Efficacy of Pongamia glabrr Vent. Extracts so Feeding and Development of Spodoptera litura (Fabricius)

Laboratory study on the effect of some extracts of P. glabra on feeding and development of S. litura revealed that karanjin with Al₅₀ value of 0.30% was more effective in causing antifeedancy than other extracts. It was followed by hexane extract (0.95%), methanol extract (1.84%), and pongamia oil without karanjin (Po-k) (3.71%). Larval weight reduction on 3 DAT showed that karanjin at 0.34% reduced 50% larval weight gain, followed by hexane (0.98%), Po-k (4.08%) and methanol (9.25%) extract. Karanjin was also most effective (0.58%) to inhibit 50% normal adult emergence from the treated larvae, followed by hexane (1.66%), Po-k (4.18%) and methanol extract (5.47%). The order of effectiveness was: hexane extract > karanjin > karanjin removed pongamia oil > methanol exttact > aqueous extract.