Citric acid
When it comes to using chemicals, only a few are legal. Citric acid can be legally used in Hawaii but the chemical must directly contact with coquíes, perhaps even multiple times. However, the citric acid may adversely impact plants and cause unseemly spots. Other substances that are used to control the species is hydrated lime and caffeine. Eradication techniques include hand capture and spraying with a 12% solution of citric acid along with a certification program for nurseries to prevent them from acting as centers of contagion.