Wasmannia auropunctata, the little fire ant, an invasive specie, is a major threat to biodiversity in New Caledonia, especially in critical endangered sclerophyll forest along the west coast. In this context of high priority conservation habitat, eradication should be implemented to promote restoration of community. Here, we present the results of an eradication attempt in a 50 ha forest remnant close to the capital city Nouméa. First, we undertook a bait detection (peanut butter trapping) to map the invasion inside the forest. We defined a 9 Ha invaded area, in two distinct contaminations. Subsequently, we applied a 2 step eradication program: a first treatment was applied with an insect growth regulator bait (Distance®) to alter the larva production and then, 4 weeks later, a metabolic inhibitor bait was applied (AMDRO®) to kill workers and remaining larva. Following these treatments, we implemented a permanent baiting program. We monitored ant occurrence and density on baits to follow eradication but also to monitor side effects of the protocol on resident ants, as well as their post-treatment re-establishment. We registered a significant decrease of Wasmannia auropunctata population even if this single campaign seems unable to allow a full eradication over the whole patch. Some relictual nests remain. For other ants, the situation is contrasted according to species. We also discuss the observed patterns for future programs.