Study of secondary effects coming from application of systemic fungicides in drybeans (Phaseolus vulgaris) / Análise dos efeitos secundários decorrentes da aplicação de fungicidas sistêmicos à cultura do feijoeiro (Phaseolus vulgaris)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

When systemic fungicides were incorporated to plant disease management strategies, two things started to happen: there was an increase in efficacy of diseases control, because these fungicides have longer lasting effect and some curative power, and some physiological effects caused by these fungicides started being related. Actually, many articles describe and measure physiologic effects caused by different fungicides in many plants. Most of these studies are carried out under very intensive conditions such as potted plants in greenhouses. Only few of them give clear information on disease severity in field trials, or disease control achieved by the fungicides. It is not easy to understand how important these physiologic effects are when selecting fungicides to be used in programs for disease management. But there is a lot of promotion material claiming that different fungicides promote physiologic effects that can benefit many crops, offering it as a factor to be taken into account when selecting products to be used in disease management programs. The objective of this work was to quantify as many changes as possible in the dry beans crop after the field use (as closest as possible to commercial conditions) of different fungicides, systemic and not systemic, separating those changes that could come from disease control from those that could only come from physiological effects. Results showed that under field conditions, some significant changes (photosynthesis, stomatal conductance, leaf retention, yield) were measured in the crop, but all of them could be well explained by the disease control given by the fungicides. Conclusion is that the capacity to induce physiologic effects on plants should not be considered as a critical factor to select a fungicide to be used in disease management programs by dry beans growers. For this purpose, the main driver should be the efficacy of the fungicide to control the most important diseases threatening that crop.

ASSUNTO(S)

dry beans - physiology fungicidas - efeitos biológicos. fungicides - biologic effects feijão - fisiologia lpant diseases -control doenças de plantas - controle

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