| Abstrakt: |
Of 10 pyrethroids tested by topical application of male German cockroaches, Blattella germantca (L.), d-phenothrin was the least toxic at 19, 26, or 31oe. X-cyhalothrin was most toxic. Pyrethroids with the α-cyano moiety (fluvalinate, fenvalerate, cypermethrin, esfenvalerate, tralomethrin, cyfluthrin, and λ-cyhalothrin) were more toxic than those without this functional group (d-phenothrin, resmethrin, and permethrin). At LC50, toxicity was negatively related to temperature. Temperature-toxicity responses of five of seven a-cyano pyrethroids were parallel, possibly indicating qualitatively identical but quantitatively different levels of detoxification enzymes. |
