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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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| Souza,Leonardo T; Michereff,Sami J; Laranjeira,Delson; Andrade,Domingos EGT; Ferraz,Edinardo; Lima,Gaus SA; Reis,Ailton. |
| A murcha-de-fusário, causada por Fusarium oxysporum f. sp. lycopersici, é uma importante doença do tomateiro (Solanum lycopersicon L.) no Nordeste brasileiro. Visando selecionar genótipos com potencial de utilização no manejo da doença, foram avaliadas 60 linhagens (geração F7) oriundas do cruzamento entre o acesso BHRS-2,3 e a cultivar Viradoro, em relação a isolados das raças fisiológicas 2 e 3 de F. oxysporum f. sp. lycopersici. Os isolados foram inoculados em mudas com 21 dias de idade pelo método do corte de raízes e imersão na suspensão de conídios do patógeno. A avaliação foi realizada após 21 dias, com o auxílio de escala de notas de 1 a 5, para agrupamento dos genótipos em cinco classes de reação. A maioria dos genótipos (73,3%) se comportou como... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum lycopersicon; Murcha-de-fusário; Resistência genética. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362010000100019 |
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| Assunção,Iraildes P; Nascimento,Liliane D; Ferreira,Mércia F; Oliveira,Francisco J; Michereff,Sami J; Lima,Gaus SA. |
| The production of faba bean (Phaseolus lunatus) is limited due to the occurrence of Rhizoctonia canker, caused by the fungus Rhizoctonia solani. In order to select materials with potential for use in faba beans breeding programs and/or disease integrated management, 72 genotypes were evaluated and also stability of the disease resistance in relation to different pathogen isolates, inoculum densities and soil type. The seeds were sown in soil infested with the pathogen by the addition of colonized substrate (rice grains). The evaluation of genotypes was done after 15 days, using a note scale to discriminate the genotypes into five reaction classes. None of the 72 genotypes showed immunity to R. solani and only four genotypes (F-42, F-49, F-53 and F-58)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus lunatus; Rhizoctonia canker; Genetic resistance. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362011000400008 |
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