Padrões de liberação de urediniósporos e desenvolvimento da ferrugem do jambeiro

Blum, Luiz Eduardo Bassay; Dianese, J. C.

doi:10.1590/s0100-204x2001000600001

Cited by 17 publications

(7 citation statements)

References 7 publications

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“…Higher concentrations of airborne urediniospores occurred during early-morning conditions that included a combination of average temperature of 19°C, light intensity of 0.03 KW m À2 , relative humidity >80% and leaf wetness <1 h. Similar to our finding, the capture of urediniospores of P. psidii from S. jambos was positively correlated with the number of days with at least 6 h of leaf wetness or at least 90% relative humidity combined with temperatures ranging between 18 and 20°C (Tessmann et al 2001). Also with S. jambos, Blum and Dianese (2001) found a negative correlation between number of P. psidii urediniospores dispersed into the air with the temperature at noon, whereas a positive correlation was noted between urediniospore numbers and RH ≥80% and temperatures ≤20°C with increased spore load from May to July between 10 am and 1 pm. The nocturnal periodicity of urediniospores of P. psidii in the air contrasts with that reported for various other fungi (Rich and Waggoner 1962;Grove 1998;Byrne et al 2000;Casa et al 2004;Jones and Harrison 2004) and other rusts for which peaks of spore capture occurred in the early afternoon (Cammack 1955;Pady et al 1965).…”

Section: Discussionsupporting

confidence: 87%

“…). Also with S. jambos , Blum and Dianese () found a negative correlation between number of P. psidii urediniospores dispersed into the air with the temperature at noon, whereas a positive correlation was noted between urediniospore numbers and RH ≥80% and temperatures ≤20°C with increased spore load from May to July between 10 am and 1 pm. The nocturnal periodicity of urediniospores of P. psidii in the air contrasts with that reported for various other fungi (Rich and Waggoner ; Grove ; Byrne et al.…”

Section: Discussionmentioning

confidence: 96%

“…; Fulton ) and/or wash them from the pustules, depositing them into the soil and preventing their release into the atmosphere. A 3‐day period of rainfall resulted in the lack of urediniospore detection of P. psidii , this event may be attributed to a reduction of airborne urediniospores (Blum and Dianese ). Apart from rainfall, from December to June, the average temperature exceeded 23°C for several consecutive days and the light intensity was five times higher than from July to November.…”

Section: Discussionmentioning

confidence: 99%

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Wind dispersal of Puccinia psidii urediniospores and progress of eucalypt rust

et al. 2014

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Summary To identify and implement Puccinia psidii control strategies, it is essential to understand the role of environmental factors on rust‐disease development and spread among eucalypt (Eucalyptus spp.) plantations. In this study, we evaluated the wind dispersal of P. psidii urediniospores and the progress of eucalypt rust in a field trial in Brazil. Urediniospores of P. psidii were trapped in a Burkard® spore trap from July 2004 to June 2005. To evaluate the progress of eucalypt rust, plots were established in March 2002 using a clonal hedge scheme. The incidence of both branches and leaves with rust was assessed weekly from February 2003 to October 2005. Disease progress was studied using time‐series analysis. Urediniospores were trapped on 77% of the days sampled. The highest average urediniospore concentration was detected from July to November, and most of the urediniospores (58%) were trapped at night. Urediniospore concentration was negatively correlated with rainfall, light intensity, minimum, average and maximum temperatures and wind speed, whereas urediniospore concentration was positively correlated with leaf‐wetness duration and relative humidity. From December 2004 to June 2005, average urediniospore concentration was 0.22 spores m−3 air h−1 and had no correlation with meteorological data. The highest average urediniospore concentration was associated with a combination of low average temperature, low light intensity, low wind speed, high relative humidity and high leaf wetness, which reflect conditions observed at night. The disease incidence was positively correlated with the urediniospores trapped at 12 days prior to disease assessment. According to the models obtained by the time series, a seasonal yearly effect was found on rust progress. Using our models, we were also able to forecast disease incidence up to 3 months after the last field assessment.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

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Wind dispersal of Puccinia psidii urediniospores and progress of eucalypt rust

et al. 2014

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“…No Brasil, quantificações de esporos de alguns fungos fitopatogênicos capturados em armadilhas foram relatadas por diversos autores, em algumas culturas como o trigo (Triticum aestivum L.) (Santos et al, 1986), arroz (Oryza sativa L.) (Costa, 1991), jambeiro [Syzygium jambos (L.) Alston] (Blum & Dianese, 2001) e milho (Zea mays L.) (Reis & Mário, 2003).…”

Section: Introductionunclassified

Dispersão anemófila do fungo Lasiodiplodia theobromae em plantações de coqueiro

Correia

Costa

2005

Fitopatol. bras.

