Mango-blight in Campinas is caused by Ceratostomella fimbriata. When green parts of branches of healthy mango plants were inoculated with cultures of the tungus, blight appeared after 10-15 days and the rotten tissues were colonized by Hypothenemus plumeriae, an insect closely related to the caffee-borer. The insect may or may not be a vector of the disease when opening galleries in healthy branches. The disease seems to be identical to the "mal do Recife" (4). Perithecia are produced in diseased tissues. Asei of the fungus are provided with a delicate, evanescent wall. There is no endogenous wall in the asci as claimed by Andrus and Harrer (2). Protoperithecia when crushed under a cover-slip in a drop of eosin show eosinophil asci with a clear cut wall, and four 2-septate ascospores.