Quantificação de propágulos de Gibberella zeae no ar e infecção de anteras em trigo

Panisson, Edivan; Reis, Erlei Melo; Boller, Walter

doi:10.1590/s0100-41582002000500009

Cited by 13 publications

(12 citation statements)

References 13 publications

(20 reference statements)

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“…The present results agree with previous studies carried out in Passo Fundo during the 80's (Reis, 1988;Reis, 1990) and in the 2000 growing season (Panisson et al, 2002). In those studies, peaks in colony counts were associated with rain events and high relative humidity.…”

Section: Resultssupporting

confidence: 93%

“…In those studies, peaks in colony counts were associated with rain events and high relative humidity. However, Panisson et al (2002) observed that the number of propagules detected was 4.5 times higher than previously observed (Reis, 1988). The authors suggested that the higher concentration of residue in the region, due to an increased no-till cropping system, could have contributed to a higher inoculum pressure than found in previous decades (Panisson et al, 2002).…”

Section: Resultscontrasting

confidence: 64%

“…The values observed here were most similar to data observed by Reis (1988). Panisson et al (2002) hypothesized that the proximity of the samplers to the wheat heads could have facilitated detection of splashed spores, apparently macroconidia. We also hypothesize a yearly effect, since a higher frequency of rain events from wheat heading to grain filling was observed in the 2000 season, which may have contributed to an increase in spore production and high FHB epidemic levels observed that year (Panisson et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

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Factors affecting density of airborne Gibberella zeae inoculum

2005

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Fusarium head blight (FHB) is a disease of increasing concern in the production of wheat (Triticum aestivum). This work studied some of the factors affecting the density of airborne Gibberella zeae inoculum. Spore samplers were placed at the edge of a field in order to observe spore deposition over a period of 45 days and nights in September and October, the period that coincides with wheat flowering. Gibberella zeae colonies were counted for each period and values transformed to relative density. A stepwise regression procedure was used to identify weather variables helpful in predicting spore cloud density. In general, a predominant night-time spore deposition was observed. Precipitation and daily mean relative humidity over 90% were the factors most hightly associated with peak events of spores in the air. Models for predicting spore cloud density simulated reasonably well with the fluctuation of airborne propagules during both night and day, with potential to be integrated into an FHB risk model framework.Additional keywords: Fusarium graminearum, aerobiology, spore dispersal, epidemiology. RESUMO Fatores que influenciam a densidade de inóculo aéreo de Gibberella zeaeA giberela, causada por Gibberella zeae, é uma das mais importantes doenças do trigo (Triticum aestivum). O presente trabalho objetivou estudar alguns aspectos que influenciam a densidade de inóculo aéreo. Armadilhas caça-esporos foram instaladas ao lado de parcelas experimentais de trigo com coletas realizadas durante o período da noite e do dia, por 45 dias nos meses de setembro a outubro, coincidindo com o florescimento do trigo. O número de colônias de G. zeae, avaliadas em cada período, foi transformado para valores relativos e correlacionado com variáveis ambientais. Uma análise de regressão foi utilizada para se identificar as variáveis climáticas úteis para a predição da densidade da nuvem de esporos. Foi observada uma predominância de deposição de inóculo aéreo no período da noite. Ocorrência de chuva e umidade relativa média diária superior a 90% estiveram fortemente associados com picos de concentração de inóculo aéreo. Os modelos simularam os incrementos na densidade da nuvem de esporos, apresentando potencial para serem integrados em um modelo de simulação do risco de giberela.Palavras-chave adicionais: Fusarium graminearum, aerobiolobia, dispersão de esporos, epidemiologia.

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Section: Resultssupporting

confidence: 93%

Section: Resultscontrasting

confidence: 64%

Section: Resultsmentioning

confidence: 99%

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Factors affecting density of airborne Gibberella zeae inoculum

2005

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“…É indiscutível a importância da chuva para início de surtos epidêmicos em determinados patossistemas. Na cultura do trigo, por exemplo, não se observou infecção de G. zeae em períodos sem precipitação (Reis 1988), além disso, a baixa precipitação pluvial foi responsável por uma baixa população desse fungo no campo (Panisson et al, 2002). Neste caso, possivelmente deve ter existido um sistema de irrigação adequado, que evitou o estresse hídrico, e, também a manifestação mais severa da doença na cultura.…”

Section: Resultsunclassified

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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“…are also found in wheat, particularly F. graminearum, F. culmorum, and F. avenaceum, causing Fusariosis, (CALORI-DOMINGUES et al, 2007), which is considered one of the major diseases of wet regions in Brazil (PANISSON et al, 2002;CASA et al, 2004;CALORI-DOMINGUES et al, 2007). The presence of mycotoxins is associated with symptoms of acute illnesses such as nausea, vomiting, dizziness, gastrointestinal problems, and diarrhea; thus, in crops of corn and wheat, the presence of these pathogenic fungi can reduce productivity and cause damage to animal and human health, in addition to being difficult to control (CASA et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Antifungal potential and phytochemistry of Tetrapterys multiglandulosa CAV aerial parts

Facco¹,

Müller²,

Matias³

et al. 2016

Biosci. J.

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Tetrapterys spp. are considered toxic to grazing animals owing to the presence of a poisonous constituent cardiotonic glycoside. However, other chemicals within the plant have allelopathic, bactericidal, and fungicidal activities. The objective of this study was to search for natural products as alternatives in the control of plant pathogenic fungi, which diminish the crop productivity and cause damage to animal and human health. The phytochemical content of the stems and leaves was investigated alongside the fungitoxic potential of aqueous and ethanol extracts from aerial parts of T. multiglandulosa on Fusarium moniliforme and F. graminearum. The leaves and stems were obtained from 20 arrays of T. multiglandulosa from Batayporã City, south of Mato Grosso do Sul, and classified as young and mature. The botanical material was oven dried, crushed, and its aqueous and 20% ethanol extracts were used for qualitative and quantitative phytochemical assays. For in vitro tests of fungal growth inhibition, extract concentrations of 200, 400, 800, 1600, and 2000 µg L -1 were assayed, with two control groups. Phytochemical tests from aqueous and ethanol extracts of young and mature leaves indicated the presence of phenolic compounds, tannins, flavonoids, saponins, alkaloids, and cardiotonic glycosides. The aqueous extract of young leaves showed potential fungicidal activity against F. graminearum, with values ranging from 21.25% to 33.53% colony growth inhibition.

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Quantificação de propágulos de Gibberella zeae no ar e infecção de anteras em trigo

Cited by 13 publications

References 13 publications

Factors affecting density of airborne Gibberella zeae inoculum

Factors affecting density of airborne Gibberella zeae inoculum

Dispersão anemófila do fungo Lasiodiplodia theobromae em plantações de coqueiro

Antifungal potential and phytochemistry of Tetrapterys multiglandulosa CAV aerial parts

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