Toxicity of spinosad to Plutella xylostella（L.）and its natural enemies

The toxicities of spinosad to Plutella xylostella and its natural enemies are evaluated in this paper.The results show that spinosad has a high toxicity to P.xylostellaand a high efficacy against the pest in fields.Spinosad has a lethal effect on Paederus fuscipes and C.plutellae，but no significant effect on Lycosa psedoannulata.For C.plutellae，the treatment with 1000 times dilution of 2.5% CAIXI causes its mortality of 62.2% after 24h and 88.7% after 36h.The side-effects of spinosad on parasitoid of P.xylostella are very high and should be considered when the pesticide is used.