Ocorrência de Bipolaris maydis causando mancha foliar em Paspalum atratum cv. Pojuca no Brasil

Anjos, J. R. N. dos; Charchar, M. J. A.; Teixeira, Rogério N.; Anjos, S. S. N. dos

doi:10.1590/s0100-41582004000600010

Cited by 11 publications

(9 citation statements)

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“…The symptoms were evaluated five, 10, 15 and 20 days after the inoculation. Compared to Anjos et al (2004), the leaves with symptoms were isolated, in PDA media, after the last symptoms evaluation, 20 days after the inoculation in order to confirm Koch's principles. To satisfy the seedlings' need for nutrients, they were fertilized with urea (5 g/L) 20 days after the emergence.…”

Section: Assay II -Pathogenicitymentioning

confidence: 99%

Sanitary analysis, transmission and pathogenicity of fungi associated with forage plant seeds in tropical regions of Brazil

et al. 2014

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-Brazil is a major producer and exporter of beef in the world, 90% of the production is made in pasture and 85% of cultivated pastures in the country are Brachiaria sp. With a growing livestock industry in the recent years, several forage plant diseases became significant importance for causing losses in pasture productivity and quality. This study aims at quantifying the species of fungi associated with seeds and their frequency in forage plants from tropical regions of Brazil. Assays were performed considering: incidence, pathogenicity and seed-seedling transmission of fungi associated with seeds. Therefore, 28 lots of forage species seeds produced in the harvest of 2010-2011 were used. Fourteen genera of fungi associated with seeds were found, among which Bipolaris sp., Phoma sp., and Curvularia sp. had pathogenic potential. It was possible to note that Bipolaris sp., is prejudicial to forage seedlings of Brachiaria, Panicum and Crotalaria. Bipolaris sp. and Curvularia sp. have an average of seed-seedling transmission of 100% and 90%, respectively.

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Section: Assay II -Pathogenicitymentioning

confidence: 99%

Sanitary analysis, transmission and pathogenicity of fungi associated with forage plant seeds in tropical regions of Brazil

et al. 2014

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“…They include Bipolaris, which causes foliar diseases in rice (Celmer et al, 2007) and damage in the grass, Paspalum atratum cv. Pojuca (Anjos et al, 2004) and fungi of the genus Fusarium,, which is a disease agent in various hosts (Sala et al, 2006;Dias and Toledo, 1993), including castor bean. In general, the treatment with the biological product did not inhibit the growth of fungus species, including some, such as Fusarium (Silva et al, 2005), which are very important for castor bean, principally the AL Guarany 2002 cultivar (Table 5).…”

Section: Resultsmentioning

confidence: 99%

Chemical and biological treatments of castor bean seeds: effects on germination, emergence and associated microorganisms

Marroni¹,

Moura²,

Ueno³

2012

Rev. bras. sementes

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RESUMO -Avaliou-se o efeito dos tratamentos químicos e biológicos sobre a emergência, vigor de plântulas de mamona, produção de matéria seca, além do controle de microrganismos associados às sementes das cultivares AL Guarany 2002 e Lyra. Os produtos testados foram carbendazim+thiram, carboxin+thiram e um à base de Trichoderma. A emergência total e de plântulas foram avaliadas aos 27 dias após a semeadura e a produção de matéria seca, com plantas retiradas 45 dias após a semeadura. A cv. AL Guarany 2002 apresentou maior incidência de microrganismos em relação à cv. Lyra. O tratamento químico foi 100% eficiente no controle de fungos e o tratamento biológico não reduziu a incidência de microrganismos nas sementes. O tratamento químico resultou em plantas com maior matéria seca e os melhores resultados foram para carbendazim + thiram e carboxin+ thiram, nas doses de 60 g + 140 g e 50 g + 50 g/100 kg de sementes, respectivamente. O carbendazim + thiram foi o único tratamento que se mostrou estatisticamente superior, quanto ao índice de emergência total, enquanto que o tratamento biológico aumentou os valores de emergência somente na cv. Lyra, evidenciando sua inferioridade. Destacou-se a importância dos fungicidas para o controle de patógenos associados às sementes.Termos para indexação: Ricinus communis, fungicidas, teste de papel filtro, Trichoderma.ABSTRACT -The effect of chemical and biological treatments on castor bean emergence, seedling vigor, dry matter production, and also the control of microorganisms associated with seeds of the AL Guarany 2002 and Lyra cultivars, was evaluated. The products tested were carbendazim + thiram, carboxin + thiram and a product based on Trichoderma. Total seed and seedling emergence were evaluated at 27 days after sowing whereas dry matter production was verified for plants removed 45 days after sowing. The Guarany 2002 AL cultivar had a higher incidence of microorganisms than the Lyra cultivar. The chemical treatment was 100% effective in controlling fungi but the biological treatment did not reduce microorganism incidence on the seeds. Chemical treatment resulted in plants with more dry matter and the best results were for carbendazim + thiram and carboxin + thiram at doses of 60 g + 140 g and 50 g + 50 g/100 kg of seeds, respectively. The carbendazim + thiram mixture was the only treatment which was statistically higher for total emergence whereas the biological treatment increased emergence only for the Lyra cultivar, thus demonstrating its lower efficiency. The importance of fungicides to control pathogens associated with seeds was discussed.

