Dano devido à podridão vermelha da raiz na cultura da soja

Freitas, Tânia Márcia de Queiroz; Meneghetti, Rosana Ceolin; Balardin, Ricardo Silveiro

doi:10.1590/s0103-84782004000400004

Cited by 7 publications

(5 citation statements)

References 14 publications

(19 reference statements)

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“…The Brazilian soybean [Glycine max (L.) Merrill] crop cultivated in 2018/19 covered an area of 35 million hectares and yielded 2.8 t/ha, resulting in an overall production of 50 million tons (CONAB, 2019 GROGAN, 1979;FARIAS NETTO et al, 2008;HARTMAN;SINCLAIR;RUPE, 1999;). Sclerotinia stem rot is one of the most devastating soybean diseases in the central states of Brazil, where up to a 20% reduction in soybean yields due to WM has been reported (FARIAS NETO et al, 2008). In the present work, damage is used according to Nutter, Teng and Royer (1993).…”

Section: Introductionmentioning

confidence: 99%

A critical-point yield model to appraise the damage caused to soybean by white-mold

Reis¹,

Zanatta²,

Juliatti³

et al. 2020

Biosci. J.

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A model to estimate the damage caused by white mold to soybean yield from experimental field data gathered during the summer season of 2009-10 was generated. Six soybean cultivars were grown on six sites of the Cerrados region, resulting in a total of nine separate experiments. The gradient of disease intensity (plant stem incidence) and yield was generated through the application of different fungicides and rates three times over the course of the season. The disease incidence in plant stems was evaluated at the R1, R5.2 and R5.5 growing stages. Manual harvest at the physiological ripening stage was followed by grain drying, threshing, and cleaning. Finally, grain yield was estimated in kg/ha, and regression analysis was performed. Nine linear equations representing the damage function were generated. The mean damage function was y = - 6.7 x + 1,000, where y represents grain yield normalized to 1,000 kg/ha and x represents WM incidence in plants. To appraise the damage caused by various disease intensities, these models should first be validated. Damage coefficients may be used to determine the level of economic damage.

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Section: Introductionmentioning

confidence: 99%

A critical-point yield model to appraise the damage caused to soybean by white-mold

Reis¹,

Zanatta²,

Juliatti³

et al. 2020

Biosci. J.

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“…A SMS se caracteriza por manchas avermelhadas, mais visíveis na raiz principal e, geralmente, localizadas a 1 ou 2 cm abaixo do nível do solo. Com a evolução da infecção, é observada uma expansão da lesão, que passa a circundar a raiz, assumindo coloração castanho-avermelhada escura e, à medida que as lesões evoluem, pode ser observada uma massa azulada formada por conídios do patógeno (FREITAS;MENEGHETTI;BALARDIN, 2004). Perdas causadas pela SMS dependem de vários fatores, incluindo o estádio de desenvolvimento da planta no momento da infecção pelo patógeno, genótipo utilizado e condições ambientais existentes (ROY et al, 1997).…”

Section: Introductionunclassified

Detecção de Fusarium spp. e Trichoderma spp. e antagonismo de Trichoderma sp. em soja sob plantio direto

et al. 2013

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ii) morphologically identify isolates of Fusarium spp. from plants roots with SDS; iii) evaluate the antagonism between Trichoderma spp. and Fusarium spp. isolates from rhizospheric soil and roots from with and without SDS, respectively; and iv) characterize through the ITS1-5.8S-ITS2 region of rDNA the isolates of Trichoderma spp. with better performance in the direct confrontation. The sampling of soil and roots was performed in an experimental area located in Cruz Alta, RS, Brazil. In the laboratory, serial dilutions of soil samples, counting of the number of Colony Forming Units (UFCs/g -1 of rhizospheric soil) were performed as well as isolation for identification of isolates of Fusarium spp. and Trichoderma spp. and testing of direct confrontation. There were significant differences between the population of Trichoderma spp. in the rhizosphere of plants with and without symptoms of SDS. For the population of Fusarium spp., significant difference was observed only in the rhizosphere of plants without symptoms of SDS. In diseased roots the following species were identified: F. solani, F. avenaceum, F. graminearum, F. oxysporum and F. verticillioides. In the test of direct confrontation, eight isolates of Trichoderma spp. achieved the best performance in the antagonism to Fusarium spp. and Trichoderma spp. from areas with symptoms of SDS had a higher control efficiency in vitro. These isolates showed high similarity to the species of T. koningii agregate.

