Studies on the Toxicity of Cyhalothrin to Xenopsylla cheopis

Objective The paper reported the results of study on the toxiticy of cyhalothrin to Xenospylly cheopis in laboratory.Methods The residual smearing method was used.Results(1) The KT_(50) was getting shorter with the concentration gradually creasing,and the death rates of 24 h were getting higher.(2) When the concentration of cyhalothrin were(12.50 mg/L),(25.00 mg/L),(50.00 mg/L) and(100.00 mg/L),the KT_(50)6 minutes,and the knock down rates of 11 minutes (63.0%),the death rates of (24 h)(84.0%).(3) When the concentration of cyhalothrin were(50.00 mg/L) and(100.00 mg/L),the shoot down rates of 30 minutes in 450 days were 100% and the death rates of(24 h) in 450 days (93.0%).Conclusion The toxicticy of cyhalothrin to Xenospylly cheopis is very good and cyhalothrin can be used to control the plague in field.