title: Evaluation of Sumithion L-40 against Aedes aegypti (L.) and Aedes albopictus Skuse.
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 240 ml/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.
authors: Agricultural Chemicals (M) Sdn. Bhd., 962, Lrg. Perusahaan 8, Tmn. Perindustrian Perai, 13600 Perai, Pulau Pinang, Malaysia.
authors: S R
authors: SR
authors: Loke
authors: Museum of Zoology, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors: K W
authors: KW
authors: Sing
authors: Medical Entomology Unit, Institute for Medical Research, 50588 Kuala Lumpur, Malaysia.
authors: G N
authors: GN
authors: Teoh
authors: Medical Entomology Unit, Institute for Medical Research, 50588 Kuala Lumpur, Malaysia.
authors: H L
authors: HL
authors: Lee
mesh_terms: D000330:Aedes / Q000187:drug effects*; D000818:Animals; D001681:Biological Assay; D005260:Female; D005278:Fenitrothion / Q000494:pharmacology*; D007306:Insecticides / Q000494:pharmacology*; D007814:Larva / Q000187:drug effects; D016019:Survival Analysis; D013997:Time Factors
chemical_list: D007306:Insecticides; D005278:Fenitrothion