Relações lineares entre incidência e severidade foliar em patossistema multiplo de manchas foliares em arroz irrigado

Bordin, Luiz Carlos; Casa, Ricardo Trezzi; Marcuzzo, Leandro Luiz; Souza, Clóvis Arruda; Gheller, A.C .; Zancan, Rômulo Luís; Stoltz, Juan Carlo

doi:10.1590/0100-5405/2081

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…In the second growing season, there was a significant and positive correlation between IBM and SMB (r = 0.82, p <0.01); (P <0.01), i.e., the higher the proportion of diseased leaves, the greater the percentage of injured leaf area on the leaf of the first ear for these traits. According to Amorim (1995) andBergamin Filho (1996), for leaf diseases, the severity adequately represents the disease level, although the determination is somewhat unreliable, due to the high subjectivity of estimation and the need of training or continuous use of a diagrammatic scale (Bordin et al, 2018). Analogously to the GCA correlation between these traits in the second season, it is possible to recommend and use only the incidence of B. maydis and E. turcicum to discriminate the most resistant hybrids, optimizing the time of disease evaluation in the field.…”

Section: Correlation Between Traits With the Genotype Value Of The Hybridsmentioning

confidence: 99%

Genetic Merit of Popcorn Lines and Hybrids for Multiple Foliar Diseases and Agronomic Properties

Santos¹,

Souza²,

Vivas³

et al. 2020

FPBJ

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Popcorn lines with genetic resistance to foliar diseases allow the production of higher yields at lower costs. Thus, the development of resistant genotypes becomes essential, while the selection efficiency of parents and hybrids depends on the existence of genetic variability and knowledge about the genetic trait control. The objective of this study was to determine the genetic merit of the hybrid lines and genotypes, as well as the reciprocal effect; to draw conclusions on the genetic control of the traits of disease incidence and severity associated with resistance to Exserohilum turcicum, Bipolaris maydis, Puccinia polysora and of the agronomic traits grain yield and popping expansion; and to assess the effects of the trait interrelations on parent and hybrid selection. Fifty-six hybrid combinations (F1 and reciprocal crosses) were evaluated in two growing seasons. A randomized block design with four replications was used. Regardless of the growing season, the non-additive genetic component had the greatest influence on the studied traits, whereas no reciprocal effect was observed. The performance of lines L61, L70 and L76 was good in both growing seasons by increasing the level of multiple disease resistance associated with high gains in GY and PE. The hybrids L61 x L76; L61 x L77; L76 x P1 were the most promising of the tested crosses for cultivation in both seasons, targeting a decrease in the levels of several diseases and higher grain yields and popping expansion.

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Section: Correlation Between Traits With the Genotype Value Of The Hybridsmentioning

confidence: 99%

Genetic Merit of Popcorn Lines and Hybrids for Multiple Foliar Diseases and Agronomic Properties

Santos¹,

Souza²,

Vivas³

et al. 2020

FPBJ

View full text Add to dashboard Cite

show abstract

“…Durante el ciclo vegetativo del cultivo, se identificaron manchas ovaladas y/o circulares de color café con bordes amarillos, así como hojas con coloración amarillo y anaranjado (Figura 1). Estos síntomas fueron similares a lo reportado por Bordin et al (2016a) quienes describieron estos síntomas como responsables de enfermedades foliares como añublo del arroz, mancha marrón y escaldadura causadas por Pyricularia grisea (Cooke) Saccardo, Bipolaris oryzae (Breda de Hann) Shoemaker y Gerlachia oryzae (Hashioka & Yokogi) W. Gams, respectivamente. Por otro lado, Agbowuro et al (2020) relacionó estos síntomas a la enfermedad añublo del arroz (Pyricularia grisea).…”

Section: Identificación Morfológica Y Molecular De Los Hongos Fitopat...unclassified

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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Relações lineares entre incidência e severidade foliar em patossistema multiplo de manchas foliares em arroz irrigado

Cited by 2 publications

References 5 publications

Genetic Merit of Popcorn Lines and Hybrids for Multiple Foliar Diseases and Agronomic Properties

Genetic Merit of Popcorn Lines and Hybrids for Multiple Foliar Diseases and Agronomic Properties

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

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