Critical-point models to relate yield and disease intensity of the multiple pathosystem in rice leaf spots disease

Bordin, Luiz Carlos; Casa, Ricardo Trezzi; Marcuzzo, Leandro Luiz; Reis, Erlei Melo; Gheller, A.C .; Zancan, Rômulo Luís; Fingstag, Maiquiel Diego

doi:10.1590/0103-8478cr20150310

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…The absence of fungicides caused a decrease in vitreous grains with increasing N doses, with the lowest value of 37% at the doses of 120 and 180 kg ha -1 N. When fungicides were applied to the rice plants, higher percentages of milling yield and of whole and vitreous grains were obtained with constant values, regardless of the use of K silicate. Bordin et al (2016), while evaluating the application of fungicides at different phenological stages of irrigated rice cultivars, reported that, when the disease was less severe, there was a higher percentage of milling yield and whole grains.…”

Section: Resultsmentioning

confidence: 99%

Occurrence of rice blast on and grain quality of irrigated rice fertilized with nitrogen and silicates

Oliveira

Marchesan

David

et al. 2019

Pesq. agropec. bras.

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How to cite OLIVEIRA, L.M. de; MARCHESAN, E.; DAVID, R. de; WERLE, I.S.; ARAMBURU, B.B.; DONATO, G.; SILVA, A.L da; COSTA, I.F.D. da. Occurrence of rice blast on and grain quality of irrigated rice fertilized with nitrogen and silicates.Abstract -The objective of this work was to evaluate the effects of fertilization with nitrogen topdressing and silicates, as well as of the use of fungicides, on the occurrence of rice blast on panicles, milling yield, and whole grains, vitreous grains, and chalky kernels in a flood-irrigated rice cultivar sensitive to the disease. Two experiments were conducted in a randomized complete block design, in a 4×4×2 factorial arrangement, with four replicates: in experiment 1, four doses of nitrogen × four doses of calcium and magnesium silicate on soil × with and without fungicides; and, in experiment 2, four doses of nitrogen × four doses of potassium silicate applied on leaves x with and without fungicides. At the doses above 60 kg ha -1 nitrogen without fungicides, there was an increase of rice blast severity on panicles, a decrease in the percentage of whole and vitreous grains, and an increase in chalky kernels and chalky area. The greatest effects of silicates occurred without fungicides. Fungicide use reduced the severity of rice blast on panicles. Milling yield ranged from 60 to 70% in both experiments. The control of rice blast with fungicides maintains high rice grain quality, milling yield, and percentages of whole and vitreous grains.

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Section: Resultsmentioning

confidence: 99%

Occurrence of rice blast on and grain quality of irrigated rice fertilized with nitrogen and silicates

Oliveira

Marchesan

David

et al. 2019

Pesq. agropec. bras.

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“…Resultados similares fueron reportados por Aguilar-Anccota et al (2018), los cuales identificaron síntomas de severidad como lesiones necróticas de coloración marrón oscura en panículas y tallos a una edad aproximada de 60 días, así como un incremento de los síntomas en los muestreos posteriores. Se ha reportado que las manchas en hojas causadas por fitopatógenos pueden causar daños por encima del 50 % al disminuir la calidad del grano, existe correlación entre la severidad de las enfermedades foliares y el rendimiento de grano (Bordin et al, 2016b). Otros autores encontraron severidad menor del 4 % en hojas de plantas de arroz durante la etapa vegetativa y que el grado de infección varía dependiendo de las variables utilizadas, sin embargo, la severidad puede aumentar del 4 % hasta el 28 % en la etapa reproductiva ya que la planta es más susceptible al daño por fitopatógenos al utilizar los nutrientes adquiridos para la formación de granos (Cárdenas et al, 2007).…”

Section: Líneas De Arrozunclassified

Incidencia Y Severidad Del Daño Por Hongos en Líneas De Arroz Sometidas a Dosis De Fertilización

