FIELD MONITORING OF CYPERMETHRIN RESIDUAL EFFECT ON THE MORTALITY-RATES OF THE PHLEBOTOMINE SAND FLY LUTZOMYIA-LONGIPALPIS IN THE STATE OF PARAIBA, BRAZIL

In a visceral leishmaniasis endemic locality of northeast of Brasil wh ere all settlements were treated with cypermethrin, a follow-up of Lut zomyia longipalpis populations was carried out by regular collections. The residual effect of the insecticide was studied using biological a ssays on three different types of walls. The results showed that the i nsecticides had an effect on intradomiciliar Lu. longipalpis populatio ns limited to two months, and had no significant effect on peridomicil iar vector populations. The mortality rates of the tested sandflies we re variable according to the type of wall. The decreasing of the insec ticide 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.