Bioactivity of Sedum spectabile Boreau Extracts against Pieris rapae

The antifeeding and contacting activities of the ethanol extracts from Sedum spectabile Boreau against 3rd instar larvae of Pieris rapae were determined in laboratory.[Methods] The leaflets disc method and immersion method were adopted respectively to test the antifeeding and contacting activities of the ethanol extracts against P.rapae.[Results] The LC50 were 7.768 and 0.183 g/L respectively at 48 and 72 h by dipping method,and the adjusted mortality were both 100%.The highest antifeeding rate were 99.15 and 91.94% respectively at 24 and 48 h,and the AFC50 were 4.819 and 15.442 g/L respectively.[Conclusions] Ethanol extracts from S.spectabile Boreau has high contacting and antifeeding effects against 3rd instar larvae of Pieris rapae,which provides a new plant resource for biopesticides.