Nonlinear models for describing the Citrus Variegated Chlorosis in groves of two counties at northwestern Paraná state, Brazil - doi: 10.4025/actasciagron.v32i4.11625

Clara Matiko Ueda; Akemi Yamagata Yamamoto; William Mário de Carvalho Nunes; Carlos Alberto Scapim; Terezinha Aparecida Guedes

doi:10.4025/actasciagron.v32i4.11625

Nonlinear models for describing the Citrus Variegated Chlorosis in groves of two counties at northwestern Paraná state, Brazil - doi: 10.4025/actasciagron.v32i4.11625

Clara Matiko Ueda UEM
Akemi Yamagata Yamamoto UEM
William Mário de Carvalho Nunes UEM
Carlos Alberto Scapim UEM
Terezinha Aparecida Guedes UEM

DOI: https://doi.org/10.4025/actasciagron.v32i4.11625

Keywords: growth curves, nonlinear models, Citrus Variegated Chlorosi.

Abstract

In Brazil, the production of sweet oranges has been threatened by the Citrus Variegated Chlorosis (CVC) incited by the gram-negative bacterium Xylella fastidiosa (Wells). Commercial citrus groves in two counties at the Northwestern Paraná state were evaluated to estimate the disease progression by using parameterizations of nonlinear models. Groves of Citrus sinensis Osbeck, variety “Pêra”, “Valência”, “Natal” and “Folha Murcha” had all the plants evaluated for the presence of disease symptoms. Thereafter, different parameterizations of the Logistic and Gompertz models were fitted to these data. The goodness of fit was evaluated by the intrinsic (IN) and parameter-effects (PE) curvatures of Bates and Watts, the bias of Box and the Hougaard measures of skewness. In Loanda, the best model was the Fermi-Dirac, and in Nova Esperança the data were best fitted to the parameterization L⁵, which is also a parameterization from the Logistic model.

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Author Biography

William Mário de Carvalho Nunes, UEM

Concluiu o doutorado em Agronomia (Proteção de Plantas) [Botucatu] pela Universidade Estadual Paulista Júlio de Mesquita Filho em 1999. Atualmente é Professor da Fundação Universidade Estadual de Maringá. Publicou 56 artigos em periódicos especializados e 67 trabalhos em anais de eventos. Possui 5 itens de produção técnica. Participou de 6 eventos no Brasil. Orientou 3 dissertações de mestrado e co-orientou 6, co-orientou 2 teses de doutorado, além de ter orientado 4 trabalhos de iniciação científica e 6 trabalhos de conclusão de curso nas áreas de Agronomia e Genética. Recebeu 3 prêmios e/ou homenagens. Atualmente coordena 2 projetos de pesquisa. Atua na área de Agronomia, com ênfase em Fitopatologia. Em suas atividades profissionais interagiu com 136 colaboradores em co-autorias de trabalhos científicos. Em seu currículo Lattes os termos mais freqüentes na contextualização da produção científica, tecnológica e artístico-cultural são: epidemiologia, Xylella fastidiosa, ctv, cvc, citrus, sscp, fitopatologia, xanthomonas axonopodis pv. citri, antracnose e elisa. Currículo Lattes

Published

2010-11-29

How to Cite

Ueda, C. M., Yamamoto, A. Y., 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 - doi: 10.4025/actasciagron.v32i4.11625. Acta Scientiarum. Agronomy, 32(4), 603-611. https://doi.org/10.4025/actasciagron.v32i4.11625

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Issue

Vol 32 No 4 (2010)

Section

Crop Protection

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