The residual contact toxicity of bay sir 8514 toSpodoptera littoralis larvae

The contact effect of residues on glass of the chitin synthesis inhibitor BAY SIR 8514 againstSpodoptera littoralis (Boisduval) larvae was investigated and probitlog dosage curves were established. The ED₅₀ for cumulative mortality up to the adult stage was 0.0017 g/m² for 100-mg and 0.004 g/m² for 200-mg larvae. The toxicity of BAY SIR 8514 through this route of administration was considerably higher than that of diflubenzuron found in previous work.