Efficacy of ant repellent herbal chalk from galangal extract

This study aimed to evaluate the efficacy of herbal chalk containing galangal extract for repelling Monomorium pharaonic (pharaoh ants) and to determine the optimal distance for chalk application. The herbal chalk with concentrations of 5% w/v, 10% w/v, and 15% w/v was tested and compared with a positive control containing 12% w/w DEET and a negative control containing distilled water. The 15% w/v concentration demonstrated 100% repellency. Field tests confirmed effectiveness, and satisfaction results from 82 users showed high acceptance.