Helicoverpa armigera Hübner and Spodoptera litura Fabricius (Lepidoptera: Noctuidae) are destructive pests of agricultural and horticultural crops. Excessive use of synthetic chemicals has created harmful impacts on non-target organisms and environment. This study was aimed to assess the insecticidal potential of acetone extracts of 40 indigenous plant species of Soon valley (Khushab, Punjab, Pakistan) against the 3rd instar larvae of H. armigera and S. litura using leaf-dip bioassay method. Results revealed that maximum mortality of H. armigera larvae was caused by the extracts of Dodonaea viscosa L. (88%), Olea ferruginea Wall. ex Aitch. (69%), Mentha longifolia (L.) Huds. (57%) and Salvia officinalis L. (52.22%), while the extracts of S. officinalis, D. viscosa, O. ferruginea, Sonchus asper (L.) Hill and Nerium indicum Mill. caused significant mortality (i.e. 70 to 90%) of S. litura larvae and exhibited minimum LC50 and LT50 values. These results propose the potential efficiency of indigenous flora against lepidopterous pests and there is a need of further biochemical characterization of these plant extracts.
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