Espécies de Mycosphaerella e Teratosphaeria associadas à mancha foliar e desfolha de Eucalyptus globulus no Sul do Brasil

• Autor(a) principal: Teodoro, Marcela Galo
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4391
• topic: Teratosphaeria; Eucalyptus globulus; Desfolha; Teratosphaeria; Eucalyptus globulus; Defoliation; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE::FITOPATOLOGIA

The leaf bligh and defoliation of teratosphaeria is one of the most important leaf diseases of Eucalyptus globulus. Due to the importance of this specie for production of pulp and paper and the recent report of the leaf disease in Brazil, this study was carried out aiming the identification of the pathogen in Santa Catarina and Rio Grande do Sul and to test the mycelial growth and sporulation of the fungus under different culture media. The following species were identified: Mycosphaerella scytalidii, M. lateralis, Teratosphaeria ohnowa, T. perpendicularis, T. pseudafricana, T. flexuosa and T. nubilosa. Based on ascospore germination patterns, more than one species of the fungus was found concurrently in a single lesion or in a single leaf. Slow growth and lack of sporulation of the fungus species are limiting factors for the production of inoculum to be used in inoculation under controlled conditions. Thus in the second phase of this study, we tested the mycelial growth and sporulation of the identified cultures in several culture media. Mycosphaerella scytaliddi, Teratosphaeria ohnowa and Teratosphaeria flexuosa presented a higher growth rate in coconut water-agar (CWA), malt extract-agar (MEA), potato- dextroseagar (PDA), mycophil-ágar (MA), and oatmeal-sacarose-agar (OSA); Teratosphaeria nubilosa presented higher growth rate in PDA, OSA, and MEA. No sporulation was obtained for all species tested.