There is not extensive research on the population numbers or demography for Common Diuca-finch. 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) describe 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", and there is no evidence of decline or substantial threats (BirdLife International 2015). Known parasites on nestlings include the subcutaneous larvae of a Philornis sp. (Diptera, Muscidae), which specializes on birds (Mezquida 2003). It also is parasitized by the mite Harpyrhynchoides zumpti (Bochkov and Galloway 2001).