Ovicidal and Ovipositional Deterrent Botanicals against Leucinodes orbonalis Guenee (Pyraustidae : Lepidoptera)

Laboratory experiments were carried out inorder to test the oviposition deterrency and ovicidal action of certain wild Solanum spp., kernels of Azadirachta indica and dried powder of Acorus calamus against Leucinodes orbonalis females and its eggs. Maximum oviposition deterrency is expressed in the form of minimum oviposition index (OI). At highest concentration of 5 per cent as aqueous extract, NSKE + A. calamus was found to have minimum oviposition index of 0.22, indicating the strong oviposition deterrent effect. Considering wild Solanum spp, S. mauritianum exhibited strong deterrency only at 5 % concentration. Methanol extracts of NSKE + A. calamus as observed in the aqueous extract showed maximum oviposition deterrency with the least OI (0.14). Among wild Solanum spp., the strong deterrancy was exhibited by 0.2 per cent methanol extract of S. viarum and S. lasiocarpum. Hence, organic solvents of various tested botanicals exhibited more deterrency effect than the aqueous extract. The maximum ovicidal action (62.60%) was achieved with NSKE +A. calamus combination while the minimum was by S. trilobatum (25.61%).