EA - Artigos publicados em periódicos
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Navegando EA - Artigos publicados em periódicos por Autor "Aguiar, Renata Alves"
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Item Escala diagramática para avaliação da severidade da mancha alvo em folhas de pepineiro(Alexsander Seleguini, 2011-09-30) Teramoto, Adriana; Aguiar, Renata Alves; Garcia, Riccely Ávila; Martins, Marise Cagnin; Cunha, Marcos GomesThe lack of a diagrammatic scale to evaluate the cucumber target spot, caused by Corynespora cassiicola, led to the development of an assessment system for a faster and more reliable way to quantify this disease. So, a diagrammatic scale was elaborated considering the maximum and minimum severity limits of the disease observed in the field. The intermediate values followed logarithmic increments for the target spot symptoms (0.3%, 0.8%, 2%, 5%, 11.5%, 25%, and 46%). For validating the scale, eight raters quantified the disease severity on fifty leaves infected with different levels of the disease. Initially, the severity estimation was carried out without the aid of the scale. Then, the same raters used it to estimate the severity on the same leaves previously assessed. Assessments with the aid of the diagrammatic scale were more precise and accurate, according to most of the raters. The proposed diagrammatic scale was considered adequate to estimate the target spot severity in cucumber leaves, and it can be used in epidemiologic studies and in evaluation strategies for controlling this disease.Item Manejo de ferrugem da soja com fungicidas em tratamento de sementes e aplicação foliar(2012) Araújo, Fernando Godinho de; Rocha, Mara Rúbia da; Aguiar, Renata Alves; Garcia, Riccely Ávila; Cunha, Marcos Gomes daSoybean is an important crop in the economical agriculture of Brazil and it has productive potential compromised by a variety of diseases affecting the crop such as soybean rust (Phakopsora pachyrhizi). The aim of this study was to evaluate the efficiency of incorporating fluquinconazole into the soybean seed treatment in the management of the disease, associated with spray of different fungicides on leaves. The work consisted of two trials side by side on the field. The first trial consisted of several fungicides used to control soybean rust (azoxistrobin, cyproconazole, trifloxystrobin, tebuconazole and prothioconazole) and seed treatment with carbendazim + thiram, and fluquinconazole. The second trail was identical to the first, but without the use of fluquinconazole. The experiment was carried out into two localities – Goiânia (GO) and Senador Canedo (GO). In both experiments, fungicides applied on leaves were effective controlling soybean rust, however the incorporation of fluquinconazole on the soybean seed treatment did not increase the control of the disease since neither it delayed the onset of the disease nor significantly increased the productivity of the crop.