Tolerância de laranjeiras-doce à tristeza dos citros em combinações com diferentes porta-enxertos no extremo sul da Bahia

• Ano de defesa: 2025
• Autor(a) principal: Holtz, Filipe Garcia
• Orientador(a): Zucoloto, Moisés
• Banca de defesa: Tomaz, Marcelo Antonio , Barbosa, Dimmy Herllen Silveira Gomes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; Mestrado em Agronomia
• Programa de Pós-Graduação: Programa de Pós-Graduação em Agronomia
• Departamento: Centro de Ciências Agrárias e Engenharias
• País: BR
• Palavras-chave em Português: Citrus; Citricultura; Manejo fitossanitário; Porta-enxertos tolerantes; Citriculture; Phytosanitary management; Tolerant rootstocks
• Área do conhecimento CNPq: Agronomia
• Link de acesso: http://repositorio.ufes.br/handle/10/20747

The Citrus tristeza disease (CTV) is a highly destructive viral disease that harms production by causing stunted and chlorotic plants or inducing rapid plant death. Disease management is mainly carried out through the use of tolerant rootstocks; however, the narrow genetic base of seedlings available on the market necessitates new studies. The objective of this research was to assess the tolerance of different sweet orange scion and rootstock combinations to CTV. A total of 59 sweet orange scions were evaluated in combination with the rootstocks 'Sunki Tropical,' 'San Diego,' 'Riverside,' and 'Indio.' Twenty branches from each combination were collected, the bark was removed in the laboratory, and symptom intensity was assessed using a scale ranging from 1 to 2 for low intensity, 3 for intermediate intensity, and 4 to 5 for high intensity. Many combinations with the rootstocks 'Sunki Tropical' and 'San Diego' showed more intense fluting symptoms, but in a low scale, whereas the rootstocks 'Riverside' and 'Indio' showed lower intensity, including combinations without fluting, even with the variety 'Pera', which is known to be intolerant to the disease. Under the conditions studied, the rootstocks were efficient giving tolerance to CTV to the sweet orange scions, with a highlight to the selections ‘Riverside’ and ‘Indio’, which doesn’t show strong symptoms. This data is supported by the production data, where even susceptible cultivars such as the ‘Pera’ selections, presented higher production, above average production for the harvest 2024/25.