Potencial inseticida de óleos essenciais sobre Tribolium castaneum em milho armazenado

Abstract

RESUMO:O presente trabalho teve como objetivo investigar o potencial inseticida de óleos essenciais de Croton heliotropiifolius, Croton pulegiodorus, Myracrodruon urundeuva e Ocimum basilicum sobre adultos de Tribolium castaneum em milho armazenado. Para cada óleo foram realizados bioensaios de fumigação, repelência e o efeito sobre a taxa instantânea de crescimento (r i ), em cinco concentrações (0; 5; 10; 15 e 20 μL). Os bioensaios foram conduzidos sob condições constantes de temperatura (28±2 ºC), umidade relativa (70±5%) e escoto fase de 24 horas. Nos testes de fumigação diferentes concentrações dos óleos foi aplicado em tiras de papel filtro presas na parte inferior da tampa da câmara de fumigação (1,5L), a qual continha 20 gramas de substrato alimentar e 10 insetos adultos de T. castaneum não sexados. A mortalidade dos insetos foi avaliada após 48 horas de exposição. Os testes de repelência foram efetuados em arenas compostas por dois frascos ligados a uma caixa central. Em um frasco foi depositado o substrato alimentar com diferentes concentrações do óleo essencial, e, no outro, foi depositado apenas alimento (testemunha). Dez insetos adultos foram liberados na caixa central, ficando expostos por 5 dias para avaliação da preferência. Nos bioensaios de fumigação observou-se atividade inseticida do óleo essencial de M. urundeuva sobre adultos de T. castaneum. Nos bioensaios de repelência, todos os óleos testados apresentaram efeito repelente. A emergência de T. castaneum reduziu entre 33 e 100% quando foram criados em pó de milho tratado com os óleos essenciais. Os óleos essenciais de C. pulegiodorus e O. basilicum ocasionaram redução do crescimento populacional de T. castaneum em grãos de milho tratados. Os óleos testados demonstraram ser uma alternativa eficiente de controle para o uso nos programas de manejo de T. castaneum em unidades armazenadoras. Palavras-chave: Controle alternativo, inseticidas botânicos, grãos armazenados.ABSTRACT: Insecticidal potential of essential oils on Tribolium castaneum in stored maize. The current work aimed at to investigate the insecticide potential of essential oils of Croton heliotropiifolius, Croton pulegiodorus, Myracrodruon urundeuva and Ocimum basilicum on adults of Tribolium castaneum in stored maize. For each oil, it were performed fumigation tests, repellency and the effect on the instantaneous rate of increase (r i .), in five concentrations (0; 5; 10; 15 e 20 μL). Bioassays were carried out under constant temperature conditions (28±2 °C), relative humidity (70±5%) and scot phase of 24 hours. In fumigation different concentrations of test oils were applied on filter paper strips attached on the bottom of the fumigation chamber cover (1.5 L), which contained 20 grams of food substrate and 10 unsexed adults of T. castaneum. The insect mortality was recorded after 48 hours of exposure. The repellency tests were performed in arenas composed of two pots connected to a central box. In a pot it was deposited feed substrate, with concentrations of the essential oil, in...

CONTACT TOXICITY OF ESSENTIAL OIL OF Croton pulegiodorus BAILL ON Sitophilus zeamais MOTSCHULSKY

“…Brito et al (2015) evaluated essential oils of Croton heliotropiifolius Kunth (Euphorbiaceae), C. pulegiodorus, and Myracrodruon urundeuva Allemão (Anacardiaceae) on coleoptera pests of stored common bean and found a reduction in adult emergence through ovicidal/larvicidal effect. Similarly, Magalhães et al (2015) reported that essential oils of C. pulegiodorus and C. heliotropiifolius caused 100% reduction in emergence of T. castaneum in stored maize.…”

“…Studies have shown the potential of using essential oils as an alternative method for seed protection and control of several pests of stored products in Brazil (COITINHO et al, 2011;BRITO et al, 2015;MAGALHÃES et al, 2015;SOUZA et al, 2016;ARAÚJO et al, 2017). Essential oils present different effects on insects (SUTHISUT; FIELDS; CHANDRAPATYA, 2011; KŁYS; MALEJKY; NOWAK-CHMURA, 2017), causing biochemical, physiological, and behavioral disorders that lead to their death or affect their development and reproduction (CABALLERO-GALLARDO; OLIVERO-VERBEL; STASHENKO, 2011, CHAUBEY, 2016).…”

“…Several species of the Croton genus (Euphorbiaceae) have been evaluated due to their insecticidal potential on coleoptera and lepidoptera pests of stored products (SILVA et al, 2009;SILVA et al, 2012b;CARVALHO et al, 2016). The fumigant and repellent effects of the essential oil of Croton pulegiodorus Baill were recently proven on pests of stored common bean and maize grains (BRITO et al, 2015;MAGALHÃES et al, 2015;SOUZA et al, 2016).…”

LEAF ESSENTIAL OIL FROM Croton pulegiodorus Baill SHOWS INSECTICIDAL ACTIVITY AGAINST Sitophilus zeamais Motschulsky

“…Thus, for example, in kidney beans, Silva et al (2008) found that Croton grewioides Baill essential oil had a fumigant effect on adults of Z. subfasciatus, Brito et al (2015) observed that C. pulegiodorus and Croton heliotropiifolius Kunth essential oils caused 100% mortality in adults of Z. subfasciatus at all concentrations evaluated (5, 10, 15 and 20 µL L -1 air), in addition to having a repellent effect on insects; Carvalho et al (2016) observed toxicity (fumigant effect) of Croton urucurana Baill essential oil on C. maculatus, causing mortality rates greater than 80% and effects on the biology and survival of this beetle. Similarly, in maize, Magalhães et al (2015) reported that C. pulegiodorus and C. heliotropiifolius essential oils had a repellent effect and caused zero emergence of T. castaneum, while Souza et al (2016) observed that C. pulegiodorus essential oil caused mortality rates above 70% in R. dominica, when used at higher concentrations.…”

“…The worldwide-distributed genus Croton L. (Euphorbiaceae), in turn, has proven promising for the management of insect pests of stored products (PEREZ-AMADOR et al, 2007). In Brazil, where research on insects that mainly attack beans and cereals has made important progress in recent years, it is worth mentioning the studies analyzing the effect of essential oils from various Croton species on Callosobruchus maculatus Fabricius and Zabrotes subfasciatus Bohemann (Chrysomelidae) (BRITO et al, 2015;CARVALHO et al, 2016), Tribolium castaneum Herbst (Tenebrionidae) (MAGALHÃES et al, 2015), and Rhyzopertha dominica Fabricius (Bostrichidae) (SOUZA et al, 2016).…”