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Aedes aegypti (L., 1762) e considerado um mosquito cosmopolita, com ocorrencia nas regioes tropicais e subtropicais. No Brasil, esta restrito as vilas e cidades, sempre com caracteristicas domiciliares e peridomiciliares e, raramente e encontrado em ambientes onde a densidade populacional e baixa. Este mosquito e o unico vetor do arbovirus da dengue e da febre amarela urbana em todo territorio nacional, e e considerado um dos vetores mais importantes na veiculacao de patogenos a humanos. A grande resistencia dos mosquitos a inseticidas quimicos e a frequente preocupacao social com a poluicao ambiental, resultou na procura de alternativas para o controle desses insetos, tais como a utilizacao de bacterias entomopatogenicas. Esse trabalho foi realizado objetivando mensurar a eficacia dessa bacteria no controle das formas imaturas de Ae. aegypti . Para a realizacao deste, foram criadas individualmente 350 larvas de geracao F2 de Ae. aegypti em copos plasticos de 200 ml, contendo 100 ml de agua nao clorada. Na contaminacao foi usado 5mg de Bacillus thuringiensis var. israelensis para cada estagio larval. A analise estatistica foi realizada pelo teste de Mann-Whitney a 5%. A mortalidade das larvas contaminadas foi de 100%, 98%, 98%, 100% e 4% para o 2o, 3o, 4o estagio e pupa A media do numero de dias de vida das larvas apos contaminacao no 1o, 2o, 3o, 4o estagio e pupa foi de 1,36; 2,46; 1,24; 1,22 e 3,46 dias respectivamente, exceto para a pupa, a duracao dos estagios foi menor para os individuos contaminados, (P<0,05). O B. thuringiensis var. israelensis demonstrou ser um bioinseticida eficaz, causando mortalidade total de 99,5% das larvas contaminadas, embora para a fase de pupa nao tenha sido eficaz. Desta forma ele representa uma boa opcao para o controle de larvas de Ae. aegypti , entretanto para as pupas, outras alternativas devem ser estudadas. Evaluation of efficacy of Bacillus thuringiensis var. israelensis on the control of immature forms of Aedes ( Stegomyia ) aegypti (Linnaeus, 1762) in laboratoy. Abstract. Aedes aegypti is considered a cosmopolitan mosquito that lives in tropical and subtropical region. In Brazil, it´s habitat is restricted to cities and villages, living next to humans and being rarelly found in a place with low human density. This especies is the only vector of Dengue and Yellow Fever virus in all brasilian nacional territory. It´s considered one of the most important vectors relationed with the transmission of patogens to humans. The social concearn with the environment and the mosquito´s resistance to chemical insecticides, resulted on the seach of an alternative method to the control of Ae. aegypti . An entomopathogenic bacteria, Bacillus thuringiensis var. israelensis, is an alternative method control. The objective of this work was to measure the eficacy of this bacteria on the control of  Ae. aegypti immature forms. In such case, 350 individuals larvae were criated in plastic glasses with 200ml of non-clorated water. In the contamination were used 5mg of B. thuringiensis var. israelensis water-dispersable grannules for each larval stage. Statistical annalises were performed by Mann-Whitney non-paramethric test. The mortality was 100%, 98%, 98%, 100% and 4%, 1st , 2nd , 3rd 4th stages and pupae, respectivelly. The mean number of live days of the contamined stages were 1,36; 2,46; 1,24; 1,22; 3,46 days. Except for the pupae, all others stages lived less longer that the control individuals (P<0,05%). B. thuringiensis var. israelensis , showed to be an effective inscticide, causing 99,5% of larvae death. And even not being abble to act in the pupae, it represents a good altrnative choice to the control of Ae. aegypti immatured forms.

entomobrasilis

Avaliação da eficácia do &lt;i&gt;Bacillus thuringiensis&lt;/i&gt; var. &lt;i&gt;israelensis&lt;/i&gt; no controle de formas imaturas do &lt;i&gt;Aedes&lt;/i&gt; (&lt;i&gt;Stegomyia&lt;/i&gt;) &lt;i&gt;aegypti&lt;/i&gt; ( Linnaeus, 1762) em ambiente de laboratório.