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Epidemiologic Study of Ramularia areola under Different Soil Covers and Spacings,for Cotton Crops

American Journal of Plant Sciences 2013年第11期4卷 2049-2059页

作者： Jaqueline Aguilla Pizzato Dejania Vieira Araújo milson evaldo serafim Kelly Lana Araújo Rivanildo Dallacort Thiago Alexandre Santana Gílio Jair Romano Jr Vanderlei Antunes Maciel Programa de Pós-graduacao em Ambiente e Sistemas de Producao Agrícola Universidade do Estado de Mato GrossoTangaráda SerraBrasil Instituto Federal de Educacao Ciência e Tecnologia de Mato Grosso—IFMTCáceresBrasil Laboratório de Melhoramento Genético Vegetal.Universidade do Estado de Mato Grosso CáceresBrasil Programa de Pós-graduacao em Genética e Melhoramento de Plantas Universidade do Estado de Mato GrossoTangaráda SerraBrasil Laboratório de Fitopatologia Universidade do Estado de Mato GrossoTangaráda SerraBrasil

The objective of this work was to evaluate the progress of the areolate mildew of cotton under different soil cover and spacing conditions. The experiment was carried out using randomized blocks and a 2 × 3 factorial design, with two spacings (0.45 m and 0.90 m) and three soil covers (no cover, Pennisetum glaucum and Crotalaria spectabilis) with four replications. The plants were inoculated with R. areola, sixty DAS. A total of 14 evaluations of disease severity were performed. At the lower, middle and upper thirds of plants, a diagram scale with nine levels of severity was used and the resulting data were converted into the AUDPC. Gompertz, logistic, and monomolecular mathematical models were tested in the disease severity curves for each third. Agronomics characteristics were evaluated as well. Significant differences of AUDPC were found for the cotton plants thirds, and the middle third was the highest AUDPC. Significant difference for the lower and upper thirds, whose AUDPC were highest on 0.90 m spacing, was observed too. The disease progress curves of the thirds did not fit the tested models. Significant results to the both covers situations, where the treatments grown on crotalária cover and without cover had highest AUDPC, were evidenced. The treatments with C. spectabilis cover were taller than other treatments. Significant data were observed for the cover crops used and in the treatments grown at 0.90 m spacing, to residual cover and crop yield, respectively.

关键词： Pennisetum glaucum Crotalaria spectabilis Areolate Mildew High-Density Crops and No-Till

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