Decoction of six medicinal plants Azadirachta indica Linn. (Meliaceae), Embelia ribes Burm. (Euphorbiaceae), Acorus calamus Linn. (Araceae), Solanum nigrum Linn. (Solanaceae), Ocimum sanctum Linn. (Labiatae), Pongamia glabra Vent. (Leguminosae), were studied for their insecticidal effects on the potato plant (Solanum tuberosum Linn; Family: Solanaceae) insect pests aphids, white grub and wireworm. Potato plants were planted on 5 × 5 ft. area and experimental plot was divided into 9 squares. Aqueous decoction of each plant was prepared and sprayed on plants over a period of 8 weeks. All the aqueous decoction of plants was more effective against potato aphids as compared to sub- soil pest; wireworm and white grub. Out of six plants, decoction of Azadirachta indica and Ocimum sanctum shows significant insecticidal activity against potato pests. These naturally occurring plant decoctions could be useful for managing populations of potato plant insect pests.
Key words: Herbal insecticides, Potato plant, Solanum tuberosum, Insect pests, Aqueous decoctions, Azadirachta indica Linn., Embelia ribes Burm., Acorus calamus Linn., Solanum nigrum Linn., Ocimum sanctum Linn., Pongamia glabra Vent.