Aspectos epidemiológicos da ferrugem alaranjada da cana-de-açúcar

Martins, Thais Dias

doi:10.11606/t.11.2011.tde-14022011-080631

Cited by 3 publications

(4 citation statements)

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“…Inoculation was carried out on 60-day-old plants using a manual sprayer; inoculation of primarily the abaxial surface of leaves continued until run-off. After inoculation, the plants remained for 24 h in a dew chamber at an average temperature 22°C, conditions considered optimal for spore germination (Minchio et al 2011) and infection (Infante et al 2009;Martins 2010). Subsequently, the plants were transferred to a greenhouse under ambient conditions and irrigated as needed.…”

Section: Artificial Inoculation 1: Sprayingmentioning

confidence: 99%

Reaction of sugarcane varieties to orange rust (Puccinia kuehnii) and methods for rapid identification of resistant genotypes

Chapola

Hoffmann

Júnior

2016

Trop. plant pathol.

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Sugarcane orange rust was recently introduced into Brazil and its control is based on the use of resistant varieties. This study aimed to determine the reaction of Brazilian sugarcane varieties to the disease in the field and to compare artificial inoculation methods. Rust severity was assessed in 17 varieties at a 15-day interval. The maximum disease severity (MS%) and the area under the disease progress curve (AUDPC) were determined for each genotype. The artificial inoculation methods tested were: spraying of a spore suspension on 60-day-old plants in the greenhouse, or placing the spore suspension into the leaf whorl of 5-month-old fieldgrown plants. Nine out of the 17 varieties studied were resistant to the disease, including the most widely grown in new plantings, RB867515 and RB966928. Varieties RB72454, SP89-1115 and SP79-2233 were susceptible, while RB925211 and SP81-3250 were moderately susceptible. Varieties RB855156, RB92579 and SP83-2847 showed an intermediate reaction. Both inoculation methods correlated well with field results. Spray inoculation discriminates better the responses of the varieties and enables the evaluation of more disease variables. Leaf whorl inoculation allows the use of field-grown plants and generates results in a shorter time.

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Section: Artificial Inoculation 1: Sprayingmentioning

confidence: 99%

Reaction of sugarcane varieties to orange rust (Puccinia kuehnii) and methods for rapid identification of resistant genotypes

Chapola

Hoffmann

Júnior

2016

Trop. plant pathol.

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“…A coalescência das pústulas aos 20 DAI merece destaque, pois em trabalho semelhante desenvolvido na Flórida, Martins (2010), inoculando a cultivar CL 85-1040 com uma suspensão na concentração de 1x10 5 urediniósporos.mL -1 , realizou a avaliação de severidade de P. kuehnii através de contagem das pústulas até observar sua estabilidade, o que ocorreu aproximadamente 30 dias após a inoculação. No período avaliado, os dados apresentados assim como as fotos dos sintomas, tornaram evidente a baixa severidade da doença com relação ao que foi encontrado neste trabalho.…”

Section: Avaliação Da Cultivar Padrão Suscetível Em Condições Controlunclassified

Reação de cultivares e época de avaliação da ferrugem alaranjada da cana-de-açúcar

Klosowski¹,

Filho²,

Ruaro³

et al. 2015

Biosci. J.

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RESUMO:Os objetivos deste estudo foram avaliar a reação de 28 cultivares de cana-de-açúcar à ferrugem alaranjada, em campo, estabelecendo uma época de avaliação adequada para os programas de melhoramento, e determinar os períodos de incubação e latência, incidência e severidade na cultivar padrão suscetível, em casa-de-vegetação. No campo, a severidade foi avaliada em cana-planta (dez meses) e em cana-soca (três, cinco, sete e nove meses). A partir destes dados, calculou-se a área abaixo da curva de progresso da doença (AACPD). Para estabelecer a época de avaliação adequada, calculou-se a correlação de Pearson entre os resíduos das datas com os da AACPD. Em casa-de-vegetação, inoculou-se a cultivar RB72454 e avaliou-se incidência e severidade. Das cultivares avaliadas, 14 foram suscetíveis à ferrugem alaranjada, sendo discriminadas em quatro grupos de suscetibilidade. A avaliação em maio (cana-soca, aos nove meses), foi a que mais se correlacionou com a AACPD, sendo a época adequada para avaliar a reação de cultivares à doença, no norte do Estado do Paraná. O período de incubação e latência na cultivar padrão suscetível foi de sete e dez dias, respectivamente. A cultivar RB72454 é a única altamente suscetível à ferrugem alaranjada e as demais avaliadas apresentam menores graus de suscetibilidade.

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“…Chlorotic spots in the leaves progressed to exposing spores lesions. Grouped orange rust pustules were ordinarily found in the middle third and bottom of the leaves (Figure 1), a specific characteristic of P. kuenhii in sugarcane, also described by Martins (2010) and Glynn et al (2010). According to Glynn et al (2010), these symptoms distinguish P. kuenhii from Puccinia melanocephala, reported in Pernambuco since the 1980s and quite common in sugarcane fields in northeastern Brazil.…”

mentioning

confidence: 81%

“…Since growing susceptible varieties under favorable conditions for disease development should be avoided (Martins, 2010), the increase in use of P. kuenhii resistant genotypes may affect genotype resistance due to the pathogen's variability (Magarey et al, 2001). Occurrence of rain associated with high relative humidity and high summer temperatures, as well as frequent shifts in heat and cold temperatures during autumn (Ovalle et al, 2009;Magarey, 2000) are favorable conditions for disease development.…”

mentioning

confidence: 99%