Resumo. Este estudo teve como objetivo obter uma formulação atrativa à base de óleo de citronela e seus componentes voláteis para captura de Diabrotica speciosa (Germar). Três experimentos sequenciais foram realizados em culturas de abobrinha ou pepino. Os insetos foram coletados por armadilhas de garrafa PET com três aberturas laterais, contendo um volume de 200 ml de cada formulação, suspensas a 10 cm do nível do solo numa área experimental de 30 m2. No primeiro experimento foram testados óleo de citronela em 1, 2 e 4%. No segundo investigou-se também a ação de citronelal, citronelol e geraniol a 1%. E, o citronelol a 0,5, 1 e 2% foi testado no terceiro experimento. Como resultado observou-se que a formulação contendo citronelol a 0,5% foi estatisticamente superior às demais. Outros insetos foram capturados pelas armadilhas como coleópteros Diabrotica viridula (Fabricius)e Astylus variegatus (Germar), e também exemplares de Diptera, Hemiptera e Hymenoptera. Considerando a alta demanda por alimentos orgânicos e da preocupação com o ambiente e a saúde, a emulsão a base de citronelol em 0,5% cumpre adequadamente o seu objetivo, garantindo uma boa capacidade atrativa para D. speciosa. Esta formulação pode ser usada paralelamente com outros métodos alternativos para reduzir a presença desse inseto nas culturas.Citronella (Poaceae) essential oil and its components for the control of brasileirinho (Coleoptera: Chrysomelidae) in vegetable cropsAbstract. The present study aimed to get an attractive formulation of oil-based citronella and its volatile components to capture Diabrotica speciosa (Germar). Three sequential experiments were performed in zucchini or cucumber crops. The insects were collected in PET bottle traps with three lateral apertures, containing a volume of 200 ml of each formulation, suspended 10 cm above the ground level in an experimental area of 30 m2. In the first experiment citronella essential oil was tested at 1, 2 and 4%. In the second experiment the action of citronellal, citronellol and geraniol at 1% were investigated. Furthermore, citronellol at 0.5, 1 and 2% has been tested in the third experiment. As a result it was observed that the formulation containing 0.5% citronellol was statistically higher than the other tested formulations. Other insects were captured by the traps as the beetles of Diabrotica viridula (Fabricius)and Astylus variegates (Germar), and also copies of Diptera, Hemiptera and Hymenoptera. Considering the high demand for organic food, and concern for the environment and health, the citronellol emulsion at 0.5% adequately fulfilled its goal, ensuring a good attractive capacity for D. speciosa. This formulation can be used simultaneously with other alternative methods to reduce the presence of such insects in crops.
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