Insecticidal activity of three phytochemicals against the Egyption cotton leafworm, Spodoptera littoralis(boisd.) noctuidae : lepidoptera [electronic resource].

Includes references.

The toxic effect of three phytochemicals which isolated from three plants, Tephrosia apollinea, Ferula vesceritensis and Daucus carotaagainst the second and fourth instar larvae of the cotton leafworm ,S.littoralis The experiments were carried out in the laboratory to evaluate the molecular formula for these phytochemicals were C241-12007, C22H3004 and C24H3003, respectively. The second and fourth instar larvae were allowed to contact for 24h. with the residual film of each phytochemical at different concentrations. The third one C24H3003 was the most toxic against the second and fourth instars. The LC50 values were 56 and 100 ppm for 2nd and 4th larvae instars, respectively) , while the second compound (C22H3004) was the least toxic. The LC50 values were 108 and 480ppm against both instars. The development of the treated larvae was affected, whereas, it increase the larval and pupal period , and decrease pupation and adult emergence percentages and pupal weight . Also ,the fecundity, fertility, Longevity were decreased ,and sex ratio of the adult stage treated as 4th instar larvae with the three phytochemicals was affected. Pupal and adults malformation percentages were produced as a result of the larval treatment of 4th instar with the three phytochemicals at the LC50 values.

Summary in Arabic.

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