Third instar nymphs of Rhodnius prolixus exposed to alpha-cyanopyrethroids: from hyperactivity to death.

Abstract

The hyperactivity, incoordination, recovery, and mortality produced by four alpha-cyanopyrethroids usually used for Chagas disease vector control (beta-cypermethrin, beta-cyfluthrin, lambda-cyhalothrin, and deltamethrin) were evaluated on third instar nymphs of Rhodnius prolixus. All pyrethroids modified the locomotor activity of the nymphs, which increased linearly as a function of the log of insecticide concentration. lambda-Cyhalothrin showed the lowest values of Effective Concentration 50%, Lethal Concentration 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 application 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.

• Authors: R A Alzogaray, E N Zerba
• Journal: Archives of insect biochemistry and physiology (Arch Insect Biochem Physiol) Vol. 46 Issue 3 Pg. 119-26 (Mar 2001) ISSN: 0739-4462 [Print] United States
• PMID: 11276069 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright 2001 Wiley-Liss, Inc.

Chemical References

• Insecticides
• Nitriles
• Pyrethrins
• decamethrin
• cyfluthrin
• cyhalothrin

Topics

• Animals
• Insect Control
• Insecticides
• Lethal Dose 50
• Linear Models
• Motor Activity
• Nitriles
• Nymph
• Pyrethrins
• Rhodnius