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In Field evaluation of sweet oranges and hybrids germplasm for citrus canker resistance


Asiatic citrus canker (ACC), caused by the bacterium Xanthomonas citri subsp. citri (Hasse former) Shaad et al. 2006, has its origin in Asia, from where it was spread to many parts of the world. In Brazil the disease was first recorded in 1957, in the São Paulo county of Presidente Prudente, having been kept under control in the major producing regions of the state for several decades. Recently released data indicate a high increase in number of contaminated plots, reaching the incidence in São Paulo state to 1.39% of orchards with at least one contaminated plant, level so far detected. In this context, instead of suppression strategy, the management of the disease, involving the use of windbreaks and application of cupric products, as currently done in the state of Paraná, may soon be a reality also for the state of São Paulo, being the use of less susceptible varieties a more economical and of less environmental impact alternative for its control. In this sense, this research involve the evaluation conventional management conditions for citrus canker in endemic disease conditions, of 76 sweet orange and hybrids of the IAC Citrus Germoplasm bank, also involving the comparison of methods of assessment of the genotypes reaction to the bacteria in leaves and fruit. In order to determine the potential of materials for incorporation into commercial citrus production system, it will also be evaluated characteristics of fruits for industrial use and fresh market. The experimental orchard was installed in December 2012 and in addition of genotypes with potential for greater tolerance to cancer prospected in previous research, there were also incorporates new materials obtained from hybridization and mutations induction improvement programs of Citrus Center - IAC, IAPAR and Esalq. (AU)

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