Field monitoring of cypermethrin residual effect on the mortality rates of the Phlebotomine sand fly Lutzomyia longipalpis in the state of Paraíba, Brazil.
In a visceral leishmaniasis endemic locality of northeast of Brasil where all settlements were treated with cypermethrin, a follow-up of Lutzomyia longipalpis populations was carried out by regular collections. The residual effect of the insecticide was studied using biological assays on three different types of walls. The results showed that the insecticides had an effect on intradomiciliar Lu. longipalpis populations limited to two months, and had no significant effect on peridomiciliar vector populations. The mortality rates of the tested sandflies were variable according to the type of wall. The decreasing of the insecticide effect was marked since the 3rd month, and mortality rates were identical whatever the type of wall since the 4th month. Unsufficient residual effect was detected after the 4th month.
De Silans
L N
LN
Fundação Nacional de Saúde da Paraíba, João Pessoa, PB, Brasil.
Dedet
J P
JP
Arias
J R
JR
D000818:Animals; D001681:Biological Assay / Q000379:methods*; D001938:Brazil; D004784:Environmental Monitoring; D005500:Follow-Up Studies; D007303:Insect Vectors / Q000187:drug effects*; D007306:Insecticides / Q000494:pharmacology*; D007898:Leishmaniasis, Visceral / Q000469:parasitology; D010573:Pesticide Residues / Q000494:pharmacology*; D011576:Psychodidae / Q000187:drug effects*; D011722:Pyrethrins / Q000494:pharmacology*; D013997:Time Factors
D007306:Insecticides; D010573:Pesticide Residues; D011722:Pyrethrins; C017160:cypermethrin