (confidence limits at p = 0.05, ranging 206.1 — 422.7 ppm). The highest mortality was reached after one hour, where the LC50 was as low as 32.8 ppm (24.5 — 43.7 ppm at p = 0.05). A reduction in the LC50 values over time was noticed Ibr the two compounds. The optimum concentration for thymol was found to he 100 ppm where it reached 96 % mortality after one hr and 100 % mortality after 12 hr.. Whereas, the optimum concentration for eugenol was found to be 250 ppm where 96 % mortality after one hr and 100 % mortality after 12 hr were reached. For eugenol, the I-CSO values seem to get a little higher, indicating a less efficacy compared to thymol.

Keywords

Journal of Pest Control and Environmental Sciences
Volume 11, Issue 1
June 2003
Pages 13-37

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