, Volume 13, Issue 1, pp 21-24

Larvicidal efficacy ofBacillus thuringiensis var. israelensis andBacillus sphaericus onAnopheles arabiensis in Ethiopia

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The second instar larvae of the malaria vector mosquito,Anopheles arabiensis,were more susceptible to Bacillus thuringiensis var. israelensis (IPS-82) and B. sphaericus (SPH-88) than the third instar larvae. The LC 50 values were 1.0 ΜgI-1 and 1.8 ΜgI-1 for IPS-82 against second and third instar larvae respectively, after 48 h of exposure. The LC50 values for SPH-88 were 3.6 Μg {siI-1} against the second instar larvae and 7.6 ΜgI-1 against the third instar larvae of An. arabiensis. The larvicidal efficacy of SPH-88 was significantly less than IPS-82. The potential of IPS-82 for the control of An. arabiensis in malaria endemic areas is promising.