Efficacy of ant repellent herbal chalk from galangal extract
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Abstract
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 results indicated that the positive control chalk exhibited a repellent efficacy of 100% (%Repellency=100), while the negative control exhibited failure to repel ant (%Repellency=0). The 15% w/v concentration of galangal extract demonstrated the highest efficacy in repelling ants (%Repellency=100) among the herbal chalk formulations with the optimal distance for chalk application of 5 cm and 10 cm from the bait, respectively. For the 15% w/v concentration, the average distance and time at which ants approached the bait most frequently were observed at a distance of 5 cm and at 45 minutes. A field test was conducted in Bang Phli District, Samut Prakan Province, and found that when the herbal chalk was applied across ant trails, there was no ants crossed the chalk line within 60 minutes. A satisfaction survey among 82 users of the herbal chalk revealed that the top three satisfactions were repellent efficacy (7.83±1.16), overall product satisfaction (7.62±1.32), and ease of use (7.62±1.17), respectively.
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