On the exposure to high concentrations, the larval body retraction accompanied with a sluggish surface behaviour was observed. Combined effect or synergistic effect of various control agents have proved very advantageous in the con trol of various pests24,25. The Pongamia extract has been considered as a good synergist and hence has been combined with several pest control agents in the control of various pests26,27. In the present study likewise the Pongamia extract has acted as a powerful synergist with A. squamosa. Individual plant extracts are active only at high concentration, which makes them uneconomical for field use
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