Web blight of common bean-epidemiology and fungicide application
The progress of web blight (Thanatephorus cucumeris) epidemic in common beans (Phaseolus vulgaris L.), in relation to number and timing of different fungicidal sprays was studied in three field experiments conducted in Transamazon region. The disease increased at the rate of 0.29 unit per day in untreated plots under favorable conditions. The systemic fungicides benomyl and oxycarboxin were more efficient in reducing she infection rate than protectants such as mancozeb and copper oxychloride. Increase in number of sprays with systemic fungicides proportionately delayed the onset of epidemic. Early sprays in the vegetative growth stage of bean crop were more effective in slowing the rate and delay the disease onset. The results further showed that the leaf lesion size increased in accordance with the exponential law.
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Pesquisa Agropecuaria Brasileira
2014
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rev-pab-br-article-154932014-04-16T18:50:16Z Web blight of common bean-epidemiology and fungicide application Murcha da teia micélica do feijoeiro comum epidemiologia e aplicação de fungicidas Prabhu, Anne Sitarama Silva, José Francisco de Assis F. da Correa, João Roberto Viana Polaro, Raimundo Humberto Lima, Emídio Ferreira Rhizoctonia microsclerotia; Phaseolus vulgaris; chemical control; timing of sprays; systemic fungicides mela; Rhizoctonia microsclerotia; Phaseolus vulgaris; controle químico; época de pulverização; fungicidas sistêmicos; Thanatephorus cucumeris The progress of web blight (Thanatephorus cucumeris) epidemic in common beans (Phaseolus vulgaris L.), in relation to number and timing of different fungicidal sprays was studied in three field experiments conducted in Transamazon region. The disease increased at the rate of 0.29 unit per day in untreated plots under favorable conditions. The systemic fungicides benomyl and oxycarboxin were more efficient in reducing she infection rate than protectants such as mancozeb and copper oxychloride. Increase in number of sprays with systemic fungicides proportionately delayed the onset of epidemic. Early sprays in the vegetative growth stage of bean crop were more effective in slowing the rate and delay the disease onset. The results further showed that the leaf lesion size increased in accordance with the exponential law. O progresso da murcha da teia micélica (Thanatephorus cucumeris) do feijoeiro comum (Phaseolus vulgaris L.), em relação ao número e à época de aplicação de diferentes fungicidas, foi estudado em três experimentos de campo na região da Transamazônica. A doença aumentou à taxa de 0,29 unidade por dia em parcelas não-tratadas, em condições favoráveis. Os fungicidas sistêmicos, benomil e oxicarboxin, foram mais eficientes na redução da taxa de infecção do que os protetores, mancozeb e oxicloreto de cobre. O aumento do número de aplicações de fungicidas sistêmicos atrasou o início da epidemia. As pulverizações feitas mais cedo, na fase vegetativa do feijoeiro, reduziram melhor a taxa de infecção e atrasaram mais o início da doença. Os resultados demonstraram, ainda, que o tamanho de lesão individual na folha aumentou de maneira exponencial. Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira 2014-04-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://seer.sct.embrapa.br/index.php/pab/article/view/15493 Pesquisa Agropecuaria Brasileira; v.18, n.12, dez. 1983; 1323-1332 Pesquisa Agropecuária Brasileira; v.18, n.12, dez. 1983; 1323-1332 1678-3921 0100-104x por https://seer.sct.embrapa.br/index.php/pab/article/view/15493/9440 |
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Prabhu, Anne Sitarama Silva, José Francisco de Assis F. da Correa, João Roberto Viana Polaro, Raimundo Humberto Lima, Emídio Ferreira |
| spellingShingle |
Prabhu, Anne Sitarama Silva, José Francisco de Assis F. da Correa, João Roberto Viana Polaro, Raimundo Humberto Lima, Emídio Ferreira Web blight of common bean-epidemiology and fungicide application |
| author_facet |
Prabhu, Anne Sitarama Silva, José Francisco de Assis F. da Correa, João Roberto Viana Polaro, Raimundo Humberto Lima, Emídio Ferreira |
| author_sort |
Prabhu, Anne Sitarama |
| title |
Web blight of common bean-epidemiology and fungicide application |
| title_short |
Web blight of common bean-epidemiology and fungicide application |
| title_full |
Web blight of common bean-epidemiology and fungicide application |
| title_fullStr |
Web blight of common bean-epidemiology and fungicide application |
| title_full_unstemmed |
Web blight of common bean-epidemiology and fungicide application |
| title_sort |
web blight of common bean-epidemiology and fungicide application |
| description |
The progress of web blight (Thanatephorus cucumeris) epidemic in common beans (Phaseolus vulgaris L.), in relation to number and timing of different fungicidal sprays was studied in three field experiments conducted in Transamazon region. The disease increased at the rate of 0.29 unit per day in untreated plots under favorable conditions. The systemic fungicides benomyl and oxycarboxin were more efficient in reducing she infection rate than protectants such as mancozeb and copper oxychloride. Increase in number of sprays with systemic fungicides proportionately delayed the onset of epidemic. Early sprays in the vegetative growth stage of bean crop were more effective in slowing the rate and delay the disease onset. The results further showed that the leaf lesion size increased in accordance with the exponential law. |
| publisher |
Pesquisa Agropecuaria Brasileira |
| publishDate |
2014 |
| url |
https://seer.sct.embrapa.br/index.php/pab/article/view/15493 |
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