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| Michereff,Sami J; Noronha,Marissônia A; Lima,Gaus SA; Albert,Ígor CL; Melo,Edilaine A; Gusmão,Luciana O. |
| The downy mildew, caused by Pseudoperonospora cubensis, is an important melon disease in Northeast Brazil. Considering the lack of standard methods for its assessment, a diagrammatic scale was developed with 2, 4, 8, 16, 32, 64, 82, and 96% of affected leaf area. The scale was then checked for its accuracy, precision, and reproducibility in estimating downy mildew severity. The diagrammatic scale was validated by eight disease raters; using 50 leaves with different severity levels, previously measured using the software Assess®. Two evaluations were performed on the same set of leaves, but in a different sequence order, by the same raters, within a 15-day interval. The accuracy and precision of each rater was determined by simple linear regression between... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cucumis melo; Pseudoperonospora cubensis; Foliar disease; Epidemiology; Phytopatometry. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362009000100015 |
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| Sachet,Marcos Robson; Danner,Moeses Andrigo; Citadin,Idemir; Pertille,Rafael Henrique; Guerrezi,Marieli Teresinha. |
| ABSTRACT: The establishment of olive (Olea europaea) orchards in Brazil is increasing due to their economic potential and benefits to human health. However, a number of limiting factors need to be overcome, such as Olive Leaf Spot (OLS) occurrence, for olives to reach their full potential. OLS, which is caused by Fusicladium oleaginum, results in defoliation and a reduction in fruit production. This study aimed to develop a standard area diagram set (SAD) for the assessment of OLS severity under humid subtropical climate conditions. The SAD was developed with six levels of severity (1, 3, 6, 9, 12 and 15%) and OLS severity was validated by eight inexperienced raters. Using the SAD provided an increase in accuracy, precision and concordance, while also... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Olea europaea; Olive peacock’s eye; Phytopatometry. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000600153 |
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