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RESUMONeste trabalho determinou-se a dispersão anemófila de conídios de Lasiodiplodia theobromae, agente causal da queima das folhas do coqueiro (Cocos nucifera), e sua relação com a precipitação pluviométrica. Para tanto, cinco armadilhas cata-vento e uma armadilha tipo Burkard, coletoras de esporos, foram instaladas nas entrelinhas de um coqueiral, a 1,80 m de altura do solo. Os conídios foram capturados em fitas transparentes, untadas com solução adesiva de gelvatol e vaselina. Semanalmente, as fitas foram retiradas das armadilhas e remontadas em lâminas para microscopia, onde era contado o número de conídios capturados, com auxilio de um microscópio. Esses dados foram coletados durante um ano e relacionados com dados pluviométricos obtidos na área experimental. Para as armadilhas cata-vento, a maior quantidade de conídios foi de 231 unidades, no mês de outubro. Para a armadilha Burkard, a maior quantidade capturada foi de 3.072 conídios, no mês de junho. Em geral, durante todo o ano, houve predominância na liberação de esporos no período diurno, ocorrendo maior captura entre 6:00 e 10:00 h. O número de conídios capturados pelos dois tipos de armadilhas relacionou-se com a precipitação de forma positiva entre 25 e 80 mm, e após 80 mm, negativamente. Foram estabelecidas curvas de tendências da quantidade de conídios capturados nos dois tipos de armadilhas, em função da pluviosidade mensal, através de equações de regressões cúbicas. As curvas apresentaram formatos semelhantes. A liberação dos conídios foi estimulada sempre que a pluviosidade mensal atingia o mínimo de 25 mm. O ponto de máxima da curva, correspondente a 80 mm de chuva, indica que acima deste volume os conídios são precipitados do ar.Palavras-chave adicionais: queima das folhas, aerobiologia, epidemiologia. ABSTRACT Aerial dispersion of Lasiodiplodia theobromae in coconut plantationsThe objective of this research was to study the aerial dispersion of Lasiodiplodia theobromae, the causal agent of coconut (Cocos nucifera) leaf blight, and its relationship with pluviometric precipitation. Five wind catcher spore traps and one Burkard spore trap were installed in a coconut plantation, at a height of 1.80 m from the ground. The conidia were captured in transparent tapes covered with gelvatol and vaseline. Every week, the tapes were retrieved and mounted on slides for microscopy, where the number of trapped conidia was determinated. For the wind catcher trap, the highest amount of trapped conidia was 231 units in the month of October. For the Burkard spore trap the highest amount of captured conidia was 3072 units achieved in June. In general, during a-year-round sampling, there was a predominance of conidia liberation during the diurnal period. The highest amount of conidia was captured from 6:00 to 10:00 a.m. The number of conidia trapped by the two types of devices correlated positively with the amount of precipitation ranging from 25 to 80 mm. Above 80 mm of rain, the correlation was negative. Curves of tendency were established indicating that the...

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“…Almager et al 2013, in Havana, Cuba, reported that the most common taxa peaking at 11:00 am to 12:00 pm were Cladosporium, Bipolaris, Nigrospora, Periconia, Alternaria, Uredinales-type, Pseudocercospora, Chaetomium, Curvularia, Monodictys, Stemphyllium and Pithomyces. Blum & Dianese (2001) reported that most of the Puccinia psidii urediniospores were collected between 10:00 am to 1:00 pm, in Brasilia, DF, Brazil, during a survey made in 1988. In the present work, in both soybean growing seasons most of the hourly urediniospores was collected from 10:00 am through 6:00 pm and the highest number was at 3:00 pm ( Figure 3A).…”

Section: Discussionmentioning

confidence: 99%

Hourly and daily changes on airborne urediniospores of Phakopsora pachyrhizi

Lima¹,

Blum²,

Uesugi³

2019

Biosci. J.

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The Asian rust (Phakopsora pachyrhizi) is one of the most destructive diseases of soybean in Brazil. Despite its importance, little is known about the airborne inoculum production dynamics of pathogen throughout the soybean cycle in Brazil. The objective of this study was to assess the temporal variation of air collected P. pachyrhizi urediniospores using a Burkard 7-day-spore-trap during 2006-2007 and 2007-2008, from November to March of each soybean (MSoy-8001) growing season. The disease severity was quantified on soybean planted in

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Padrões de liberação de urediniósporos e desenvolvimento da ferrugem do jambeiro

Cited by 17 publications

References 7 publications

Wind dispersal of Puccinia psidii urediniospores and progress of eucalypt rust

Wind dispersal of Puccinia psidii urediniospores and progress of eucalypt rust

Dispersão anemófila do fungo Lasiodiplodia theobromae em plantações de coqueiro

Hourly and daily changes on airborne urediniospores of Phakopsora pachyrhizi

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