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.
Different temperatures affect the effect of controlling pine caterpillars, Dendrolimus punctatus, by B.t pesticide apparently.While using B.t pesticide,the mortality of D.punctatus decreased as the temperature dropped.From the result of 4 temperature gradient tests,it was showed that 20 ℃ is the threshold that determine the effect of controlling D.punctatus by B.t. The results shows that different temperatures affect the feeding deterrence of the B.t to the D.punctatus larvae also,but in the all temperature treatments,the feeding deterrences are apparent consistently.
