Larvicidal activities of hydro-ethanolic extracts of three Cameroonian medicinal plants against Aedes albopictus

Larvicidal activities of hydro-ethanolic extracts of three Cameroonian medicinal plants against Aedes albopictus

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Objective: To investigate the larvicidal activity of Syzygium guineense (Myrtaceae) (S.guineense), Monodora myristica and Zanthoxylum heitzii (Rutaceae) (Z.heitzii) extracts against Aedes albopictus (Ae.albopictus).Methods: The larvicidal activity of the hydro-ethanolic extracts from these plant species was assessed at three different concentrations (50, 100 and 200 mg/L) on first-instar of Ae.

albopictus larvae in comparison with untreated controls.Mortality rate was recorded daily for a period of 12 days.The values of LC50 and lethal time killing 50% of the tested individuals (LT50) Generation 1 were calculated using the log-probit analysis.Results: The root extract of S.guineense exhibited the best activity with 100% mortality after 8 days of treatment at 200 mg/L, followed by the fruit extract of Z.

heitzii with 83.33% mortality at the same concentration.Nonetheless, larvae were most susceptible to the fruit extract of Z.heitzii both in terms of LC50 (39.89 mg/L) and LT50 (145.

68 h).A statistically significant difference between the control and the group treated at 200 mg/L was noticed in all the extracts.Conclusions: The present study shows that the hydro-ethanolic extracts of S.guineense, Monodora myristica and Z.heitzii tested have significant larvicidal activity.

These preliminary results are of great interest and some of these plant species can be proposed for 5 Piece Outdoor Sectional with Ottoman the formulation of new bioinsecticides to control Ae.albopictus populations.