Severidade de doenças e manutenção da área foliar verde em função da aplicação de micronutrientes e fungicidas em trigo

Lenz, Giuvan; Costa, Ivan Francisco Dressler da; Arrué, Adriano; Coradini, Cezar; Dressler, Valderi L.; Mello, Paola A.

doi:10.1590/s0100-54052011000200006

Cited by 12 publications

(14 citation statements)

References 7 publications

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“…Application of these compounds has resulted in higher yield response in wheat and barley, compared with other fungicides, when disease control was similar or in the absence of disease. This effect has been attributed to changes in the hormonal balance and other internal processes of plants exposed to strobilurins (Grossmann et al 1999;Venancio et al 2003), with resulting enhanced photosynthetic activity (Beck et al 2002), delayed leaf senescence (Grossmann et al 1999;Jabs et al 2002;Lenz et al 2011), improved nitrogen translocation (Ishikawa et al 2012), as well as increased tolerance of abiotic stress factors, such as drought (Grossmann et al 1999;Jabs et al 2002;Inagaki et al 2009). Further research is necessary, including fungicides with a different mode of action as that of pyraclostrobin, in order to determine the alleged yieldenhancing properties of this fungicide, as well as whether the presence or absence of pasmo disease influences the occurrence and severity of lodging in flax, regardless of the type of fungicide being used to control this disease.…”

Section: Effect Of Fungicide and N Rates On Seed Yieldmentioning

confidence: 99%

Pasmo disease and lodging in flax as affected by pyraclostrobin fungicide, N fertility and year

et al. 2014

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Vera, C. L., Irvine, R. B., Duguid, S. D., Rashid, K. Y., Clarke, F. R. and Slaski, J. J. 2014. Pasmo disease and lodging in flax as affected by pyraclostrobin fungicide, N fertility and year. Can. J. Plant Sci. 94: 119–126. Severe infection of the fungal disease known as pasmo, caused by Septoria linicola (Speg.) Garassini, reduces seed yield of flax (Linum usitatissimum L.) in western Canada. Pasmo may also indirectly affect seed yield by predisposing flax plants, under favorable weather and soil fertility conditions, to lodge. With the objective of studying the possible association of this disease with the occurrence of lodging and their effect on seed yield, a study was conducted at Melfort, Saskatchewan, Canada, during 4 consecutive years (2009, 2010, 2011 and 2012), with two fungicide regimes (application and no application) and five rates of nitrogen (N) fertilization (0, 33, 66, 100 and 133% of recommended). The application of pyraclostrobin fungicide reduced disease severity and increased seed yield of flax in the 3 yr (2010, 2011 and 2012) that pasmo infection was detected, and prevented or reduced the occurrence of lodging in the 2 yr (2010 and 2012) with favorable weather conditions for the occurrence of lodging. Increasing rates of N resulted in increased seed yield in 2009 and 2012, regardless of whether fungicide was used or not. Increasing rates of N also increased the severity of pasmo disease in 2010, 2011 and 2012, and of lodging severity in 2010 and 2012. The increase in disease severity due to N occurred in the absence of fungicide in 2011 and when fungicide was applied in 2012, while in 2010 just the effect of N on the two fungicide treatments combined was significant. Only low levels of disease severity (near 20%) were observed when fungicide was applied in 2011, while extreme disease severity (near 100%) occurred in 2012 at all levels of N when fungicide was not applied. The increase in lodging, as N rates increased, was observed only in the absence of fungicide, in both years. The occurrence of lodging took place late in the development of flax.

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Section: Effect Of Fungicide and N Rates On Seed Yieldmentioning

confidence: 99%

Pasmo disease and lodging in flax as affected by pyraclostrobin fungicide, N fertility and year

et al. 2014

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“…Barley diseases can be controlled by genetic resistance and management practices such as seed treatment, aerial fungicide application, seeding date and seeding rate, balanced fertility, weeds and volunteer crop-plant control and harvest management (MATRHE, 1997;KUMAR et al, 2002). Aerial fungicide applications have been one of the most important strategies in some countries, such as Brazil, to control most diseases in winter cereal crops (PICININI et al, 1996;LENZ et al, 2011).…”

Section: A Cevada (Hordeum Vulgaris L) é a Segunda Mais Importante Cmentioning

confidence: 99%

Critical yield-point model to estimate damage caused by brown spot and powdery mildew in barley

