Pre and post-harvest diseases in mango varieties cultivated in organic system/Doencas pre e pos-colheita em variedades de manga cultivadas em sistema organico

The choice of mango variety to be used in an organic production system should be related with phytosanitary limitations, thus the objective of the present study was to evaluate the behavior of mango varieties cultivated in organic system in relation to the diseases powdery mildew, flower malformation and post harvest diseases. Seventeen mango varieties were evaluated, cultivated in organic system, planted in experimental design in randomized blocks, with 17 treatments and six repetitions. The incidence of flower malformation was determinate through the observation and count of the plants with symptoms of the disease. To evaluate the severity of malformation and powdery mildew were used scales of notes. For the characterization of the post-harvest diseases the severity of the anthracnose was visually evaluated after 1, 4, 7 and 10 days of the fruits harvest. After obtaining the data, the area under the disease progress (AUDP) was calculated. It can be concluded that the Rosa variety is very resistant to the flower malformation; the varieties Bourbon, Espada Stahl, Ataulfo and Beta can be classified as resistant and the variety Lita is the most affected for the disease among the studied varieties. The varieties Omega and Rocha can be considered as resistant to the powdery mildew and the varieties Espada Ouro de Itaparica, Imperial, Lita, Rosa and Uba are the most susceptible. The occurrence of post-harvest diseases was elevated in most of the mango varieties, being the anthracnose the most frequent one, affecting the fruits starting from the first day of storage, followed for the stem-end rot with important occurrence at the end of the storage. The varieties Bourbon Vermelha and Espada Stahl stand out for not presenting stem-end rot and smaller anthracnose severity. Index terms: Mangifera indica; powdery mildew; flower malformation; anthracnose; stem-end rot. A escolha da variedade de manga a ser plantada em sistema organico de producao deve estar relacionada com as limitacoes fitossanitarias. Assim, o objetivo do presente trabalho foi avaliar o comportamento de variedades de manga cultivadas em sistema organico frente as doencas: malformacao floral, oidio e doencas pos-colheita dos frutos. Foram avaliadas 17 variedades, cultivadas em sistema organico, plantadas em delineamento experimental em blocos completos ao acaso, com 17 tratamentos e seis repeticoes. A incidencia de malformacao floral foi determinada atraves da observacao e contagem das plantas com si