Murcha do algodoeiro

Viégas, A. P.

doi:10.1590/s0006-87051961000100017

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…In Brazil, Veigas (1935) have noted the occurrence of the pathogen in only 0.6% of the analyzed seeds. Studies using DNA amplification of F. oxysporum f. sp.…”

Section: Discussionmentioning

confidence: 97%

TRANSMISSIBILITY OF Fusarium oxysporum f. sp. Vasinfectum INOCULATED IN COTTONSEEDS

Pinheiro

Araújo

Ascari

et al. 2018

Nucleus

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The objective of this study was to evaluate the transmissibility of Fusarium oxysporum f.sp.vasinfectum by inoculated cottonseeds. The cottonseeds were inoculated using the water restriction technique, at different times of exposure. A completely randomized design was used in the laboratory and a randomized design with blocks was used in the field experiment, with a 2x5 factorial arrangement with two cultivars (FMT 701 and Delta Opal) and five times of exposure of the pathogen in seeds (0 h, 24 h, 48 h, 72 h and 96 h). There was a reduction in the percentage of germination with the increase of the infection of the seeds when in greater time of contact with the fungus. Delta Opal cultivar presented minor disease index and major pathogen incidence when compared to FMT 701 cultivar. The rates of infection and transmission of the seed pathogen were effective and directly proportional to the inoculum potential in the seeds, with rates of 95% and 1.2%, respectively.

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“…In Brazil, Veigas (1935) have noted the occurrence of the pathogen in only 0.6% of the analyzed seeds. Studies using DNA amplification of F. oxysporum f. sp.…”

Section: Discussionmentioning

confidence: 97%

TRANSMISSIBILITY OF Fusarium oxysporum f. sp. Vasinfectum INOCULATED IN COTTONSEEDS

Pinheiro

Araújo

Ascari

et al. 2018

Nucleus

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“…In addition to soil, FOV can be disseminated by infected seeds and plant materials and by contaminated tools (Hillocks and Kibani, 2002). The occurrence of this pathogen on seed lots of cotton is variable, ranging from 0.6 to 47% (Kulkarni, 1934;Veigas, 1935;Perry, 1962;Bennett et al, 2008). However, the mechanisms of seed infection of FOV and its transmission from seed to seedling and seedling to plant still not fully understood and disserve our attention.…”

Section: Introductionmentioning

confidence: 99%

Transmission and effects of Fusarium oxysporum f. sp. vasinfectum on cotton seeds

Araújo¹,

Machado²,

Pedrozo³

et al. 2016

Afr. J. Agric. Res.

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This paper aimed to evaluate the transmission of Fusarium oxysporum f. sp. vasinfectum (FOV) and the effects of this pathogen on the initial development of cotton plants following inoculation of seeds. Two cultivars (susceptible and resistant) and two strains (most and least aggressive) of the pathogen were used in this study. The inoculation method was based on the contact between seeds and fungal colonies on substrates containing mannitol. Percentage of FOV in seeds and the percentage of seed germination were evaluated by blother test and germination test, after inoculation. Emergence of seedlings and speed index, initial and final stands, size and dry weight of the plants were verified in trays containing soil substrate. Disease severity, pathogen transmission and plant infection, from seed to plant, were determined in separate trial on plants. Occurrence of the pathogen was higher when inoculum potential was increased for all variables analyzed. The number of normal seedlings, determined by seed germination test, decreased when the incidence of the pathogen in the seed was increased. The same occurred to other variables, in which there was difference between cultivars where IAC 20-233 presented the best performance. No significant differences were found between strains for emergence speed index, initial and final stands variables. Transmission and infection rates were increased according to the inoculum potentials increasing and the maximum pathogen transmission rate, from seed to plant was around 50%.

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Estudo comparativo de métodos de deslintamento de sementes de algodoeiro

Ferraz¹,

Filho²,

Cia³

et al. 1977

Bragantia

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Foi realizado estudo comparativo de quatro métodos de deslintamento de sementes de algodoeiro (Gossypium hirsutum L.), utilizando-se a variedade comercial IAC 13-1, durante os anos agrícolas de 1973/74 a 1975/76, em várias localidades do Estado de São Paulo. Os métodos de deslintamento empregados foram: mecânico, com ácido sulfúrico comercial concentrado, com gás clorídrico, e flambagem, todos em presença e ausência do fungicida Pentacloronitrobenzeno (PCNB). O delineamento empregado foi o de blocos ao acaso, com oito tratamentos e seis repetições. Cada parcela continha quatro linhas de 4,0m de comprimento, espaçadas entre si de l,0m, com 100 sementes por linha, perfazendo o total de 400 sementes por parcela. Foram realizadas nas quatro linhas da parcela, quatro contagens de plantas, a intervalos semanais, a partir da data da emergência. Os números obtidos por contagem foram transformados em arc sen Ö %, para a análise estatística. Os resultados obtidos mostraram que os métodos de deslintamento com ácido sulfúrico e gás clorídrico proporcionaram melhor emergência de plantas em comparação com o mecânico. O método de flambagem ocupou posição intermediária. O melhor período para contagem de plantas esteve compreendido entre 12 a 19 dias após a emergência. Foi verificado efeito significativo do fungicida na emergência das plantas somente em quatro localidades. Em outras, embora os números encontrados nas contagens fossem quase sempre maiores para tratamentos fungicidas, o resultado destes não foi significativo. Os resultados para produção de algodão, bem como aqueles relacionados com características tecnológicas da fibra, não foram significativos.

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Murcha do algodoeiro

Cited by 3 publications

References 2 publications

TRANSMISSIBILITY OF Fusarium oxysporum f. sp. Vasinfectum INOCULATED IN COTTONSEEDS

TRANSMISSIBILITY OF Fusarium oxysporum f. sp. Vasinfectum INOCULATED IN COTTONSEEDS

Transmission and effects of Fusarium oxysporum f. sp. vasinfectum on cotton seeds

Estudo comparativo de métodos de deslintamento de sementes de algodoeiro

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