关键词: 驱出效果, 德国小蠊, 抗药性

Abstract: This research reported that deltamethrin resistant strain of the German cockroach were tested for flushing out effect by insecticides by the time flushing out response method in comparison with a known susceptible strain in laboratory and analogue field. The values of FT₅₀ of cockroach, which resistant ratio was 18.13 to deltamethrin, sprayed by 0.3% permethrin,0.05% deltamethrin, 0.1% high effect cypermethrin,0.3% cyphenothrin, and 1.0% DDVP alcohol solution were more than 120min, unless by DDVP was 34.06min, comparing with 2.24,1.261.85,3.25,6.81min respectively for the susceptible strains at the dose of 53ml/m³. The FT₅₀ of resistant strain were 14.2 min treated by 0.3% permethrin+1.0% DDVP and more than 120min sprayed by 1.0% permethrin and 0.5% deltamethrin respectively. The FT₅₀ of resistant strain were 24.44 min treated by 0.3% permethrin+1.0% DDVP and more than 120min sprayed by 0.3% permethrin comparing with 5.14min for the susceptible strains tested in the analogue field at the dose of 50ml/m². The result indicated that the effect of flushing out was obviously weak for pyrethroid to resistant strain. It was suggested that the cockroach investigation was carried out by 0.3% permethrin with 1.0% DDVP treatment or by stick method.