Two different experiments were conducted to evaluate the toxicity of soil fertilizers: Ammonium sulfate, potassium sulfate and super phosphate and two inorganic salts: ammonium oxalate and potassium bromate against larval and pupal stages of cotton leafworm, Spodoptera Attoralis (Boisd.) infested cotton plants. Obtained results of dilution and spraying the tested material at 2.0, 1.0 and 0.5% on cotton plants against larval stage indicated that all material showed low initial toxic effect but they proved latent effect since the death of larval stage increased as time after treatment with continuous feeding. Potassium bromate showed the highest effect followed by potassium oxalate and super phosphate since they gave the lowest percent of resulted pupae. On the other hand, super phosphate was the highest toxic material against pupal stage (63.3 mortality %) followed by potassium bromate (56.1 mortality %), potassium sulfate and ammonium oxalate while ammonium sulfate showed the least toxic effect. Results indicated that all treatments cause reduction in both fecundity and fertility. Potassium bromate was the most effective material for reducing the number of eggs deposited /female followed by super phosphate and potassium sulfate compared with untreated one.