The Control of Aedes aegypti larvae by Physical Method - การกำจัดลูกน้ำยุงลายโดยวิธีทางกายภาพ

บทคัดย่อ

The purpose of this post-test two-group study was to compare the outcomes of two methods of
breeding preventing of Aedes aegypti larvae in home setting. It was reported that most of the larvae
(70.82%) were found in water tanks or containers such as jars, concrete tanks, water containers in
bath rooms. Two control methods were experimented in two groups. In a control group, a conventional
practice of using larvicide (abate sand granules or temephos) and guppy fish Poecitia reticulata
with lids closed was employed. In an experiment group, larvae control was by continuous wave
movement on its surface with dripping tap water from a faucet. Furthermore, to deter Aedes aegypti
from laying eggs, move sunlight was enhanced by changing some part of ordinary roof covering
material into transparent slate. As such, the heat and light plus physical movement of the water did
not accomodate a reproduction of Aedes aegypti. Each group covered 100 households in the same
village in two separate clusters during January 5 - March 31, 2009 (12 weeks). Data were presented
in frequency and percentage.
It was reported that the physical method was more effective as measured by Container Index
(CI) and Breteau Index (BI). The CI was cut down from 64.49 in the control group to 1.83 in the
experiment group whereas the BI was 69 in the control and 2.00 in the experiment.
It was concluded that the physical method has created unaccommodating environment for
Aedes aegypti and disrupt its lifecycle by a combination of physical mechanisms of water movement,
light and heat. This control measure is recommended as complementary where possible
particularly in rainy season.
Key words: Aedes aegypti larvae, physical methods, control measures