There is not extensive research on the population numbers or demography for Diuca diuca. Generation length is estimated to be 3.8 years, but there is not strong supportive evidence for this (BirdLife International 2015). Parker et al. (1996) describes the Common Diuca-Finch as “common” compared to other Neotropical birds with a center of abundance in the lower subtropical zone. They are also described as “relatively abundant” with no evidence of decline or considerable threats (BirdLife International 2015). Known parasites on nestlings include the subcutaneous larvae of a Philornis sp. (Diptera, Muscidae), which specialize on birds (Mezquida 2003). They are also known to be parasitized by the mite Harpyrhynchoides zumpti (Bochkov and Galloway 2001). As high as 61% of Diuca diuca nests have been found to be parasitized by the Shiny Cowbird (Molothrus bonariensis) (Johnson and Goodall 1967, cited in King 1973).