Navegando por Autor "Maeda, Henrique Hiroshi"

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    Influência de extratos foliares de Myrtaceae sobre Sitophilus zeamais motschulsky, 1855 (Coleoptera: Curculionidae)
    (Universidade Estadual do Norte do Paraná, 2019-04-09) Maeda, Henrique Hiroshi; Rando, Jael Simões Santos; https://orcid.org/0000-0002-5191-2996; http://lattes.cnpq.br/2794627489819518; Rando, Jael Simões Santos; http://lattes.cnpq.br/2794627489819518; http://lattes.cnpq.br/2794627489819518; Mihsfeldt, Laila Herta; https://orcid.org/0000-0001-6619-8652; http://lattes.cnpq.br/5443619889613070; Silva, Gabriela Vieira; https://orcid.org/0000-0002-6432-0391; http://lattes.cnpq.br/6593862082231188
    One of the main challenges faced in the storage of corn grains in Brazil is pest management. Sitophilus zeamais is important because of its potential damage to stored grains. Thus, the objective of this work was to evaluate the influence of powders, hydrous alcoholic extracts and essential oils leaves of plants of the family Myrtaceae in the control of S. zeamais. The species tested were: Syzygium jambolanum (Lam.) DC., Psidium guajava L., Myrciaria cauliflora (Mart.) O. Berg, Eugenia uniflora L., Eugenia pyriformis Camb. and Eucaliptus grandis W. Hill. ex Maiden. In order to obtain the hydroalcoholic powders and extracts the collected leaves were submitted to hygiene and two types of drying, in the shade and in a greenhouse at 40 °C for 72 hours. To evaluate the effects of the treatments with the powders (leaves) of each species, impregnations were made on corn grains at concentrations of 1 and 2 g of powder for 10 g of maize. To obtain hydroalcoholic extracts, the powders (from each treatment) were diluted in distilled water + 30% alcohol at 92°, in the proportion of 6 g of powder per 100 mL. In order to obtain solutions of essential oils from eucalyptus, guava and riverwheel leaves, 10 mL of essential oil were mixed in 90 mL of acetone. The insecticidal effects of the treatments with powders, hydrous alcoholic extracts and essential oils were evaluated by the mortality tests and the effects of repellency, by the tests of free choice and without free choice on S. zeamais. The treatments with leaf powders, hydroalcohol extracts and essential oils of E. uniflora leaves were the ones with the highest mortality rates and all the treatments presented repellency effects to S. zeamais, with emphasis on E. uniflora and E. pyriformis. The results demonstrated that extracts leaf of the studied species can be used as an alternative to control S. zeamais in stored corn grains.