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“…Los daños promedio fueron de 1514 kg/ha (rango 192-3770 kg/ha) lo que significa una pérdida promedio de 22% (rango 4-46%). Estas fueron similares a las obtenidas por Freitasi et al (2004), donde en parcelas de ensayos informaron pérdidas de 1423 kg/ha. Asimismo, los resultados del presente trabajo fueron semejantes a lo informado por Bird et al (2010), de la Universidad de Wisconsin, con registros entre 20 y 50%, y con los determinados en 2009 en Michigan (EEUU), que redujeron en forma significativa el rendimiento (Chilvers, 2011).…”

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Aislamiento, identificación y daños asociados al síndrome de la muerte súbita en el cultivo de soja en Argentina

Scandiani¹,

Carmona²,

Luque³

et al. 2012

Trop. plant pathol.

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RESUMENLos objetivos de este trabajo fueron aislar e identificar los agentes causales del síndrome de la muerte súbita (SMS) en muestras provenientes de diferentes localidades de Argentina, y cuantificar la incidencia de la enfermedad y los daños causados a campo en el rendimiento. Se analizaron 215 raíces provenientes de plantas con síntoma foliares típicos de SMS para el aislamiento e identificación de los agentes causales. Para realizar las pruebas de patogenicidad se efectuaron dos bioensayos en invernáculo. Los daños fueron estimados en un ensayo a campo situado en Pergamino a través de la cuantificación del rendimiento de muestras apareadas. El 36% (78 raíces) de las raíces presentó signos de Fusarium, compatibles con los causantes de SMS. Los estudios morfológicos realizados permitieron identificar 35 aislamientos como F. tucumaniae y 18, como F. virguliforme. Otros ocho aislamientos no pudieron identificarse. Todos los aislamientos inoculados reprodujeron los síntomas foliares típicos de SMS. Se observaron diferencias entre el peso de mil granos de plantas sanas y de plantas enfermas y entre el rendimiento potencial y el real (p<0,05). Los daños promedio fueron de 1514 kg/ha (rango 192-3770 kg/ha). Los resultados obtenidos corroboraron la distribución y predominio de F. tucumaniae y F. viguliforme en el área estudiada y su potencial destructivo. Palabras clave: Glycine max, Fusarium tucumaniae, Fusarium virguliforme, SMS. ABSTRACT Isolation, identification and yield losses associated with sudden death syndrome in soybeans in ArgentinaThe main objectives of this work were to isolate and identify the causal agents of sudden death syndrome (SDS) from samples collected in different Argentinean localities, to quantify its incidence, and to estimate yield losses. Two hundred and fifteen roots from plants with typical SDS foliar symptoms were analyzed. In order to perform pathogenicity tests, two bioassays were conducted in the greenhouse. Yield losses were estimated in a field trial located in Pergamino by quantification and comparison of yield of paired samples. Thirty-six percent of total roots (78 roots) presented signs of Fusarium, compatible with signs caused by SDS. Morphological studies allowed the identification of 35 isolates as F. tucumaniae and 18 as F. virguliforme. Other eight isolates could not be identified. All isolates that were inoculated reproduced typical SDS foliar symptoms. Significant differences were observed between healthy and diseased plants for 1000-grain weight and between potential and real yield (p<0.05). Average yield loss was 1514 kg/ha (range 192-3770 kg/ha). These results corroborated the distribution and predominance of F. tucumaniae and F. viguliforme in the area under study and its destructive potential.

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Dano devido à podridão vermelha da raiz na cultura da soja

Cited by 7 publications

References 14 publications

A critical-point yield model to appraise the damage caused to soybean by white-mold

A critical-point yield model to appraise the damage caused to soybean by white-mold

Detecção de Fusarium spp. e Trichoderma spp. e antagonismo de Trichoderma sp. em soja sob plantio direto

Aislamiento, identificación y daños asociados al síndrome de la muerte súbita en el cultivo de soja en Argentina

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