Keeping Leeches at Bay: Field Evaluation of Plant-Derived Extracts against Terrestrial Blood-Sucking Leeches (Haemadipsidae) in Lao PDR
2011 (English)In: Acta Tropica, ISSN 0001-706X, E-ISSN 1873-6254, Vol. 119, no 2-3, 178-182 p.Article in journal (Refereed) Published
Terrestrial blood-sucking leeches (Haemadipsidae) are common in the damp forests of the subtropicaland tropical Indo-Pacific region. Members of the genus Haemadipsa are abundant in Laos and adjacentcountries of Southeast Asia, and discomfort to people and livestock. Plant-derived repellents againstarthropods and leeches are common in Lao PDR, and have been used by Lao ethnic groups for generations.Numerous studies have been conducted on the efficacy of traditional plant-derived repellents againstmosquitoes but only a few on repellents against terrestrial blood-sucking leeches. Field experimentswere conducted to evaluate the leech repellent activities of aqueous extracts of three traditionally usedplant species, Sapindus rarak DC., Catunaregam spathulifolia Tirv. and Vernonia elaeagnifolia DC. Stockingsimpregnated with aqueous extracts exhibited moderate to high leech repellent activity, C. spathulifolia(62.6%), V. elaeagnifolia (63.0%), and S. rarak (82.6%). The corresponding repellencies of deltamethrin andDEET were 73.1% and 88.4%, respectively. An aqueous extract of S. rarak applied on cloth at a concentrationof 1.9 mg/cm2 is an effective and practical prevention method significantly reducing the number of bloodfeedingleeches recorded on stockings worn by humans. This plant species is common in Southeast Asiaand can be obtained at limited or no cost.
Place, publisher, year, edition, pages
2011. Vol. 119, no 2-3, 178-182 p.
Plant repellents, Leeches, Traditional Knowledge, Parasites
IdentifiersURN: urn:nbn:se:uu:diva-149973DOI: 10.1016/j.actatropica.2011.05.014ISI: 000293717200018OAI: oai:DiVA.org:uu-149973DiVA: diva2:406107