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Registro Completo |
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
13/07/2011 |
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Data da última atualização: |
19/07/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
RODRIGUES, F. A.; DUARTE, H. S. S.; REZENDE, D. C.; WORDELL FILHO, J. A.; ZAMBOLIM, L. |
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Afiliação: |
Epagri |
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Título: |
Foliar spray of potassium silicate on the control of leaf spot on beans. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Journal of Plant Nutrition, v. 33, n. 14, p. 2082-2093, 2010. |
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Idioma: |
Inglês |
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Notas: |
ISSN, 01904167 |
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Conteúdo: |
This study aimed to determine if potassium silicate (KSi) sprays could reduce the intensity of angular leaf spot. In field experiment 1, bean plants were sprayed with KSi (pH 10.5) at rates of 8, 20, 40, and 60 g L−1. In field experiment 2, with the same treatments, the pH of the KSi solutions was 5.5. In experiment 3, the treatments were KSi (40 g L−1, pH 5.5), potassium hydroxide (KOH) (6.5 g L−1, pH 5.5), tebuconazole (0.5 L ha−1), and control. In experiment 4, the treatments were the same as in experiment 3, but the pH of the KSi and KOH solutions was 10.5. Plants sprayed with water served as a control treatment for all field experiments. Plants were artificially
inoculated with Pseudocercopora griseola before products application. For experiments 3 and 4, the treatment with KOH was included to equalize the amount of potassium (K) with the treatment corresponding to the application of KSi. Disease severity was evaluated using a scale with values ranging from 0.2 to 30.4% at 85 days after seedling emergence. Plant defoliation, Si, and K concentration in the plant tissues, and yield were also determined. There was no relationship between KSi rates and Si concentration in leaf tissues, but Si concentration increased by 58 and 57%, respectively, as the KSi rates increased from 0 to 60 g L−1 regardless of the pH. The K concentration
in leaf tissues did not change among the treatments. Disease severity decreased by 42 and 30%, respectively, at the highest KSi rate with pH 5.5 and pH 10.5 over the control. Disease severity levels were similar between the KSi and KOH treatments, but they were significantly higher compared to the tebuconazole. Plant defoliation at the highest KSi rate with pH 5.5 and 10.5 was 17 and 33%, respectively, less than the control. Plant defoliation decreased with the application of KSi with pH 5.5 and 10.5 in 29 and 34%, respectively, compared to the control. Yield increased by 30 and 43%, respectively, as the KSi rates increased from 0 to 60 g L−1with pH 5.5 and 10.5. No statistical difference in yield was detected between the KSi and KOH treatments regardless of
the pH used, but both were different from tebuconazole. Significant differences in yield were found only between tebuconazole and the control. Results from this study suggest that foliar application of KSi and KOH has the potential to reduce angular leaf spot severity. The KSi did not offer any advantage over the KOH spray, suggesting a lack of a direct effect of Si accumulated in the leaf tissue on disease control. MenosThis study aimed to determine if potassium silicate (KSi) sprays could reduce the intensity of angular leaf spot. In field experiment 1, bean plants were sprayed with KSi (pH 10.5) at rates of 8, 20, 40, and 60 g L−1. In field experiment 2, with the same treatments, the pH of the KSi solutions was 5.5. In experiment 3, the treatments were KSi (40 g L−1, pH 5.5), potassium hydroxide (KOH) (6.5 g L−1, pH 5.5), tebuconazole (0.5 L ha−1), and control. In experiment 4, the treatments were the same as in experiment 3, but the pH of the KSi and KOH solutions was 10.5. Plants sprayed with water served as a control treatment for all field experiments. Plants were artificially
inoculated with Pseudocercopora griseola before products application. For experiments 3 and 4, the treatment with KOH was included to equalize the amount of potassium (K) with the treatment corresponding to the application of KSi. Disease severity was evaluated using a scale with values ranging from 0.2 to 30.4% at 85 days after seedling emergence. Plant defoliation, Si, and K concentration in the plant tissues, and yield were also determined. There was no relationship between KSi rates and Si concentration in leaf tissues, but Si concentration increased by 58 and 57%, respectively, as the KSi rates increased from 0 to 60 g L−1 regardless of the pH. The K concentration
in leaf tissues did not change among the treatments. Disease severity decreased by 42 and 30%, respectively, at the... Mostrar Tudo |
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Palavras-Chave: |
Disease control; Foliar disease; Phaseolus vulgaris L; Silicon. |
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Categoria do assunto: |
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Marc: |
LEADER 03083naa a2200181 a 4500
001 1078309
005 2011-07-19
008 2010 bl uuuu u00u1 u #d
100 1 $aEpagri
245 $aFoliar spray of potassium silicate on the control of leaf spot on beans.
