An evaluation of repellency and feeding inhibition of ethno-medicinal plants against major malaria vectors in southern Ethiopia
Open Access
- 7 April 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Parasites & Vectors
- Vol. 14 (1), 1-9
- https://doi.org/10.1186/s13071-021-04694-6
Abstract
Plant-based mosquito control methods may use as a supplementary malaria vector control strategy. This study aimed to evaluate the effect of smoking ethno-medicinal plants on indoor density and feeding activity of malaria vectors at early hours of the night and its residual effect after midnight in southern Ethiopia. Both field and tent trials were conducted to evaluate the impact of smoking Juniperus procera leaves, Eucalyptus globulus seeds and Olea europaea leaves in Kolla Shara Village from July 2016 to February 2017. For the field trial, five grass-thatched traditional huts (three for ethno-medicinal plants and two as control [only charcoal smoking and non-charcoal smoking]) were used. Indoor host-seeking mosquitoes were collected by CDC light traps. A Latin square design was employed to minimize the bias due to the variation in house location and different sampling nights. For the tent experiment, 25 3–5-day-old starved wild female Anopheles mosquitoes reared from the larvae were released into the tents where a calf was tethered at the mid-point of each tent. A total of 614 Anopheles mosquitoes belonging to 5 species were collected from 5 huts, of which 93.4% was An. arabiensis; O. europaea, E. globulus and J. procera reduced the indoor density of An. arabiensis, with the mean percentage drop of 80%, 73% and 70%, respectively. In the tent trial, smoking of these plants had significant knockdown effects and inhibited feeding on the calves (F = 383.5, DF = 3, P < 0.01). The mean knockdown effect due to O. europaea was relatively high (17.7 ± 0.54; 95% CI 16.8–18.6), while it was only 0.9 ± 0.1 (95% CI 0.29–1.52) in the control tents. All the test plants used in the tent trial caused significantly inhibited feeding activity of An. arabiensis on the host (F = 383.5, DF = 3, P < 0.01). About 94.5%, 89.5% and 86% of mosquitoes were unfed because of the smoking effect of O. europaea, E. globulus and J. procera, respectively, whereas only 19.5% were unfed in the control tent. Smoking ethno-medicinal plant materials reduced indoor density of malaria vectors and inhibited feeding on calves inside the tents. Thus, plant-based mosquito control methods may play a vital role in reducing mosquito bites in the early hours of the night and thereby reduce residual malaria transmission.Keywords
Funding Information
- Norwegian Program for Capacity Development in Higher Education and Research for Development (ETH-13/0025)
This publication has 18 references indexed in Scilit:
- Entomological surveillance of behavioural resilience and resistance in residual malaria vector populationsMalaria Journal, 2013
- Blood meal origins and insecticide susceptibility of Anopheles arabiensis from Chano in South-West EthiopiaParasites & Vectors, 2013
- Insecticide resistance: a challenge to malaria vector control in EthiopiaMalaria Journal, 2012
- Fresh, dried or smoked? repellent properties of volatiles emitted from ethnomedicinal plant leaves against malaria and yellow fever vectors in EthiopiaMalaria Journal, 2011
- Early biting rhythm in the afro‐tropical vector of malaria, Anopheles arabiensis, and challenges for its control in EthiopiaMedical and Veterinary Entomology, 2011
- Field investigation on the repellent activity of some aromatic plants by traditional means against Anopheles arabiensis and An. pharoensis (Diptera: Culicidae) around Koka, central EthiopiaActa Tropica, 2009
- Smoke and malaria: are interventions to reduce exposure to indoor air pollution likely to increase exposure to mosquitoes?Transactions of the Royal Society of Tropical Medicine and Hygiene, 2007
- Repellency effect of forty-one essential oils against Aedes, Anopheles, and Culex mosquitoesZeitschrift für Parasitenkunde, 2006
- Traditional use of mosquito-repellent plants in western Kenya and their evaluation in semi-field experimental huts against Anopheles gambiae: ethnobotanical studies and application by thermal expulsion and direct burningTransactions of the Royal Society of Tropical Medicine and Hygiene, 2002
- Monitoring human-biting mosquitoes (Diptera: Culicidae) in Tanzania with light-traps hung beside mosquito netsBulletin of Entomological Research, 1991