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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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| Noronha,Marissônia A; Michereff,Sami J; Xavier Filha,Maria S; Moreira,Priscilla A A; Reis,Ailton; Sales Júnior,Rui. |
| A expansão da cultura do meloeiro (Cucumis melo L.) no Nordeste brasileiro tem favorecido a ocorrência de doenças como o cancro-de-mirotécio, causado pelo fungo Myrothecium roridum. Visando selecionar genótipos com potencial de utilização nos programas de melhoramento e/ou no manejo integrado da doença, foram avaliados 150 genótipos de meloeiro. Plantas com 22 dias de idade, desenvolvidas em casa de vegetação, foram feridas no colo e inoculadas com uma suspensão do patógeno (3x10(6) conídios/ml). As avaliações foram realizadas diariamente, até seis dias após a retirada da câmara úmida, com o auxílio de uma escala descritiva de notas de 0 a 4. Com os dados da última avaliação, os genótipos foram distribuídos em cinco classes de reação à doença. Nenhum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cucumis melo; Cancro-de-mirotécio; Recursos genéticos. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362006000400020 |
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| Michereff,Sami J; Noronha,Marissônia A; Xavier Filha,Maria S; Câmara,Marcos PS; Reis,Ailton. |
| Brassicaceae family comprises plant species that are very important as vegetable crops, such as the species complex Brassica oleracea and Brassica rapa. Alternaria brassicicola and A. brassicae are among the most important pathogens of Brassicaceae causing Alternaria leaf spot disease. The occurrence and prevalence of Alternaria species causing leaf spots in brassica crops in Pernambuco was acessed, as well as the existence of a possible preference by vegetable host for these pathogens. Twenty-eight fields were surveyed in the Agreste region of Pernambuco state, in the 2005 and 2006 growing seasons. In each year, 10 Chinese cabbage, six cabbage, six cauliflower and six broccoli fields were visited. In each field, 50 leaves showing at least five lesions... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica oleracea; Brassica rapa; Alternaria brassicae; A. brassicicola; Etiology; Epidemiology. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362012000200027 |
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