Effect of organic extracts of Cafure leaves (Eucalyptus camaldulensis Dehn.) on mosquitoes (Anopheles arabiensis Patton.)

Fathelrahman. I. Elsiddig


Laboratory experiments were conducted at the National Malaria Centre, Sinnar State, Sudan to investigate the effects of organic extracts of Cafure leaves (Eucalyptus camaledulensis Dehn.) against malaria vector in Sudan (Anopheles arabiensis) Patton (Diptera:Culicidae). The larvicidal activities of different concentrations of ethanol and hexane extracts were measured according to the WHO standards for testing susceptibility of mosquito larvae to insecticides. The effects of extracts on repellency, oviposition deterrency and mortality of adult insects were also measured. Results indicated that hexane extract showed the best larvicidal effect with LC50 of 127.9 mg ℓ-1. It proved superiority over the standard larvicide Temphos® in the initial levels, meanwhile, ethanol extract exerted poor larvicidal effect (LC50 8276 mg ℓ1). Results showed that hexane extract at 10% concentration repelled mosquitoes, for two and a half hours. However, ethanol concentrations depicted no repellency. All the tested extracts exhibited oviposition deterrency properties but had little insecticidal activities.

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