There are a number of introduced animals within Deua National Park, including wild dogs, which sometimes stray into neighbouring properties to prey on domestic livestock. Other pest species include pigs, goats and rabbits.
Not all non-native species have a significant impact on park values and the total eradication of all of them, even if this were possible, would be too costly and might harm some native species too or damage the park in other ways. Reasonable control is the best option.
There aren't many introduced plants in Deua National Park. The species that have been of most concern and have been subject to control programs are:
- Spanish broom is actively invading forest areas along the Shoalhaven River, although it's presently limited to the Berlang Rest Area.
- Blackberries are inhibiting revegetation by native species of former grazing areas in the Bendethera Valley, restricting public access to watercourses and harbouring rabbits. They may spread further.
- Serrated tussock is confined to a few places under an intact tree canopy along the Minuma Range Fire Trail and the Bendethera Valley. It's also found in the park adjoining Khan Yunis. Any major disturbance such as intense fire or grazing promotes its spread.