Silicato de potássio, acibenzolar-S-metil e fungicidas no controle da ferrugem da soja

Duarte, Henrique da Silva Silveira; Zambolim, Laércio; Rodrigues, Fabrício Á.; Rios, Jonas Alberto; Lopes, Ueder Pedro

doi:10.1590/s0103-84782009000800001

Cited by 14 publications

(20 citation statements)

References 14 publications

(3 reference statements)

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“…In addition, fewer and smaller sized uredia compared to those obtained on leaves from the control treatment may be related to a reduced production of urediniospores. In contrast to the results of this experiment, Duarte et al (2009) found that in the field, PS rates were not effective in reducing the symptoms of ASR compared with fungicide application. In fact, the efficiency of the use of the PS seems to be closely related to the climatic conditions of the study area and the time of application of the product in relation to the quantity and availability of inoculum present in the area.…”

contrasting

confidence: 99%

Potassium silicate and calcium silicate on the resistance of soybean to Phakopsora pachyrhizi infection

Cruz

Rodrigues²,

Diniz³

et al. 2013

Bragantia

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The control of Asian Soybean Rust (ASR), caused by Phakopsora pachyrhizi, has been difficult due to the aggressiveness of the pathogen and the lack of resistant cultivars. The objective of this study was to evaluate the effects of spray of potassium silicate (PS) and soil amendment with calcium silicate (CS) on soybean resistance to ASR. The PS solution was sprayed to leaves 24 hours prior to fungal inoculation while CS was amended to the soil at thirty-five days before sowing. The infection process of P. pachyrhizi was investigated by scanning electron microscopy. The uredia on leaves of plants sprayed with PS were smaller and more compact than those observed on the leaves of plants grown in soil amended with CS or in soil non-amended with CS (control treatment). On leaves of plants from the control treatment, uredia produced many urediniospores at 9 days after inoculation, and the ASR severity was 15, 8 and 9%, respectively, for plants from control, PS and CS treatments. In conclusion, the spray of PS contributed to reduce the number of uredia per cm² of leaf area and both PS spray and CS resulted in lower ASR symptoms.Key words: Glycine max, biotrophic fungi, scanning electron microscopy.Silicato de potássio e silicato de cálcio na resistência da soja à infecção por Phakopsora pachyrhizi Resumo O controle da Ferrugem Asiática da Soja (FAS), causado pelo fungo Phakopsora pachyrhizi, tem sido difícil devido à agressividade do patógeno e pela falta de cultivares resistentes. O objetivo deste estudo foi avaliar os efeitos da pulverização com silicato de potássio (SP) e do suprimento de Si via silicato de cálcio (SC) no solo sobre a resistência da soja à FAS. A solução de PS foi pulverizada nas folhas 24 horas antes da inoculação, enquanto que o SC foi aplicado no solo 35 dias antes da semeadura. O processo infeccioso de P. pachyrhizi foi investigado por microscopia eletrônica de varredura. As urédias nas folhas das plantas pulverizadas com SP foram menores e mais compactas do que as observadas nas folhas das plantas cultivadas em solo contendo SC ou em solo não contendo SC (tratamento controle). Nas folhas das plantas do tratamento controle, as urédias produziram muitos uredosporos aos nove dias após inoculação e a severidade da FAS foi de 15, 8 e 9% para as plantas dos tratamentos controle, SP e SC, respectivamente. Em conclusão, a pulverização de SP contribuiu para reduzir o número de urédias cm -2 da área foliar e ambas, a pulverização com SP e a aplicação do SC, resultaram na redução dos sintomas da FAS.Palavras-chave: Glycine max, fungo biotrófico, microscopia eletrônica de varredura.

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contrasting

confidence: 99%

Potassium silicate and calcium silicate on the resistance of soybean to Phakopsora pachyrhizi infection

Cruz

Rodrigues²,

Diniz³

et al. 2013

Bragantia

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“…Moreover, photosynthesis was preserved at the photosynthetic machinery level coupled with lower destruction of photosynthetic pigments and greater leaf gas exchange capacity of the infected plants. It is known that both Epo+Pyr and ASM can decrease ASR severity as well as the number of pustules per leaf (Cruz et al., ; Duarte et al., ; Miles et al., ; Rodrigues et al., ). The QoI fungicides affect both spore germination and fungal penetration into the host′s tissues and these are both detrimental against fungal infection (Bartlett et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…Application of foliar fungicides, particularly quinone outside and demethylation inhibitors (QoIs and DMIs), has been recommended for minimizing the losses caused by ASR (Langenbach, Campe, Beyer, Mueller, & Conrath, 2016). Additionally, the use of inducers of resistance such as the Acibenzolar-S-Methyl (ASM), an analogue of the salicylic acid, could be an alternative for ASR management (Cruz, Rodrigues, Diniz, Moreira, & Barros, 2014;Cruz et al, 2013;Dallagnol, Navarini, Ugalde, Balardin, & Catellam, 2006;Duarte, Zambolim, Rodrigues, Rios, & Lopes, 2009;Rodrigues et al, 2009).…”

mentioning

confidence: 99%

Leaf gas exchange and chlorophyll a fluorescence in soybean leaves infected by Phakopsora pachyrhizi

