THE EFFECT OF NON-TRADITIONAL COMPOUNDS ON SOME BIOLOGICAL ASPECTS OF THE COTTON LEAF WORM, Spodopteralittoralis UNDER LABORATORY CONDITIONS

Abstract

: The effect of sublethal concentration of tested compounds on some biological aspects of the cotton leaf worm, Spodoptera littoralis under laboratory were evaluated. There were significant differences between tested compounds, Chlorpyrifos, alpha cypermethrin, spinosad, B. thuringiensis and orange oil and control in the larval duration period of the second and fourth instar larvae of cotton leaf worm, Spodoptera littoralis . As for, larval mortality, chlorpyrifos was the most toxic compound on second and fourth instar larvae of S. littoralis , recording 53.33 and 50.0%, respectively. There were significant differences between tested compounds and control on pre- pupal period, Pupal Pupation% and Pupal weight (g) of second and fourth instar larvae of cotton leaf worm, Spodoptera littoralis . Chlorpyrifos recording the highest Pupal duration 15.00 and 12 day compared with other tested compounds and control on second and fourth instar larvae of cotton leaf worm, S. littoralis . There were significant differences between tested compounds and control on adult emergence (%), sex ratio and male longevity in second and fourth instar larvae of cotton leaf worm, S. littoralis . On the other hand, there were significant differences between tested compound and control except Alpha Cypermethrin and Orange oil in second instar larvae of S. littoralis and Chlorpyrifos and B. thuringiensis in fourth instar larvae of S. littoralis . As for number of eggs/female, fertility, hatchability (%) and deformation (%), Chlorpyrifos recorded the best results in these items.