Laboratory experiment was conducted under controlled conditions to test the insecticidal activity of
aqueous and organic extract of different solvents 􀀫ethanol, acetone and hexane􀀬 of three plants collected from north-
Sinai 􀀫Tree tobacco, Nicotiana glauca G.; Chinaberry, Melia azedarach L. and Lemon, Citrus limon L.􀀬 against the
adult stage of Granary Weevil, Sitophilus granarius L. The results showed that the aqueous extract of C. limon gave the
highest toxicity among the other tested plants with LD5􀀜 equal to 􀀜.􀀜􀀜􀀝3 x 􀀝􀀜5 ppm using ethanol solvent. However,
the organic extracts of M. azedarach L. showed the best result with LD5􀀜 equal to 􀀜.􀀜􀀜􀀜56 x 􀀝􀀜5 ppm. On the other
hand, both the aqueous and organic extracts of N. glauca gave the highest toxicity with LD5􀀜's of 􀀜.􀀜􀀜56 x 􀀝􀀜5 ppm and
􀀜.􀀜􀀜􀀜86 x 􀀝􀀜5 ppm, respectively, with acetone solvent. But by using hexane solvent, aqueous extract of N. glauca was
obviously the most superior in toxicity compared to the aqueous extracts of the tested plants with LD5􀀜 􀀫􀀜.􀀜􀀜􀀝7 x 􀀝􀀜5
ppm􀀬 and in the organic phase M. azedarach had the best result with LD5􀀜 equal to 􀀜.􀀜􀀜􀀜􀀝7 x 􀀝􀀜5 ppm .