Nonlinear models for describing the Citrus Variegated Chlorosis in groves of two counties at northwestern Paraná state, Brazil

  • Ueda C
  • Nunes W
  • Scapim C
  • et al.
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Abstract

In Brazil, the production of sweet oranges has been threatened by the<br />Citrus Variegated Chlorosis (CVC) incited by the gram-negative bacterium<br />Xylella fastidiosa (Wells). Commercial citrus groves in two counties at<br />the Northwestern Parana state were evaluated to estimate the disease<br />progression by using parameterizations of nonlinear models. Groves of<br />Citrus sinensis Osbeck, variety ``Pera{''}, ``Valencia{''}, ``Natal{''}<br />and ``Folha Murcha{''} had all the plants evaluated for the presence of<br />disease symptoms. Thereafter, different parameterizations of the<br />Logistic and Gompertz models were fitted to these data. The goodness of<br />fit was evaluated by the intrinsic (IN) and parameter-effects (PE)<br />curvatures of Bates and Watts, the bias of Box and the Hougaard measures<br />of skewness. In Loanda, the best model was the Fermi-Dirac, and in Nova<br />Esperanca the data were best fitted to the parameterization L(5), which<br />is also a parameterization from the Logistic model.

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Ueda, C. M., Nunes, W. M. de C., Scapim, C. A., & Guedes, T. A. (2010). Nonlinear models for describing the Citrus Variegated Chlorosis in groves of two counties at northwestern Paraná state, Brazil. Acta Scientiarum. Agronomy, 32(4). https://doi.org/10.4025/actasciagron.v32i4.11625

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