During the rainy season, three releases of Neochetina spp. were performed in 10 sites around the infested area, one in September (1720 N. bruchi and 1280 N. eichhorniae), another in October (1700 N. bruchi and 1000 N. eichhorniae) and the last one in November (2850 N. bruchi and 1250 N. eichhorniae). A total amount of 9800 insects were released