260 $c2010
500 $aISSN, 01904167
520 $aThis study aimed to determine if potassium silicate (KSi) sprays could reduce the intensity of angular leaf spot. In field experiment 1, bean plants were sprayed with KSi (pH 10.5) at rates of 8, 20, 40, and 60 g L−1. In field experiment 2, with the same treatments, the pH of the KSi solutions was 5.5. In experiment 3, the treatments were KSi (40 g L−1, pH 5.5), potassium hydroxide (KOH) (6.5 g L−1, pH 5.5), tebuconazole (0.5 L ha−1), and control. In experiment 4, the treatments were the same as in experiment 3, but the pH of the KSi and KOH solutions was 10.5. Plants sprayed with water served as a control treatment for all field experiments. Plants were artificially inoculated with Pseudocercopora griseola before products application. For experiments 3 and 4, the treatment with KOH was included to equalize the amount of potassium (K) with the treatment corresponding to the application of KSi. Disease severity was evaluated using a scale with values ranging from 0.2 to 30.4% at 85 days after seedling emergence. Plant defoliation, Si, and K concentration in the plant tissues, and yield were also determined. There was no relationship between KSi rates and Si concentration in leaf tissues, but Si concentration increased by 58 and 57%, respectively, as the KSi rates increased from 0 to 60 g L−1 regardless of the pH. The K concentration in leaf tissues did not change among the treatments. Disease severity decreased by 42 and 30%, respectively, at the highest KSi rate with pH 5.5 and pH 10.5 over the control. Disease severity levels were similar between the KSi and KOH treatments, but they were significantly higher compared to the tebuconazole. Plant defoliation at the highest KSi rate with pH 5.5 and 10.5 was 17 and 33%, respectively, less than the control. Plant defoliation decreased with the application of KSi with pH 5.5 and 10.5 in 29 and 34%, respectively, compared to the control. Yield increased by 30 and 43%, respectively, as the KSi rates increased from 0 to 60 g L−1with pH 5.5 and 10.5. No statistical difference in yield was detected between the KSi and KOH treatments regardless of the pH used, but both were different from tebuconazole. Significant differences in yield were found only between tebuconazole and the control. Results from this study suggest that foliar application of KSi and KOH has the potential to reduce angular leaf spot severity. The KSi did not offer any advantage over the KOH spray, suggesting a lack of a direct effect of Si accumulated in the leaf tissue on disease control.
653 $aDisease control
653 $aFoliar disease
653 $aPhaseolus vulgaris L
653 $aSilicon
773 $tJournal of Plant Nutrition$gv. 33, n. 14, p. 2082-2093, 2010.
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Epagri-Sede (Epagri-Sede) |
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
16/01/2019 |
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Data da última atualização: |
16/01/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - B |
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Autoria: |
ARAÚJO, E. R.; RESENDE, R. S.; KREZANOSKI, C. E.; DUARTE, H. S. S. |
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Título: |
A standard area diagram set for severity assessment of botrytis leaf blight of onion. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
European Journal of Plant Pathology, Amsterdan, v. 153, n. 1, p. 283-287, 2018. |
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Idioma: |
Inglês |
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Conteúdo: |
This work aimed to develop and validate a standard area diagram set (SADs) to estimate the severity of botrytis leaf blight of onion caused by Botrytis squamosa. For this purpose, a SADs with nine levels of severity (0.3; 1.0; 2.5; 5.0; 10; 20; 30; 40; and 57.7%) was developed from 193 symptomatic leaves collected in the field. The SADs was validated by 16 raters with no experience in evaluating plant diseases. Both precision and accuracy improved when they used the SADs. The statistical parameters for the 16 raters were: coefficient of bias - Cb (no SADs = 0.592, with SADs = 0.988); correlation coefficient ? r (no SADs = 0.864, with SADs = 0.921); and Lin?s concordance correlation coefficient ? ρc (no SADs = 0.513, with SADs = 0.909). In addition, estimates were more reliable: coefficient of determination - R2 (no SADs = 0.681, with SAD = 0.796); intra-class correlation coefficient - ρ (no SADs = 0.729, with SADs = 0.876). The SADs proposed here is a useful tool for improving visual assessments of severity of botrytis leaf blight of onion. |
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Palavras-Chave: |
Allium cepa; Botrytis squamosa; Disease assessment; Phytopathometry. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 01825naa a2200205 a 4500
001 1128242
005 2019-01-16
008 2018 bl uuuu u00u1 u #d
100 1 $aARAÚJO, E. R.
245 $aA standard area diagram set for severity assessment of botrytis leaf blight of onion.$h[electronic resource]
260 $c2018
520 $aThis work aimed to develop and validate a standard area diagram set (SADs) to estimate the severity of botrytis leaf blight of onion caused by Botrytis squamosa. For this purpose, a SADs with nine levels of severity (0.3; 1.0; 2.5; 5.0; 10; 20; 30; 40; and 57.7%) was developed from 193 symptomatic leaves collected in the field. The SADs was validated by 16 raters with no experience in evaluating plant diseases. Both precision and accuracy improved when they used the SADs. The statistical parameters for the 16 raters were: coefficient of bias - Cb (no SADs = 0.592, with SADs = 0.988); correlation coefficient ? r (no SADs = 0.864, with SADs = 0.921); and Lin?s concordance correlation coefficient ? ρc (no SADs = 0.513, with SADs = 0.909). In addition, estimates were more reliable: coefficient of determination - R2 (no SADs = 0.681, with SAD = 0.796); intra-class correlation coefficient - ρ (no SADs = 0.729, with SADs = 0.876). The SADs proposed here is a useful tool for improving visual assessments of severity of botrytis leaf blight of onion.
653 $aAllium cepa
653 $aBotrytis squamosa
653 $aDisease assessment
653 $aPhytopathometry
700 1 $aRESENDE, R. S.
700 1 $aKREZANOSKI, C. E.
700 1 $aDUARTE, H. S. S.
773 $tEuropean Journal of Plant Pathology, Amsterdan$gv. 153, n. 1, p. 283-287, 2018.
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