Pseudocercospora fuligena causing leaf mold of tomato in Roraima, Brazil

Halfeld-Vieira, Bernardo A.; Nechet, K. de L.; Barbosa, Rosianne Nara Thomé

doi:10.1590/s0100-41582006000300018

Cited by 8 publications

(7 citation statements)

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“…Black leaf mould (BLM) is one of the most economically important fungal diseases of tomato in Asia (Roldan 1938;Chupp 1954;Hsieh and Goh 1990). It is also widely distributed in other parts of the world (Blazquez and Alfieri 1974;CAB International 1982;Halfeld-Vieira et al 2006). It is the most important foliar disease of tomato in greenhouses of the South-East Asian countries particularly in the rainy season during the months of mid-May to October (Takahashi and Yasunari, 2006) due to the combined effect of warm temperature and high relative humidity, which highly favour disease development.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Dynamics of Black Leaf Mould (Pseudocercospora fuligena) on Greenhouse‐Grown Fresh Market Tomatoes

Mersha

Zhang

Hau

2013

Journal of Phytopathology

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Black leaf mould (BLM), caused by Pseudocercospora fuligena, is a major fungal foliar disease of greenhouse-grown tomatoes in the humid tropics. Quantifying the disease and yield loss from seasonal plantings will help mitigate the heavy reliance on frequent sprays of curative fungicides. In this study, severity of BLM was investigated in sequential plantings of tomatoes in two 50-mesh BioNet greenhouses in central Thailand from June 2005 to January 2007. Each planting consisted of a block of six plants that received two applications of mancozeb and another block of six plants with no fungicide application at all. Two BLM peak epidemic periods were identified, that is, from plantings that were started in August-September and in January. On average, a yield loss of 30.6% was recorded from the two peak epidemic periods based on comparison of fungicide-sprayed and non-sprayed plants. Two sprays of mancozeb resulted in 71.6% reduction in disease severity during these peak epidemic periods. Mean disease severity (DS*) was highly correlated with a favourability index of relative humidity (RH), which was quantified on a scale of 0 (<85%, nonfavourable) to 1 (≥85%, extremely favourable). A three-parameter logistic function explained the data well (R 2 = 0.81, P < 0.0001). Marketable yield (MY) was positively correlated with maximum plant height (PH max ) but negatively correlated with DS*. In addition, MY was higher from plantings during October to December. It was predicted well (R 2 = 0.60; P < 0.0001) using the model MY = (a + b 9 PH max ) 9 (1-c 9 DS*), which combined both PH max and DS*. Using this model, a reduction of 1.05% in marketable yield was predicted for each 1% increase in mean disease severity. The outcomes of this study implicated the need for management of RH and critical relevance of protecting tomato plants against BLM when they are grown during the peak epidemic periods.

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Section: Introductionmentioning

confidence: 99%

Seasonal Dynamics of Black Leaf Mould (Pseudocercospora fuligena) on Greenhouse‐Grown Fresh Market Tomatoes

Mersha

Zhang

Hau

2013

Journal of Phytopathology

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“…Apesar de registrada no Brasil (Crous & Braun, 2003), não se conhecem as áreas de incidência no País. Entretanto, em 2005 em Roraima danos consideráveis foram observados em plantas cultivadas em cultivo protegido (Halfeld-Vieira et al, 2006;Halfeld-Vieira et al, 2008).…”

Section: Introductionunclassified

“…Uma suspensão de conídios de P. fuligena, do isolado obtido por Halfeld-Vieira et al (2006), foi preparada com esporos coletados manchas presentes em folíolos de plantas da cultivar Débora plus, 27 dias após a inoculação. Os folíolos foram colocados em béquer com água destilada esterilizada, em agitador magnético e a suspensão centrifugada a 7.000 g por 5 min, dispensando-se o sobrenadante.…”

Section: Introductionunclassified

Influência de diferentes períodos de molhamento foliar na germinação de conídios de Pseudocercospora fuligena

Halfeld-Vieira¹,

Nechet²,

Souza³

2009

Acta Amaz.

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Tomato leaf mold caused by Pseudocercospora fuligena is an uncommon disease in Brazil; however, it presents high damage potential to the culture. The objective of this paper was to study the influence of different leaf wetness periods on conidial germination of P. fuligena. Conidia of the pathogen were collected from infected leaflets and inoculated on the abaxial side of healthy leaflets using a brush. Treatments were represented by leaves maintained in a humid chamber for 0, 4, 8, 12, 16, 20 e 24 h periods evaluating the percentage of germinated conidia after 24 h. The experimental observations demonstrate that leaf wetness periods higher than 16 h proportionate the maximum percentage of conidial germination.

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“…Por apresentar sintomas similares à mancha-decladospório (Cladosporium fulvum Cooke) (Hartman et al, 1991;Halfeld-Vieira, et al, 2006), a doença pode estar ocorrendo em cultivos de tomateiro, sem ser diagnosticada adequadamente.…”

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“…No ano de 2005, Halfeld-Vieira, et al (2006 detectaram a doença em plantios comerciais em cultivo protegido na cidade de Boa Vista RR, em alta severidade, ocasionando queima foliar, com inviabilização temporária da continuidade da atividade.…”

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