Interações entre o patógeno dos citros Candidatus Phytoplasma aurantifolia e vetores hemípteros

• Ano de defesa: 2014
• Autor(a) principal: Queiroz, Renan Batista
• Orientador(a): Elliot, Simon Luke
• Banca de defesa: Guedes, Raul Narciso Carvalho , Ponte, Emerson Medeiros Del , Guerra Sobrinho, Tathiana
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Entomologia
• Departamento: Ciência entomológica; Tecnologia entomológica
• País: BR
• Palavras-chave em Português: Limão - Controle de pragas; Citrus aurantifolia; Diaphorina citri; Fitoplasma; Bactérias fitopatogênicas
• Palavras-chave em Inglês: Lemon - Pest control; Citrus aurantifolia; Diaphorina citri; Phytoplasma; Phytopathogenic bacteria
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE::ENTOMOLOGIA AGRICOLA
• Link de acesso: http://locus.ufv.br/handle/123456789/930

The main goal was to obtain the information and tools necessary to implement control measures against Witches‟ Broom Disease of Lime (WBDL), disease caused by Candidatus Phytoplasma aurantifolia‟ in Oman, examining in particular the role of vectors. We consider phytoplasmas of acid lime (Citrus aurantifolia) in Brazil and in Oman, that are closely related yet that have very different symptomatology in Brazil, the infected plants are asymptomatic while in Oman and the Middle East in general, the symptoms are apparent and represent a severe threat to the citrus industry. In both cases, infection of Citrus aurantifolia plants by Ca. Phytoplasma aurantifolia‟ had a positive effect on the vector Diaphorina citri, as is expected for pathogens transmitted in a persistent manner. This was based on a study of the population growth and reproductive capacity using parameters obtained from fertility life tables, which are an important aid for understanding the insect‟s population growth. The intrinsic rate of increase (r m ) of this insect was almost doubled on phytoplasma-infected plants than uninfected plants. The increase was due to a tripling of oviposition rates, while generation and survival times were unaffected. Furthermore, we also investigated several aspects of this system in Oman. We identified two species, Diaphorina citri and Hishimonus phycitis, as insect vectors of 'Ca Phytoplasma aurantifolia ' and found both species to be present in the field all year round, in four field sites. Finally, we identified two alternative host plants of this phytoplasma in Oman.