Status of medicinal plants with respect to infestation of insect pests in and around Chitrakoot, District-Satna (M.P.).
Medicinal plants in Chitrakoot, Madhya Pradesh, India, were studied for insect pest infestation. Of the 245 medicinal plants surveyed, 43 were infested by 70 insect pests. More than one pest fed on the same plant. Withania somnifera (Diacrisia obliqua [Spilarctia obliqua], Tricentrus bicolor and Epilachna vigintioctopunctata), Mentha sp. (Chrysolina exanthematica, Helicoverpa armigera, Autographa chryson, Euxoa segetum [Agrotis segetum], Diacrisia obliqua and Chilo sp.) and Cannabis sativa (Helicoverpa armigera, Diacrisia obliqua, Spodoptera exigua, S. litura and Microtermes obesi) were among the plants attacked by the highest number of insects. Odontotermes sp., Diacrisia obliqua, Helicoverpa armigera, Spodoptera litura and Agrotis ipsilon infested more than 6 medicinal plants in the area. The insecticidal activity of the leaf extracts of Lantana, Parthenium, Hyptis and Ipomoea carnea at 1.0, 2.5 or 5.0% was evaluated against the insect pests. Insect mortality was positively correlated with the extract concentration. Up to 40% mortality was observed in most of the treated pests.