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...
RESUMOO presente trabalho teve como objetivo avaliar a toxicidade por fumigação, o efeito repelente, o efeito na oviposição e na emergência da geração F1 dos óleos essenciais de Croton heliotropiifolius Kunth., Croton pulegiodorus Baill., Myracrodruon urundeuva Allemão e Ocimum basilicum L. sobre Zabrotes subfasciatus, em cinco doses (0,0, 5, 10, 15 e 20 μL L -1 de ar (Coleoptera: Chrysomelidae) in common beans stored ABSTRACTThe present study aimed to evaluate the toxicity by fumigation, the repellent effect, the effect on the oviposition and emergence of the F1 generation of essential oils of Croton heliotropiifolius Kunth., Croton pulegiodorus Baill., Myracrodruon urundeuva Allemão and Ocimum basilicum L. on Zabrotes subfasciatus, in five doses (0.0, 5, 10, 15 and 20 μL L -1 of air). Track fumigation the essential oils of O. basilicum and C. pulegiodorus caused 100% mortality of adults of Z. subfasciatus, at all doses except the witness. The oils of O. basilicum, C. pulegiodorus and M. urundeuva were repellents in all doses, while C. heliotropiifolius doses 20 e 5 μL were classified as neutral and other repellents. In this sense, the oils of O. basilicum and C. pulegiodorus resulted in the highest values of reduction of eggs and 100% reduction in adults emerged, featuring ovicidal effect/larvicide about Z. subfasciatus during storage. It is therefore considered that the oils of O. basilicum and C. pulegiodorus are promising in the control of populations of Z. subfasciatus, being required further studies to define the best dose to be used, as well as the best way of application.
The objective of this work is to evaluate the adaptability and phenotypic stability of the RB sugarcane genotype using the AMMI method. The experiments were performed in five production units in the state of Pernambuco, in cultivars of sugarcane soca and ressoca, using 14 RB sugarcane genotypes-11 RB clones of series 2004 and three cultivars as controls. Each combination of production unit × cutting was considered as environment, for a total of 13 environments. The experimental design was with random blocks, and four repetitions. We estimated the parameters tons of sugarcane per hectare (TCH) and tons of pol per hectare (TPH). The genotype G12 displayed general adaptability, phenotypic stability and high productivity for the two parameters. The genotypes G10, G13 and G14 had the highest yield, largest contribution of G×E, indicating specific adaptability. The environments A12 and A13, in Primavera, are recommended for preliminary selection trials.
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