ประสิทธิภาพของเม็ดเกลือเคลือบสารสกัดข่า (Alpinia galanga) ในการกำจัดลูกน้ำยุงลาย

บทคัดย่อ

Mosquitoes are one of the most important public health problems in Thailand,
especially diseases carried with mosquitoes. Preventing and controlling the breeding of
mosquitos’ vectors were still using chemicals for killing mosquito larvae. The objective of this
research was to study the efficiency of the salt tablets coating with Alpinia galanga extract
against Aedes aegypti Larvae. This research was focus to investigate the concentration of Alpinia
galanga extract at 0, 0.5, 1 and 1.5% (w/v) for 24 hours for the duration of action and mortality
rate of Aedes aegypti Larvae for a week, at the 7th day of the salt tablets coating with Alpinia
galanga extract. Data of Dissolved Oxygen (DO), temperature and pH of water were used as
indicator of water quality before - after experiment. The results showed that the concentration
of Alpinia galanga extract at 1.5% could absolutely get rid of Aedes aegypti Larvae. Therefore,
the mortality rate of Aedes aegypti Larvae was 100%. The salt tablets coating with Alpinia
galanga extract against Aedes aegypti Larvae at the concentration of 0.5% Alpinia galanga
extract had been reported that the average of mortality rate of larvae was 94.60%. Moreover,
the average of mortality rate of larvae using salt tablets without coating Alpinia galanga extract
was 46.60%, but no mortality rate of larvae was not observed in control. However data of DO,
temperature and pH of water quality before - after experiment did not exceed the Provincial
Waterworks Authority standards. The findings suggested that the salt tablets coating with
Alpinia galanga extract were toxic to mosquito larvae. It can be developed as an alternative
herbal product to use instead of chemicals for effectively killing mosquito larvae.