Rios

Aucique‐Pérez

et al. 2017

Journal of Phytopathology

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Asian soybean rust (ASR), caused by Phakopsora pachyrhizi, is one of the most important foliar diseases affecting soybean production worldwide. This study aimed to investigate the photosynthetic performance (leaf gas exchange, chlorophyll (Chl) a fluorescence images and photosynthetic pigment pools) of soybean plants sprayed with Acibenzolar‐S‐Methyl (ASM) and the fungicide epoxiconazole + pyraclostrobin (Epo+Pyr) and further inoculated with P. pachyrhizi. The ASR symptoms progressed much faster on the leaves of plants from the control treatment (water spray) in comparison with the ASM and Epo+Pyr treatments. In general, the values for the leaf gas exchange parameters net carbon assimilation rate (A), stomatal conductance to water vapour (gs), internal CO2 concentration (Ci) and transpiration rate (E) increased for the infected plants sprayed with ASM or Epo+Pyr in comparison with plants from the control treatment. The values for the initial fluorescence (Fo), maximal fluorescence (Fm), maximal photosystem II quantum efficiency (Fv/Fm), effective photosystem II quantum yield (Y(II)) and quantum yield of regulated energy dissipation (Y(NPQ)) were consistently higher for the ASM and Epo+Pyr treatments in comparison with the control treatment at advanced stages of fungal infection. By contrast, the values for quantum yield of non‐regulated energy dissipation (Y(NO) were significantly lower for the ASM and Epo+Pyr treatments. The concentrations of total Chl a+b and carotenoids significantly increased for infected plants sprayed with ASM and Epo+Pyr in comparison with plants from the control treatment. The results of this study demonstrated that the spray of soybean plants with either ASM or Epo+Pyr contributed to reduce the negative effect of ASR on the photosynthesis of soybean plants.

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“…Pereira et al (2009) reported a reduction in the severity of coffee leaf rust with foliar application of potassium silicate, but there was no increase in the activities of chitinase, ß-1,3-glucanases, peroxidases, polyphenol oxidases, phenylalanine ammonialyases and lipoxygenases. Duarte et al (2009) did not find significant effect of potassium silicate on the reduction of area under the soybean rust progress curve as well as yield. When the fungicide mancozeb was mixed with potassium silicate at 1.2 kg/ha, the progress of soybean rust was not affected.…”

Section: Rust Caused By the Fungus Hemileia Vastatrixmentioning

confidence: 61%

Effect of foliar application of potassium silicate on the progress of coffee leaf rust

Lopes¹,

Zambolim²,

Neto³

et al. 2013

Trop. plant pathol.

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In order to evaluate the effect of potassium silicate spray on the control of coffee leaf rust and coffee yield, an experiment was conducted during the 2005/2006 and 2006/2007 growing seasons on Coffea arabica cv. Catuaí Vermelho IAC 144, in a location situated at an elevation of 850 m in Coimbra, Minas Gerais, Brazil. The treatments consisted of: 1 -potassium silicate; 2 -potassium silicate + copper hydroxide; 3 -copper hydroxide; 4 -epoxiconazole formulated with pyraclostrobin and 5 -control treatment. Six applications of potassium silicate and copper hydroxide were made twice per month from December to March of each year. Two applications of the systemic fungicide were done in December and March of each year. Potassium silicate alone or in combination with copper hydroxide was not efficient in reducing coffee leaf rust incidence and increasing yield under high incidence of coffee leaf rust.

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Silicato de potássio, acibenzolar-S-metil e fungicidas no controle da ferrugem da soja

Abstract: Silicato de potássio, acibenzolar-S-metil e fungicidas no controle da ferrugem da soja.

Cited by 14 publications

References 14 publications

Potassium silicate and calcium silicate on the resistance of soybean to Phakopsora pachyrhizi infection

Potassium silicate and calcium silicate on the resistance of soybean to Phakopsora pachyrhizi infection

Leaf gas exchange and chlorophyll a fluorescence in soybean leaves infected by Phakopsora pachyrhizi

Effect of foliar application of potassium silicate on the progress of coffee leaf rust

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