Martínez Bautista,

Osorio Hernández,

Patishtan

et al. 2023

Trop Subtrop Agroecosyst

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Background: In Mexico, rice crop production is limited by phytopathogenic fungi that cause diseases, some of which increase their incidence and severity when conditions such as high humidity and nutrient deficiency or excess occur. Objective: Determine the incidence and severity of the damage caused by phytopathogenic fungi in rice lines subjected to conditions of 100 % and 10 % nitrogen and phosphorous fertilization. Methodology: The experiment was carried out in the spring-summer 2021 cycle, at the Ébano-INIFAP Experimental Site, 136 rice lines were used and two treatments (100 % and 10 % nitrogenous and phosphorous chemical fertilization), were morphologically identified. phytopathogenic fungi and the incidence, severity, plant height and fresh biomass were measured. Results: Higher incidence and severity (27.5 % and <4 % respectively) were obtained in the rice lines subjected to the 10 % nitrogenous and phosphorous fertilization treatment. In both treatments Chiclayo 61 was identified as tolerant to damage from Alternaria sp., Curvularia geniculata and Fusarium equiseti, presenting incidence and severity of symptoms between 3.3 to 36.7 % and <1.5 %, respectively. On the other hand, plant height and fresh biomass showed higher values in the treatment with higher fertilization.Implications: High temperature and precipitation and nutritional deficiency increase damage by phytopathogenic fungi. Conclusion: The incidence and severity of the damage caused by Alternaria sp., Curvularia geniculata and Fusarium equiseti, in the crop increases when there are conditions of nutritional deficiency, in addition, nutrient-deficient plants have lower height and fresh biomass.

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“…En México, se ha reportado la resistencia y susceptibilidad de estos patógenos. El umbral económico es de 3% (Bordin et al, 2016), sin embargo, se ha registrado incidencias entre 25 y 92% (Barrios et al, 2016), infiriendo que la mayoría de los genotipos nacionales podrían ser afectados significativamente cuando exista un ambiente favorable para el desarrollo de los patógenos.…”

Section: Manchado De Grano De Arroz Causados Por Hongos Fitopatógenosunclassified

Incremento de la patogenicidad de hongos en arroz bajo condiciones de desbalance nutricional

2022

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El presente artículo discute los hongos fitopatógenos potenciales que afectan al cultivo de arroz en condiciones de desbalance nutricional. A nivel mundial el arroz es considerado como el tercer cultivo alimentario de mayor importancia. Sin embargo, es afectado por diversos hongos fitopatógenos que ocasionan daños en hojas, tallos, panículas y granos del cultivo. La incidencia de estos hongos se debe a factores como la temperatura (25-37 ºC), humedad relativa (70-76%), humedad en el suelo, el viento y desbalance nutricional. El género Rhizoctonia causa manchas con forma elíptica de coloración marrón, pudrición de tallos y panículas, lo que reduce el 19% del rendimiento. Por otra parte, los hongos que se encuentran dentro de los géneros Alternaria, Fusarium, Curvularia y Pyricularia provocan manchas de color café y disminuyen la germinación, rendimiento, peso específico del grano (g L-1). Aunque existen investigaciones acerca de los hongos que afectan al cultivo del arroz, la asociación entre el desbalance nutricional y la incidencia de patógenos aún está por evaluarse en germoplasmas superiores a 100 variedades de arroz en condiciones óptimas y de desbalance nutricional.

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Critical-point models to relate yield and disease intensity of the multiple pathosystem in rice leaf spots disease

Cited by 4 publications

References 9 publications

Occurrence of rice blast on and grain quality of irrigated rice fertilized with nitrogen and silicates

Occurrence of rice blast on and grain quality of irrigated rice fertilized with nitrogen and silicates

Incidencia Y Severidad Del Daño Por Hongos en Líneas De Arroz Sometidas a Dosis De Fertilización

Incremento de la patogenicidad de hongos en arroz bajo condiciones de desbalance nutricional

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