ANTIFEEDANT ACTIVITY OF CRUDE EXTRACTS FROM STEMS AND LEAVES OF TADEHAGI TRIQUETRUM (L.) OHASHI AND SEEDS OF PHASEOLUS LATHYROIDES AGAINST HELICOVERPA ARMIGERA HÜBNER (LEPIDOPTERA: NOCTUIDAE).
T Maison, T Ruttanaphan, P Pipattanaporn, P Chuawong, V Bullangpoti, W Pluempanupat
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Abstract
Efficacy of hexane, dichloromethane, ethyl acetate, and methanol crude extracts of stems and leaves of Tudehagi triquetrum (Legumin: Papilionaceae) and seeds of Phaseolus lathyroides (Leguminiale: Papilionaceae) was examined for the antifeedant activity against third instars larvae of Helicoverpa armigera using leaf disc no-choice method in the range of 0 to 2% concentrations for 6 and 12 hours. The ethyl acetate extract from T. triquetrum was the most effective at 6 hours with FI50 of 0.5346%, while the hexane extract from P. lathyroides only exhibited 0.7228% FI50 value at 6 hours. The antifeedant effect appeared to be time and concentration dependent, i.e. feeding deterrence depleted with increased exposure. Moreover, it is obvious from our study that both extracts could be used under short-term applications in an integrated pest management strategy of pest control.
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