Qualidade sanitária de sementes de milho em diferentes estádios de maturação

Henning, Fernado Augusto; Mertz, Liliane Márcia; Peske, Silmar Teichert

doi:10.1590/s0101-31222011000200014

Cited by 25 publications

(28 citation statements)

References 12 publications

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“…Com relação a F. verticillioides, o contato das sementes com as estruturas dos fungos proporcionou pico de 18% de contaminação, após 25, 24 e 27 horas, respectivamente para os híbridos H8480, H657 e H577 (Figura 2b Várias pesquisas demonstraram que esses fungos não afetam a germinação de sementes de milho (Moraes et al 2003, Cappelini et al 2005, Henning et al 2011, Solorzano & Malvick 2011. Todavia, a redução na germinação de sementes de milho infectadas por F. verticillioides é possível, pois este fungo apresenta crescimento rápido e agressivo, e pode causar a morte das sementes antes mesmo da germinação (Antonello et al 2009).…”

Section: Resultsunclassified

Infecção por Fusarium graminearum e Fusarium verticillioides em sementes de milho

Ramos

Barbosa

Vieira

et al. 2014

Pesqui. Agropecu. Trop.

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INTRODUÇÃOA semente é o principal insumo agrícola, uma vez que transporta para o campo todo o potencial genético da espécie, e, para que este se expresse, é necessário, dentre outros fatores, que a semente possua elevado potencial fisiológico e ausência de patógenos.Sementes de milho são susceptíveis a diversos fungos prejudiciais, durante as diferentes fases de produção, principalmente durante o estabelecimento ABSTRACT RESUMO da cultura, e estes ocasionam redução na população de plantas e enfraquecimento de plântulas, durante as etapas iniciais de seu desenvolvimento (Cappelini et al. 2005). Algumas espécies do gênero Fusarium têm sido associadas a doenças do milho, como Fusarium graminearum Schwabe (teleomorfo, Gibberella zeae (Scw.) Petch) e Fusarium verticillioides (Sacc.) Nirenberg (sinônimo, Fusarium moniliforme Sheldon; teleomorfo, Gibberella moniliformes, si-1. Trabalho recebido em fev./2013 e aceito para publicação em jan./2014 (nº registro: PAT 22694).

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Section: Resultsunclassified

Infecção por Fusarium graminearum e Fusarium verticillioides em sementes de milho

Ramos

Barbosa

Vieira

et al. 2014

Pesqui. Agropecu. Trop.

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“…The relationship between the maturity length of a maize hybrid and its GDD accumulations at a given location determine their optimal harvesting period and its adaptability. Intensively studies have been carried out on the effect of harvesting stages on maize yield and agreed that the optimal time to harvest maize is when close to its physiological maturity (Daynard, 1972;Henning et al, 2011;Jacob Junior et al, 2014). However, consideration was not even under extreme or adverse weather conditions which may prevent the crop from attaining physiological maturity.…”

Section: Introductionmentioning

confidence: 99%

Planting Dates and Harvesting Stages Influence on Maize Yield under Rain-Fed Conditions

Adelabu¹,

Modi²

2017

JAS

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Understanding the challenges associated with variation in weather conditions and stages of maturity in maize are essential for farmers to achieve continuous production under climate changes. This research evaluated the interactive effect of planting date and stages of maturity at harvest on maize yield (Zea mays L.). Field trials were conducted during the 2014/15 and 2015/16 seasons at university of KwaZulu-Natal research farm Pietermaritzburg South Africa. Planting dates comprised of early (November), mid (December) and late planting dates (January). While, harvesting occurred at milk stage, dent stage and physiological maturity. A split plotdesign with four replications was used. The main plot and sub-plot consisted of planting dates and harvesting stages respectively. Response of maize to planting dates and harvesting stages was determined by variables of plant physiological growth and yield parameters. Significant differences in growth and physiological parameters were more obvious in 2015/16 season which was a drier season than 2014/15. Early and mid-planting had positive effect on parameters measured at both seasons. However, mid planting date favoured maize growth and yield more in drier season. The interaction of planting dates and harvesting stages significantly influenced grain yield, thousand seed weight, ear length and diameter. Thousand seed weight, ear length and diameter obtained at dent stage under mid planting outperformed its counterpart from physiological maturity under which late planting. With the increase in climate variability there is high risk that maize planted lately would have lower yield irrespective of its planting dates and might not attain physiological maturity. However, maize harvested at dent stage under early and mid-planting dates gave substantially high yield.

