Efficacy of Enriched Melia &zedarach L. Extract on Immature Stagesof the Pest Spodoptera cilium latebrosc(Guerine) (Lepidoptera:=Noctuidae)

Abstract

The enriched methanolic extract from unripe fruits of Melia zedarach was used for diet treatment of Spodoptera cilium latebrosa. Artificial diets were treated with concentrations of 0.25, 0.5, 1.0, 5.0, 10.0 and 15.0 ppm. Starting with 3rd instar, mortality percentage were 33.3, 45.8, 75.0 and 100% at the concentrations 0.5, 1.0, 5.0 and 10.0 ppm respectively. Residual activity was high toxic during one-day-old at the higher concentrations 10.0 and 15.0 ppm. Duration of the life cycle was affected by diet treatment; larval and pupal periods were prolonged, while that of prepupa shortend. The extract lost its residual toxicity by the 8th day after treatment.