Quantificação de danos e perdas causados pela giberela do trigo
Resumen
The culture of wheat is of great importance to Brazil and the world. Wheat productivity
can be affected by several factors, with diseases playing a major role Among the
diseases, giberella stands out (Fusarium graminearum), that can not only lead to
reduced yields but can also greatly affect grain quality due to the production of
mycotoxins, which represent an enormous risk to human and animal health. The
management of the disease is an enormous challenge for the world's triticulture, and
is normally done using fungicides, cultivars with a certain level of resistance to the
disease and cultural management practices. However, there are costs associated with
the use of each management strategy. There is still a lack of scientific information on
the damage (reduction in yield quantity and/or quality) and losses (reduction in financial
return due to disease) caused by the disease under different management strategies.
The aim of this work was to quantify the damage and losses caused by the disease in
8 management strategies (involving genetic resistance, application or not of fungicide
and use or not of silicium (in the form of potassium silicate), under irrigated and rainfed
cultivation conditions. The analysis involved the determination of wheat yield, total crop
costs, and cost-effectiveness. Planting wheat with irrigation provided the best overall
performance. The best cost-effective management of Fusarium graminearum was
obtained by integrating the cultivar LG ORO with fungicide application, which provided
a 30.77% reduction in disease incidence, a 20% increase in productivity, and a positive
balance of R$ 7.319,66 over the control treatment. The results of this study lead to the
conclusion that the choice of Fusarium graminearum management strategy affects the
cost of production, making a cost-effective analysis necessary to decide on the best
strategy to be adopted. Determining the damage and losses caused by the disease
under different management strategies is a prerequisite for defining a rational strategy
for economical management of Fusarium Head Blight in wheat.
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