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Resumo. A acao hematofagica exercida por femeas de algumas especies de Culicidae sobre o homem e outros animais pode estar diretamente relacionada a transmissao de patogenos, alem de provocar reacoes alergicas e causar incomodo. O aparecimento de populacoes resistentes aos inseticidas quimicos impulsiona o uso de metodos de controle alternativos, principalmente o biologico. Objetivando testar a eficiencia e persistencia de produtos comerciais com principio ativo a base de Bacillus thuringiensis israelensis Berliner e Bacillus sphaericus Neide foram realizados experimentos em tres lagoas de tratamento de efluentes, sobre larvas de Culicidae. Testou-se Vectolex (formulacao granulada de B. sphaericus ), Sphaericus (Formulacao liquida de B. sphaericus ) e Bt-horus (formulacao liquida de B. thuringiensis ). As aplicacoes foram realizadas quinzenalmente com avaliacoes realizadas a 0, 24, 48, 72 e 120 horas apos a aplicacao. As lagoas estavam colonizadas por Culex nigripalpus Theobald (1,5%), Culex saltanensis Dyar (2,25%) e Culex quinquefasciatus Say (96,25%). Com o produto Bt horus, registrou-se reducao larval de 89,06%, 83,97% e 89,96% respectivamente a 24, 48 e 72 horas apos a aplicacao. Nos produtos contendo B. sphaericus , respectivamente na formulacao granulada e liquida observou-se uma reducao de 98,89 % e 98,34%, apos 24 horas da aplicacao e de 99,79% e 99,78% apos 48 horas. Os produtos e as diferentes formulacoes foram eficientes no controle de larvas das tres especies de culicideos em lagoas com grande quantidade de materia orgânica, porem a persistencia verificada foi de dois e tres dias para produtos contendo respectivamente B. sphaericus e B. thuringiensis israelensis . Efficiency and Persistence of Three Commercial Products Based on Bacillus thuringiensis israelensis and Bacillus sphaericus in Controlling Culicidae (Diptera) in Effluent Treatment Lagoons Abstract. The hematofagic effect caused by females belonging to some species of Culicidae on humans and animals can be directly related to pathogen transmission, allergic reactions and uneasiness. The emergence of populations resistant to chemical insecticides has fostered the use of alternative methods, mainly biological control. The trials were conducted in three effluent treatment lagoons, on larvae of Culicidae to test the efficiency and persistence of commercial products whose active principles are based on Bacillus thuringiensis israelensis Berliner and Bacillus sphaericus Neide. The products tested were Vectolex (a granulated formulation of B. sphaericus ), Sphaericus (a liquid formulation of B. sphaericus ) and Bt-horus (a liquid formulation of B. thuringiensis ). The products were applied biweekly and evaluations were conducted 0, 24, 48, 72, and 120 hours after each application. The lagoons were colonized by Culex nigripalpus Theobald (1.5%), Culex saltanensis Dyar (2.25%), and Culex quinquefasciatus Say (96.25%). Bt-horus reduced larvae by 89.06%, 83.97% and 89.96% at 24, 48 and 72 hours after product application, respectively. The granulated and the liquid formulations containing B. sphaericus reduced larvae by 98.89 % and 98.34% 24 hours after application, and by 99.79% and 99.78% after 48 hours, respectively. The products and the different formulations were effective in controlling larvae of all three Culicidae species in lagoons with high levels of organic matter, but the persistence was recorded in two and three days for products containing respectively B. sphaericus and B. thuringiensis israelensis .

entomobrasilis

Eficiência e Persistência de Três Produtos Comerciais à Base de &lt;i&gt;Bacillus thuringiensis israelensis&lt;/i&gt; e &lt;i&gt;Bacillus sphaericus&lt;/i&gt; no controle de Culicidae (Diptera) em Lagoas de Tratamento de Efluentes