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“…Asterisco indica significância a P<0,05 (*). Anjos et al (2004), relatando a ocorrência de B. maydis causando mancha foliar na gramínea forrageira Paspalum atratum cv. Pojuca no Brasil, citam que as lesões necróticas nas folhas causaram danos consideráveis, com redução da área fotossintética e perdas de produção de massa verde e de sementes.…”

Section: Peso Da Matéria Fresca E Porcentagem De Matéria Secaunclassified

Dano causado por Bipolaris maydis em Panicum maximum cv. Tanzânia

2010

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ResumoO objetivo deste trabalho foi avaliar o dano causado por Bipolaris maydis (helmintosporiose) na quantidade e qualidade da produção do capim Tanzânia. Plantas de capim Tanzânia foram cultivadas em vasos de tubos de PVC (50 cm de altura x 15 cm de diâmetro) contendo mistura solo/areia (3:1). As plantas foram inoculadas com suspensões de esporos do patógeno com diferentes concentrações (10 2 , 10 4 e 10 6 conídios/mL), visando obter gradiente de severidade de manchas foliares. Foram realizadas avaliações semanais da severidade e do número de perfilhos. Após quatro semanas avaliou-se o peso da matéria fresca de folhas (MF), porcentagem de matéria seca (PMS), de proteína bruta (PB), de fibra em detergente neutro (FDN) e de fibra em detergente ácido (FDA). A doença reduziu significativamente o perfilhamento e MF a partir da segunda avaliação (P < 0,05). Não houve correlação significativa entre as variáveis PMS, FDA e área abaixo da curva de progresso da doença (AACPD). No entanto, houve correlação positiva (P < 0,01) e negativa (P <0 ,05) entre PB e FDN, respectivamente, com a AACPD, como possível resultado da atividade do patógeno. Estes resultados indicam que B. maydis inibe o desenvolvimento do capim Tanzânia e promove alteração na qualidade da forragem. Palavras-chave: Mancha foliar, helmintosporiose, função de dano AbstractThe aim of this research was to evaluate the damage caused by Bipolaris maydis in the quantity and quality of the Tanzania grass production. Tanzania grass plants were cultivated in pots of PVC tubes (50 cm of height x 15 cm of diameter) containing a mixture of soil and sand (3:1). The plants were inoculated with spore pathogen suspension containing 10 2 , 10 4 and 10 6 conidia/mL to obtain different levels of disease. Severity and number of tillers were evaluated weekly. After four weeks, it were evaluated the weight of the fresh matter of leaves (FM), percentage of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF). The disease reduced significantly the plant tillering and FM after the second evaluation (P < 0.05). There was no significant correlation among the variables DM, ADF, and the area under disease progress curve (AUDPC). However, there were positive (P < 0.01) and negative (P < 0.05) correlations among CP and NDF, respectively, with AUDPC, as possible result of the activity of the pathogen. These results showed that B. maydis inhibits the development of the Tanzania grass and promotes alteration in the quality of the forage.

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Ocorrência de Bipolaris maydis causando mancha foliar em Paspalum atratum cv. Pojuca no Brasil

Cited by 11 publications

References 0 publications

Sanitary analysis, transmission and pathogenicity of fungi associated with forage plant seeds in tropical regions of Brazil

Sanitary analysis, transmission and pathogenicity of fungi associated with forage plant seeds in tropical regions of Brazil

Chemical and biological treatments of castor bean seeds: effects on germination, emergence and associated microorganisms

Dano causado por Bipolaris maydis em Panicum maximum cv. Tanzânia

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