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Abstract
Laboratory studies were carried out in an order to disclose the effect of antifeedant (Neem) and IGRs (cascade) and their mixture at different concentrations on one day old the 5 {u036D} {u036A} nymphal instar of the desert locust schistocerca gregaria (forskal) by feeding technique .Results are clear that neem sole caused 42% mortality while cascade 39% mortality 12 days after treatment of LC₂₅ values. The toxicity factor of mixtures of Neem and Cascade at LC₂₅ values at days 5 to 12 post treatment were additive effect at all observations