Studies on Antifeedant Activity of Cnidium monnieri against the Larvae of Pieris rapae L.
Antifeedant activity of Cnidium monneri,a umbelliferae plant,was first reported in this paper.The air-dried and powdered plant was extracted with methanol,50% acetonitrile,acetone,ethyl acetate,diethyl ether,chlorform,and the AFC 50 of 3.658,0.700,0.525,1.407,0.973 and 1.958g/L were found respectively after the treatment of 24 h.The diethyl ether crude extract was separated by normal-phase silica column and five effluents were obtained,the fourth and the fifth effluents of which were proved to possess better antifeeding effects on the larvae of Pieris rapae L.Through HPTLC techniques ,the fourth and the fifth effluents were found to have two common substances according to the Rf values.