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Experimentos foram feitos no laboratório e no campo nos anos de 1980 a 1984, objetivando detectar as causas do repovoamento de criadouros de Biomphalaria glabrata após tratamento com niclosamida. Os bioensaios no laboratório mostraram que a suscetibilidade à niclosamida emulsionável de B. glabrata coletada mensalmente em um sistema de valas de irrigação, variou durante o ano. As concentrações letais CL90 foram 0,15 mgl-1 a 0,60 mgl-1, apresentando diferenças significantes estatisticamente (p < 0,01) nos meses de maio/82 e janeiro/83 e dezcmbro/82 e janciro/83, relacionadas a nutrição. No campo, foram tratados dois tipos de focos com solução aquosa a 10 ppm de niclosamida. O primeiro era formado por reservatório com cerca de 12.000 litros de água e continha 14,5% de moluscos infectados pelo Schistosoma mansoni. Uma única aplicação do produto, seguida de esvaziamento e limpeza do reservatório, eliminou os moluscos. O segundo, era constituído por sistema de valas e poço com 5,6% de moluscos infectados por S. mansoni. Uma única aplicação do produto, sem limpeza das valas, reduziu a densidade planorbídica 98%. As causas da sobrevivência de 2% dos moluscos do sistema de valas, são discutidas, sendo relacionadas ao substrato do criadouro e a técnica utilizada no tratamento. Experiments were undertaken both in the laboratory and in the field between 1980-1984 to evaluate the causes of repopulation of breeding places of Biomphalaria glabrata following treatment with Niclosamide. Laboratory bioassays showed that the susceptibility to emulsifiable Niclosamide of B. glabrata collected monthly from an irrigation ditch system varied during the year. Lethal concentrations (LC90) ranged between 0.15 mg/l-1 and 0.60 mg/l-1. Statistically significant differences (alpha=0.01) were evident between the months of May/82 and January/83 and December/82 and January/83, and were related to snail nutrition. In the field two types of foci of B. glabrata were treated with 10 ppm of Niclosamide. The first one consisted of a reservoir of 12000 1 of water in which 14.5% of snails were infected with Schistosoma mansoni. One application of molluscicide followed by cleaning of the reservoir eliminated all the snails. The second one consisted of an irrigation system in which 5.6% of the snails were infected with S. mansoni. One application of molluscicide without cleaning the ditches reduced the density of snails by 98%. The causes of the survival of 2.0% of the snails in the ditches are discussed in relation to the substratum of the breeding places and the treatment technique

Repovoamento de criadouros de Biomphalaria glabrata após tratamento com niclosamida