Laboratory evaluation of the impact of conidial Metarhizium anisopliae on developing larvae of the dengue vector Aedes albopictus

Salah S. Gurbel, Ahmed. Abu Hassan, Latiffah  Zakaria,  Hamdan Ahmad, Hamady Dieng

School of Biological Sciences, University Sains Malaysia, 11800 USM, Penang, Malaysia. Email: gurbelss@yahoo.com

Abstract

Chemical insecticide-based mosquito control has been undertaken for decades, but success has been severely affected by resistance and the associated reduction of the spectrum of efficient insecticides. This has given the impetus to search for new alternative strategies with less environmental adversities. In line of this, here we investigated the impact of an entomopathogenic fungus on a vector of dengue, an increasing public health threat, worldwide.Evaluate the efficacy of green muscles conidia of Metarhizium anisopliae to inhibit the growth or killing larvae stage of Aedes albopictus .Two types of conidia from Metarhizium anisopliae (dry and wet forms) at different concentrations were evaluated for their insecticidal effects Aedes albopictus larvae. There was a close association between conidial concentration and larval death. Larval mortality was high and low when the concentration of conidia suspension was 15x 106 and 1 x 106, respectively. Infected larvae were unable to develop to the next stage, a situation also observed in larvae treated with insect growth regulator (IGR). The rate of the larval mortality was much higher among starved larvae. However, the form of the conidia did not affect mortality pattern.

Keywords: mosquito control, entomopathogenic, Aedes albopictus, Metarhizium anisopliae, Metarhizium anisopliae

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