This paper reported the biological activities of five synthetic philanthotoxin analogs.Trials under laboratory condition indicated a certain level of activity on poisoning and inhibiting emergence rate.The LC50 of compound 1 on Ectropis obliqua was 8.987×103 mg·L-1.At the 8×103 mg·L-1 dosage of compound 1,the adjustment rate of pupation and emergence of E.obliqua was 52.44% and 89.81% respectively.The compound 2 had a certain effect on the larval and pupal weight.
