Studies On Resistance Of Chilo Suppressalis From Different Place Of Hunan And Mechanism Of Resistance To Triazophos

Chilo suppressalis (Walker) is a main pest of rice in china especial in south of china. Recently, It farm corp heavily in area of changjiang including Hubei,Hunan,Jiangxi etal and north of it .This research showed that Chilo suppressalis (Walker) is high resistant to Triazophos. monosultap and fenvalerate, their resistace factor is 139,139.3 and 133 respactively.esterase appeared to be one of the important resistant factor in this laboratory selected resistant strain. Carboxylesterase activity was significantly 20.1 fold higher in the tri resistant strain than that of the Triazophos susceptible strain when a -NA were used as substrates, futher polyacrylamide gel electrophoresis (PAGE) analysisrevealed that the esterase from resistant and susceptible strains involves different isoenzyme composition which implied that the changes of carboxylesterase isoenzymes is involved in the mechanisms for Triazophos resistance in cotton bollworm.