The results on the toxicity of diamide group of insecticides to diamond back moth, Plutella xylostella (L.) indicated that the LC50 and LC95 values of flubendiamide for F1 to F12 generation decreased from 0.016 to 0.003 and 0.233 to 0.213 ppm, respectively; and with chlorantraniliprole these decreased from 0.011 to 0.002 and 0.407 to 0.095 ppm, respectively. The corresponding values of cyantraniliprole decreased from 0.000990 to 0.000365 and 0.038 to 0.028 ppm, respectively. Considering the F12 generation as susceptible, the tentative discriminating doses (DD) by leaf disc method to third instar larvae were arrived at as 0.003, 0.002 and 0.000365 ppm for flubendiamide, chlorantraniliprole and cyantraniliprole, respectively based on LC50.

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