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“…Manual collection leads to less damage to the ear, as well as manual shelling; however, the yield from harvest is very low, requiring a great deal of labor, which increases costs, and it is more appropriate for small properties and highly sloped land (Pimentel and Fonseca, 2011). Delayed harvest may lead to losses in the physiological quality and health of the seeds; therefore, harvest should occur at the appropriate time, as near as possible to physiological maturity, for maximum reduction of possible losses (Henning et al, 2011), and this is only made viable in a technical way through harvest in the ear. Mechanical harvest may be made by removing the ears with husk, the ears without husk, or the material already shelled from the field.…”

Section: Introductionmentioning

confidence: 99%

Physiological performance during storage of corn seed treated with insecticides and fungicide

Deuner¹,

Rosa

Meneghello³

et al. 2014

J. Seed Sci.

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-The goal of storage is to maintain the characteristics that seeds have immediately after processing; however, when this is over longer periods, storage may cause loss in quality. The aim of this study was to evaluate the effect of treatment with insecticide and fungicide on corn seeds harvested in kernel form and in the ear over the time of storage in two environments for 360 days. The seeds were subjected to the following treatments: T1 -control; T2 -Deltamethrin + Pirimiphosmethyl + Fludioxonil; T3 -Deltamethrin + Pirimiphos-methyl + Fludioxonil + Thiamethoxam; T4 -Thiamethoxam, and T5 -Fenitrothion. They were then placed in paper bags and stored in two environments, in a cold room with an average temperature of 16 °C and RH of 60% and in a non-controlled environment (an average room temperature of 25 ºC and RH of 70%) located in the municipality of Pelotas, RS, Brazil. Every four months (0, 120, 240 and 360 days), seed germination and vigor was evaluated by the first count of germination test and cold test. Reduction in germination and vigor of corn seeds, conditioned by the insecticides and fungicide used in the seed treatment, vary according to the product and the time over which the seeds remain stored. The seeds harvested in the ear show lower loss of physiological quality than those harvested in kernel form.Index terms: Zea mays L., germination, vigor, seed treatment.Desempenho fisiológico durante o armazenamento de sementes de milho tratadas com inseticidas e fungicida RESUMO -O armazenamento tem por objetivo manter as características que as sementes possuem imediatamente após o beneficiamento, porém, quando por períodos mais extensos, o mesmo pode causar perdas na qualidade das mesmas. O objetivo neste trabalho foi avaliar o efeito do tratamento com inseticida e fungicida sobre sementes de milho colhidas a granel e em espiga durante o armazenamento em dois ambientes por 360 dias. As sementes foram submetidas aos tratamentos: T1-testemunha; T2-Deltamethrin + Pirimifós-metílico + Fludioxonil; T3-Deltamethrin +Pirimifós-metílico + Fludioxonil + Tiametoxam; T4-Tiametoxam e T5-Fenitrothion. Em seguida, foram acondicionadas em sacos de papel e armazenadas em dois ambientes: câmara fria com temperatura média de 16 °C e UR de 60% e em ambiente não controlado (câmara com temperatura média de 25 ºC e UR de 70%, localizada no município de Pelotas-RS). A cada quatro meses (0; 120; 240 e 360 dias) foi avaliada a germinação e o vigor das sementes, pelos testes de primeira contagem de germinação e teste de frio. A redução da germinação e do vigor de sementes de milho, condicionada pelos inseticidas e fungicida utilizados no tratamento das sementes, varia em função do produto e do tempo em que as sementes permanecem armazenadas. As sementes colhidas em espiga apresentam menor perda da qualidade fisiológica em relação às colhidas a granel.Termos para indexação: Zea mays L., germinação, vigor, tratamento de sementes.1

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Qualidade sanitária de sementes de milho em diferentes estádios de maturação

Cited by 25 publications

References 12 publications

Infecção por Fusarium graminearum e Fusarium verticillioides em sementes de milho

Infecção por Fusarium graminearum e Fusarium verticillioides em sementes de milho

Planting Dates and Harvesting Stages Influence on Maize Yield under Rain-Fed Conditions

Physiological performance during storage of corn seed treated with insecticides and fungicide

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