Dinâmica espaço-temporal da murcha de Ceratocystis em Mangifera indica e associação da doença a potenciais vetores

• Ano de defesa: 2014
• Autor(a) principal: Moraes, Wanderson Bucker
• Orientador(a): Maffia, Luiz Antônio
• Banca de defesa: Santos, Gérson Rodrigues dos , Silva, Fabyano Fonseca e , Souza, André Gomes Coelho de , Alfenas, Acelino Couto
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Fitopatologia
• Departamento: Etiologia; Epidemiologia; Controle
• País: BR
• Palavras-chave em Português: Ceratocystis fimbriata; Murcha-de-Ceratocystis - Epidemiologia; Mangueira - Doenças e pragas
• Palavras-chave em Inglês: Ceratocystis fimbriata; Wilt of-Ceratocystis - Epidemiology; Hose - Diseases and pests
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE::FITOPATOLOGIA
• Link de acesso: http://locus.ufv.br/handle/123456789/4429

Ceratocystis wilt, caused by Ceratocystis fimbriata, is a destructive mango disease, and its epidemiology is poorly understood. The objective of the study was to describe the spatio-temporal dynamics of Ceratocystis wilt, and its association with beetles and termites in two producing regions. Epidemics of Ceratocystis wilt were followed over fifteen months in five plots, two in Itaocara RJ (A1RJ and A2RJ) and three in Frutal MG (A1MG, A2MG, and A3MG). The logistic, Gompertz, and monomolecular models were fitted to monthly data of incidence, severity, and plant death through Bayesian analysis. The best goodness of fit was with the Gompertz model. The marginal posterior distribution of the A2RJ epidemic had higher values of incidence rate, whereas the distributions of the A1RJ, A1MG, A2MG, and A3MG epidemics did not differ. Lower values of severity and mortality rate were observed in the marginal posterior distribution of the Itaocara epidemics, and there were no differences between the distributions of the Frutal epidemics. The pattern of occurrence of the disease in each plant also differed between the regions. When the disease was first detected, the severity values in each plant in Itaocara varied from 0.1 to 60%, whereas the severity value in Frutal was always 100%. In Itaocara, it took longer for the diseased plants to die than in Frutal. With respect to spatial dynamics, in Itaocara were observed maximum values of intensity of disease in foci and intermediate values in different locations of the plots, while in Frutal the disease was grouped into foci of increased intensity and progressed only in those places. In Itaocara, the disease was randomly spread from initial foci to more distant, while in Frutal spread of aggregate form for healthy plants neighboring. There was no spatial association of the disease with termites in the all plots, but there was spatial association of the disease and beetles the early stages of the disease in A1RJ and A2RJ, and the later stages in the A1MG e A2MG plots. Thus, it was concluded that the spatio-temporal dynamics of Ceratocystis wilt in Itaocara and Frutal differed most likely because of differences regarding the initial inoculum and pathogen dispersal.