Levantamento de Meloidogyne exigua na cultura da seringueira em São José do Rio Claro, MT, Brasil.

Este trabalho foi realizado com o objetivo de efetuar um levantamento da ocorrência de Meloidogyne e exigua em seringueira em São José do Rio Claro, MT. Foram amostradas 191 propriedades agríccolas, totalizando cerca de 18.000ha. Os nematóides foram identificados no Laboratório de Nematologia do Departamento de Fitossanidade da FCAV/UNESP, em Jaboticabal, SP. Foram encontrados níveis populacionais de M. exigua entre 0 e 61.824 juvenis/5g de raízes

"In vitro" effect of fungicides on mycelial growth of bipolaris maydis

Leaf spot is a disease provoked by the fungus Bipolaris maydis, that it causes great damages for annual crops, as the corn, the wheat and the  oats. Tests "in vitro" were accomplished seeking to evaluate the efficiency in the inhibition of the mycelial growth of that patogenic fungus through five fungicides: tetraconazol, tebuconazole, azoxystrobin + cyproconazole, trifloxystrobin + ropiconazole and trifloxystrobin + cyproconazole were ested fungicides. For the determination of the efficiency f the products, the daily growth of the fungus was valuated, being compared with the control. It was determined the percentage of growth inhibition. All of the treatments were effective in the inhibition of the growthof this fungus.Leaf spot is a disease provoked by the fungus Bipolaris maydis, that it causes great damages for annual crops, as the corn, the wheat and the  oats. Tests "in vitro" were accomplished seeking to evaluate the efficiency in the inhibition of the mycelial growth of that patogenic fungus through five fungicides: tetraconazol, tebuconazole, azoxystrobin + cyproconazole, trifloxystrobin + ropiconazole and trifloxystrobin + cyproconazole were ested fungicides. For the determination of the efficiency f the products, the daily growth of the fungus was valuated, being compared with the control. It was determined the percentage of growth inhibition. All of the treatments were effective in the inhibition of the growth of this fungus

A critical-point yield model to appraise the damage caused to soybean by white-mold.

Título em português: Modelo de ponto crítico para estimar os danos causados pelo Mofo-branco em soja. Artigo de acesso aberto

Eficiência de fungicidas para controle de mofo-branco (Sclerotinia sclerotiorum) em soja, na safra 2013/2014 - resultados sumarizados dos ensaios cooperativos.

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Eficiência de fungicidas multissítios e fertilizantes no controle da ferrugem asiática da soja, Phakopsora pachyrhizi, na safra 2014/15: resultados sumarizados dos ensaios cooperativos.

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Eficiência de fungicidas para o controle da ferrugem-asiática da soja, Phakopsora pachyrhizi, na safra 2013/14: resultados sumarizados dos ensaios cooperativos.

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Eficiência de fungicidas para o controle da ferrugem-asiática da soja, Phakopsora pachyrhizi, na safra 2014/15: resultados sumarizados dos ensaios cooperativos.

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Eficiência de fungicidas para controle da ferrugem asiática da soja, Phakopsora pachyrhizi, na safra 2008/09. Resultados sumarizados dos ensaios cooperativos.

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A critical-point yield model to appraise the damage caused to soybean by white-mold

A model to estimate the damage caused by white mold to soybean yield from experimental field data gathered during the summer season of 2009-10 was generated. Six soybean cultivars were grown on six sites of the Cerrados region, resulting in a total of nine separate experiments. The gradient of disease intensity (plant stem incidence) and yield was generated through the application of different fungicides and rates three times over the course of the season. The disease incidence in plant stems was evaluated at the R1, R5.2 and R5.5 growing stages. Manual harvest at the physiological ripening stage was followed by grain drying, threshing, and cleaning. Finally, grain yield was estimated in kg/ha, and regression analysis was performed. Nine linear equations representing the damage function were generated. The mean damage function was y = - 6.7 x + 1,000, where y represents grain yield normalized to 1,000 kg/ha and x represents WM incidence in plants. To appraise the damage caused by various disease intensities, these models should first be validated. Damage coefficients may be used to determine the level of economic damage.</jats:p