Temporal and spatial characterization of alternaria leaf bligth of carrot
DOI:
https://doi.org/10.19180/1809-2667.v22n12020p92-99Keywords:
Daucus carota, Epidemiology, Alternaria dauciAbstract
The Alternaria leaf blight of carrot (Alternaria dauci (Kühn) Groves & Skolko) is the main disease and has compromised crop productivity. As the epidemiology of the disease in Brazil is unknown, the objective of this work was to characterize the temporal and spatial progression of this disease in the cultivation conditions in the southern region of Brazil. Carrot seeds of Brasília cultivar were sown in four blocks of 270 plants each. The initial incidence of the disease in the planting line was used for the spatial analysis through the run and doublet tests and its results analyzed by the value (± 1.64) standardized in the Z test at 5% probability. The severity of the disease was analyzed in 120 plants through a diagrammatic scale in 120 previously demarcated random plants and the severity data were adjusted to a nonlinear model throughout the cycle of culture. It was found that the spatial pattern of the disease was over 99% at random for both tests. The disease progress curve was fitted to the Gompertz model, represented by y=0.253356*(exp(29.59929*exp(- 0.69466*x))). This study will serve as a model for work related to the disease.Downloads
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