Agostinetto¹,

Casa²,

Bogo³

et al. 2014

Cienc. Rural

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Barley (Hordeum vulgaris L.) is the second most important winter crop in Southern Brazil. The excessive rainfall in this region during the crop-growing season increases the frequency and intensity of foliar fungal diseases. The research aimed to determine the damage function equations (DFE 219.5 to 6,276.6 (2009) and 102.3 to 5,292.5kg ha -1 (2010) RESUMO A cevada (Hordeum vulgaris L.) é a segunda mais importante cultura de inverno no Sul do Brasil. Nessa região, o excesso de chuvas durante a estação de crescimento da cultura favorece o aumento na frequência e intensidade de doenças foliares. O trabalho objetivou determinar as equações de função de dano (EFD) para o patossistema múltiplo mancha-marrom e oídio da cevada pela relação entre rendimento de grãos e intensidade foliar das doenças em diferentes estádios fenológicos da cultivar de cevada 'BRS

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“…A eficiência deste fungicida já foi comprovado por Lenz et al (2011), quem encontraram que a mistura de fungicida epoxiconazol + piraclostrobina proporcionam o melhor controle de D. tritici-repentis e S. tritici. Os mesmos autores relatam que os fungicidas epoxiconazol + piraclostrobina, piraclostrobina e epoxiconazol quando aplicados associados ou não a micronutrientes, via foliar, propiciaram aumento do peso hectolítrico, peso de mil grãos e rendimento, quando comparados à testemunha.…”

Section: Materiais E Métodosunclassified

Fungicides efficiency on wheat diseases control in response to the application with different spray nozzles

et al. 2011

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Recibido 07 septiembre 2011; aceptado 04 octubre 2011 ResumenEl objetivo fue evaluar la eficiencia de fungicidas en el control de las enfermedades foliares del cultivo de trigo, cuando aplicados con diferentes modelos de boquillas de pulverización. El experimento fue realizado en un delineamiento de bloques al azar, con cuatro repeticiones con arreglo factorial (4 x 3) + 1. Los datos fueron sometidos al análisis de varianza y las medias comparadas por el test de Tukey al 5% de probabilidad del error. Los fungicidas utilizados fueron: Opera® (piraclostrobina + epoxiconazol) 0.75 L.ha. Estos fungicidas fueron aplicados con tres modelos de boquillas de pulverización de chorros planos: XR 11001 (gota fina), AIRMIX 11001 (gota media) e AVI 11001 (gota gruesa). Fueron evaluadas la incidencia y severidad (número de lesiones por hoja) de mancha amarilla (Drechslera tritici-repentis), mancha marrón (Bipolaris sorokiniana), roya de la hoja (Puccinia triticina) y el rendimiento de granos (kg.ha -1 ) del cultivo. Los resultados obtenidos muestran que la aplicación de fungicidas para el control de enfermedades foliares en trigo resultó en aumento en el rendimiento de granos, siendo que mayores valores de rendimiento fueron observados con la aplicación de Opera®, utilizando la punta XR 11001. Palabras clave: Triticum aestivum, manchas foliares, roya, tecnología de aplicación. ResumoEste estudo teve como objetivo avaliar a eficiência de fungicidas no controle de doenças foliares da cultura de trigo, quando aplicados com diferentes modelos de pontas de pulverização. O experimento foi conduzido em delineamento de blocos ao acaso, com quatro repetições com esquema fatorial (4 x 3) + 1. Os dados foram submetidos à análise de variância e as médias comparadas pelo teste de Tukey a 5% de probabilidade de erro. Os fungicidas utilizados foram: Opera® (piraclostrobina + epoxiconazol) 0.75 L.ha. Estes fungicidas foram aplicados com três modelos de pontas de pulverização de jatos planos: XR 11001 (gota fina), AIRMIX 11001 (gota média) e AVI 11001 (gota grossa). Foram avaliadas a incidência e severidade (número de lesões por folha) de mancha amarela (Drechslera triticirepentis), mancha marrom (Bipolaris sorokiniana), ferrugem da folha (Puccinia triticina) e o rendimento de grãos (kg.ha -1 ) da cultura. Os resultados obtidos mostram que a aplicação de fungicidas para o controle das doenças foliares em trigo resultou em acréscimos no rendimento de grãos, sendo que maiores valores de rendimento foram observados com a aplicação de Opera®, utilizando a ponta XR 11001. Palavras-chave: Triticum aestivum, manchas foliares, ferrugem, tecnologia de aplicação. AbstractThis study aimed to evaluate the efficiency of fungicides to leaf control diseases of wheat, when applied to different models of spray nozzles. The experiment was conducted in a randomized block design with four Scientia Agropecuaria

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Severidade de doenças e manutenção da área foliar verde em função da aplicação de micronutrientes e fungicidas em trigo

Cited by 12 publications

References 7 publications

Pasmo disease and lodging in flax as affected by pyraclostrobin fungicide, N fertility and year

Pasmo disease and lodging in flax as affected by pyraclostrobin fungicide, N fertility and year

Critical yield-point model to estimate damage caused by brown spot and powdery mildew in barley

Fungicides efficiency on wheat diseases control in response to the application with different spray nozzles

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