The simulated methods of exposure to insecticides were developed to ascertain the relationship between the mortality, knockdown effect, flushing effect and residual interval of commercial aerosols by field-application rates. The adult German cockroaches, Blattella germanica (L.) and the American cockroach, Periplaneta americana (L.) from cohorts of Taipei, Taichung, and Kaohsiung in Taiwan were tested with 10 commercial aerosols. The active ingredients included tetramethrin, d-tetramethrin, cyfluthrin, permethrin, ipiprothrin, pyrethrin, d-allethrin, cypermethrin, s-bioallewthrin, cyphenothrin, deltamethrin and propoxur etc. varied in different products. The KT50, KT95, FT50, FT95, 30 minutes knockdown and 24 hours mortality were recorded during the tests. Among the 10 products the residual effect of products G and J on German cockroaches showed that KT50 longer than 30 minutes. American cockroaches were tested by glass cylinder method, the KT50 of product I longer than 30 minutes with low 24 hours mortality (6.67%). The glass chamber test showed the good efficacy on American cockroaches most tested products resulted 100% knockdown in 30 minutes and 100% mortality in 24 hours except product H and I. The Taichung strains of German cockroaches and American cockroach showed more susceptible to the aerosols than Taipei and Kaohsiung strains. The A, B, C, and D products showed the similar results as their original reiterated data, but the J product was lower mortality at 14 days residual effect. There were no significant different on residue effects between glass chamber method and glass cylinder method. There were significant different of knockdown effect on space spray in glass room test. The results were examined with registered data, there no significant different among A, B, C, and F products. But product J was less residual activity compared to registered data. Key words: Aerosol, KT50, FT50, mortality, glass cylinder method, glass chamber method, residue method, German cockroach, American cockroach

Aerosol,KT50,FT50,mortality,glass cylinder method,glass chamber method,residue method,German cockroach,American cockroach