Shirshedu Shil Trivedi and BS Chandel

A field experiment was conducted to evaluate comparative bio efficy of four naturally occurring indigenous plant extracts against destruction of Bihar hairy caterpillars, Spilosoma obliqua Walker (Lepidoptera: Arctiidae) under mustard agroecosystem. The Unripe fruits of custard apple, Annona squamosa Linn. (71.78 per cent), Karanj, leaves of Pongamia glabra Vent. (Fabaceae), arial parts of ariappl, Lantana camara Linn. (46.27 per cent), leaves of Black Pepper, Piper nigrum Linn (Piperaceae) were collected in the vicinity of Kanpur, shade dried and make them powder farm and extracted them with the help of soxhlet apparatus using alcohol, acetone Petroleum either as solvent. From stolk solution we make different concentrations (0.5, 1.0 and 2.0 per cent) and each different concentration of each plant extract. In field study there are three treatments were used and each treatment with three concentration were introduced. It is obvious from results that Unripe fruits of custard apple, Annona squamosa Linn. showed maximum larval mortality 71.78 per cent and placed at top followed by, Karanj, leaves of Pongamia glabra Vent.(62.63 per cent), leaves of Black Pepper, Piper nigrum Linn (55.52 per cent) whereas arial parts of ariapple, Lantana camara Linn. Gave only 46.27 per centlarval mortalty to the Bihar hairy caterpillars, Spilosoma obliqua Walker under mustard agroecosystem.

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