tamanho de amostras para avaliação da severidade da queima das folhas do inhame sample size for assessment of yam leaf blight severity

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ID: 201367
2008
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Abstract
A queima das folhas, causada por Curvularia eragrostidis, é a principal doença foliar do inhame no Nordeste brasileiro. Para subsidiar a quantificação da doença no campo, foram determinados os tamanhos ideais das amostras em 15 plantios comerciais de inhame (cv. Da Costa) localizados na Zona da Mata de Pernambuco. Em cada plantio foram amostradas 100 plantas e a severidade da doença avaliada em extratos de 5, 15 e 30 folhas por planta. Os dados obtidos em cada área foram analisados pelo método que especifica o erro aceitável, determinado pelo coeficiente de variação da média. A severidade da doença variou entre 0,41 a 22,34% e foi correlacionada negativamente (P=0,05) com o tamanho da amostra. Na média dos plantios, o aumento da amostra de 15 para 30 folhas por planta propiciou pequena redução no número de plantas a ser avaliado, diferindo do observado quando o aumento foi de 5 para 15 folhas. Considerando os resultados obtidos e um erro aceitável de 10%, em futuros levantamentos da severidade da queima das folhas em plantios de inhame do Nordeste brasileiro recomenda-se a utilização de uma amostra de 37 plantas/ha e 15 folhas/planta.
Leaf blight, caused by Curvularia eragrostidis, is the major foliar disease of yam in the Brazilian Northeast. Optimum sample size were determined in 15 commercial yam (cv. Da Costa) areas, located at Zona da Mata, Pernambuco State, Northeast of Brazil, aiming to orientate the disease assessment of yam leaf blight in field conditions. Disease severity was assessed in 100 plants by field in extracts of 5, 15, and 30 leaves by plant. The data set from each area were analyzed by a method that specified the level of acceptable error, determined by the mean coefficient of variation. The disease severity ranged between 0.41 and 22.34% and was negatively correlated (P=0.05) with the sample size. The increase of 15 to 30 leaves sampled for plant result small reduction in the total number of plants to be sampled differing of the observed when the increase was from 5 to 15 leaves. Based on data set and considering 10% of acceptable error, future surveys of yam leaf blight severity in Northeast fields should analyze 37 plants/ha and 15 leaves/plant.
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michereff2008summatamanho Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Sami Jorge Michereff, Marissônia de Araújo Noronha, Luiz Antonio Maffia
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Journal research on chemical intermediates
Year 2008
DOI
10.1590/S0100-54052008000200018
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-54052008000200018
Keywords
sampling epidemiología

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