In order to determine the antifeedant and oviposition repellent effect of extracts from Nerium indicum to Pieris rapae.Extract volatile matter was extracted from flower of N. indicum.Biologial activity of antifeedant effect and oviposition repellent on P. rapae was tested with extraction of N. indicum.The results showed that extracts of N.indicum had strong antifeedant effect to 3-instar larvae of P. rapae and repellent effect to P. rapae adult.When the extract concentration was 500 g/L,selective antifeedan...