Insecticidal properties of some plant extracts against granary weevil, sitophilus granaries l. And rust-red flour beetle, tribolium castaneum h.

الملخص EN

Laboratory experiments were conducted under controlled conditions to test the insecticidal activity of aqueous and organic extracts of eight plants collected from north-Sinai (Tree tobacco, Nicotiana glauca G.

; Lavender cotton, Achilles fragrantissima F.

; Thyme lea lea Thymelaea hirsute L.

; Rimth, Hammad elegans L., Yarnow, Achilles semolina L., Chinaberry, Melia azedarach L., Olive, Olea europaea L.

and Lemon, Citrus limon L.

against the adult stages of Granary weevil, Sitophilus granaries L.

and the Rust – red flour beetle, Tribalism castaneum H.

The results showed that the aqueous extract of T.

hirsute gave the highest toxicity among the other tested plants against the Granary weevil, S.

granaries with LD50 equal to 0.25 x 10-3 ppm.

However, the organic extract of N.

glauca showed the best results with LD50 equal to 0.833 x 10-3 ppm on S.

granaries.

On the other hand, both the aqueous and organic extracts of A.

santolina gave the highest toxicity against T.

castaneum with LD50's of 0.105 x 105 and 0.085 x 105 ppm, respectively.