Repellent activity of essential oils against cockroaches (Dictyoptera: Blattidae, Blattellidae, and Blaberidae) in Thailand. Southeast Asian J Trop Med Public Health

National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Nonthaburi, Thailand.
The Southeast Asian journal of tropical medicine and public health (Impact Factor: 0.72). 08/2007; 38(4):663-73.
Source: PubMed

ABSTRACT Seven commercial essential oils extracted from the plant species Boesenbergia rotunda (L.) Mansf., Citrus hystrix DC., Curcuma longa L., Litsea cubeba (Lour.) Pers., Piper nigrum L., Psidium guajava L. and Zingiber officinale Roscoe, and naphthalene as a control, were evaluated for repellent activity against the three cockroach species Periplaneta americana (L.), Blattella germanica (L.) and Neostylopyga rhombifolia (Stoll) under laboratory conditions. The essential oil derived from Citrus hystrix showed the best repellency over other candidate essential oils and naphthalene. The essential oil of Citrus hystrix exhibited complete repellency (100%) against P. americana and B. germanica, and also showed the highest repellency (among the essential oils tested) of about 87.5% against N. rhombifolia under laboratory conditions. In the field, Citrus hystrix essential oil formulated as a 20% active ingredient in ethanol and some additives provided satisfactory repellency of up to 86% reduction in cockroaches, mostly P. americana and N. rhombifolia with a residual effect lasting a week after treatment. Citrus hystrix essential oil has good potential for being used as a cockroach repellent. Further improvements in efficacy and residual activity may be realized with appropriate formulations.

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    • "development of resistance in cockroaches, as well as the hazardous effects on human health and the negative effects on the environment has limited the use of these chemicals. Therefore, intensive efforts are being put to find alternative environmentally friendly compounds such as plant-based repellents (Ngoh et al., 1998; Thavara et al., 2007; Yoon et al., 2009). Up to now, no study has been reported on the evaluation of plant-based repellents against cockroaches in Turkey. "
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    • "Recently, the essential oil of catrip (Nepeta cataria L.) was reported to have repellency against adult male B. germanica (L.). Thava et al. (2007) studied seven commercial essential oils for repellency against cockroaches and found Citrus hystix exhibited complete repellency against P. americana and B. germanica. "
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