Evaluation of Sumithion L-40 against Aedes aegypti (L.) and Aedes albopictus Skuse
- Author:
Loke, S.R
;
Sing, K.W
;
Teoh, G.N
;
Lee, H.L
- Publication Type:Journal Article
- From:Tropical Biomedicine
2015;32(1):76-83
- CountryMalaysia
- Language:English
-
Abstract:
Space spraying of chemical insecticides is still an important mean of controlling
Aedes mosquitoes and dengue transmission. For this purpose, the bioefficacy of space-sprayed
chemical insecticide should be evaluated from time to time. A simulation field trial was
conducted outdoor in an open field and indoor in unoccupied flat units in Kuala Lumpur, to
evaluate the adulticidal and larvicidal effects of Sumithion L-40, a ULV formulation of
fenitrothion. A thermal fogger with a discharge rate of 240ml/min was used to disperse
Sumithion L-40 at 3 different dosages (350 ml/ha, 500 ml/ha, 750 ml/ha) against lab-bred
larvae and adult female Aedes aegypti and Aedes albopictus. An average of more than 80%
adult mortality was achieved for outdoor space spray, and 100% adult mortality for indoor
space spray, in all tested dosages. Outdoor larvicidal effect was noted up to 14 days and 7
days at a dosage of 500 and 750 ml/ha for Ae. aegypti and Ae. albopictus, respectively. Indoor
larvicidal effect was up to 21 days (500 ml/ha) and 14 days (750 ml/ha), respectively, after
spraying with larval mortality > 50% against Ae. aegypti. This study concluded that the
effective dosage of Sumithion L-40 thermally applied against adult Ae. aegypti and Ae.
albopictus indoor and outdoor is 500 and 750 ml/ha. Based on these dosages, effective indoor
spray volume is 0.4 – 0.6 ml/m³. Additional indoor and outdoor larvicidal effect will be observed
at these application dosages, in addition to adult mortality.
INTRODUCTION
Dengue is a serious public health disease in
Malaysia since the first nationwide dengue
outbreak in 1973; the most prevalent vectors
for dengue are Aedes aegypti and Aedes
albopictus (Lee et al., 1997). In the continued
absence of specific treatment and effective
vaccine against dengue virus, dengue control
relies on suppressing Aedes populations
and subsequent interruption of disease
transmission through the use of insecticides,
especially during outbreaks (Esu et al., 2010).
The organophosphate fenitrothion was
applied in space spraying for dengue and
malaria control since 1970s (Samutrapongse
& Pant, 1973; Pant
- Full text:W020150519525852182101.pdf
