Third Instar Nymphs of Rhodnoius prolixus Exposed to #alpha#-Cyanopyrethroids: From Hyperactivity ot Death

摘要

The hyperactivity, incoordination, recovery, and mortality pro- duced by four a-cyanopyrethroids usually used for Chagas ditease vector control (p-cypermethrin, p-cyfluthrin, A.-cyhalothri , and deltamethrin) were evaluated on third instar nymphs Rhodnius prolixus. All pyrethroids modified the locomotor a - tivity of the nymphs, which increased linearly as a function the log of insecticide concentration. A.-Cyhalothrin showed th ~ lowest values of Effective Concentration 50%, Lethal Concen- I tration 50%, Effective Time 50%, and Lethal Time 50% when insecticides were applied by contact with treated filter papers. Recovery from incoordination was observed after topical ap- plication of the insecticides. The recovery was inhibited by the simultaneous application of piperonyl butoxide, suggesting that biotransformation by mixed-function microsomal oxidases is involved in the process of recovery. Arch. Insect Biochem.